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Top 22 best robotic lawn mowers of 2019

ByElina BlomUpdated May 31, 2019

Are you tired of cutting the grass every week and plan to get a robotic lawn mower to do the job instead? We've tested robotic lawn mowers over a whole growing season, and name the Husqvarna Automower 310 as best in test. It runs very well, has a long cutting-time, is easy to set up and very good at problem solving.

Best budget choice is the McCulloch Rob R600, which is a user friendly model that's easy to install, and which cuts grass with panache despite its lower price.

How we did the test

We carry out our tests ourselves and test all products as they are intended to be used in reality. To obtain test results that are as reliable as possible, we have tested the robotic lawn mowers for several months, on several different types of lawns and in different types of weather. This makes it possible to judge long-term effects and seasonal impact.

For example, it's often wet in the autumn but dry in high summer. The grass grows mostly at the start of the summer and the lawn is most brittle during the dryness of high summer and the autumn rains. Testing robotic lawnmowers under all these conditions also gives a better overall picture than simply testing them for a couple of weeks in the early summer - something that is common in other robotic lawn mower tests.

It's also common in other tests to use only one grass area per model, on which the test body artificially tries to include all types of difficulty. However, our experience tells us that it's extremely difficult to succeed with this. Primarily because it's so difficult to predict all of the types of difficulties that different lawns present. So we think that the more types of lawn that a robotic lawn mower is tested on, the better.

In our assessment we have focused on the following characteristics:

  • Performance: How big an area of grass can the robotic lawn mower cope with? How good are the cutting results over the short and long term? How well does it cut long, coarse and wet grass?

  • Effectiveness: How effectively does it work in terms of time and cutting results? How long do you need to spend on the lawn? How often does it have to go out and cut? Can it really cope with the recommended cutting area?

  • Reliability: How intelligent is it? How reliable is it? How often does it stop and report an error message, and in what situations? How good are the robotic lawn mower's terrain-handling abilities? How flexible can the cable laying be for it still to cope? How does the robotic lawn mower avoid wheel tracks along the perimeter wire? How does it cope with narrow passages, sharp corners, areas full of obstacles or secondary areas?

  • Ease of use: Is the installation quick and straightforward or slow and fiddly? Are there clear instructions, such as detailed illustrations or YouTube videos? How easy is the robotic lawn mower to program? Is the menu system easy to navigate? How does the robotic lawn mower communicate with its owner? What type of information does it give? Can it work without disturbing the neighbours?

  • Design & build quality: How well designed is the robotic lawn mower? Do the wheels give a good grip while simultaneously being kind to the lawn? How much stress and wear does the construction tolerate? How tough are the blades? Do the blades give a neat cut or do they tear the grass? What guarantee does it have? Are there spare parts?

  • Functionality What settings are available? How much control does the user have of the cutting schedule? Does the robotic lawn mower have an app?

  • Safety: Does the robotic lawn mower use pivot blades or fixed blades? Does the signal in the perimeter wire interfere with other robotic lawnmowers? Can children or pets get at the blades? How much damage do the blades do, for example to forgotten toys? How effective is the theft protection? What happens if you forget the PIN code, or somebody enters the wrong PIN code?

We have pushed each robotic lawn mower to the limits of what it can cope with to see what types of situations and environments it can handle. Each robotic lawn mower has been given a score according to its value for money; in other words how good it is in each area in relation to its price tag. An expensive model thus has higher expectations than a cheaper one, and vice versa. We noted how often, where and why each robotic lawn mower stopped, and what consequences that had on the cutting result.

1. Husqvarna Automower 310 - BEST ROBOTIC LAWN MOWER

Well-equipped, easy to program and reliable with time-saving solutions

Review year: 2019 Price class: Medium Battery: Type: Lithium ion | Capacity X Ah/X V Operating time: approx. 70 min/charge Max. gradient: approx. 22° (40%) Cutting height: 20-60 mm, 9 step (manual) Cutting width: 22 cm Weight: X kg Noise level: 60 | Measured average value: approx. 59 dB Length: 63 cm Width: 51 cm Height: 25 cm Blade type: Pivoting PIN code protected: Yes App support: Yes (Bluetooth) Accessories included: 9 x blades Miscellaneous: Support for 1 guide cable User manual: PDF

Husqvarna Automower 310 2019

The Husqvarna Automower 310 is our best in test because of its excellent terrain handling and capacity to cope with more complicated gardens. For example, the robotic lawn mower is good at keeping the grass short on both steep slopes and narrow corridors. You don’t need to lay the cable in any special pattern for it to find corridors or other tricky spaces – its AI means it can deal with these on its own.

Getting started with the Automower 310

It doesn’t take long to get the Automower 310 started on a lawn. This is a robotic lawn mower that’s very easy to programme. Either via the display with the clear and easily navigated menu system, or via your mobile phone.

The robotic lawn mower has Bluetooth support, so you can stand up and program it using your telephone without having to stoop down. However, we strongly recommend that you buy Husqvarna’s Automower Connect kit, which links the lawn mower to the mobile network. This means you can monitor and control it from anywhere with mobile connection. There’s also now support for voice control, via Alexa and Google Assistant, and a connection to the Apple Watch.

The robotic lawn mower is very forgiving when it comes to laying the cable, so pretty much anyone can lay the cable themselves as long as they're physically fit and not completely hopeless at DIY.

Copes on its own without needing your input

Once the robotic lawn mower is installed, you can easily adjust the cutting height without needing a tool. Its movement patterns on the lawn means that the robotic lawn mower doesn’t wear tracks in the grass. However, it can slip a little when running over damp slopes if it has cut grass stuck in its wheels.

In tall grass, the 310 does a spiral cutting pattern to make sure the area is trimmed as quickly as possible. The cutting result is excellent. It’s also so quiet that your neighbours won’t notice it.

When the 310 returns home to charge, it travels via the guide cable, which is a kind of short cut so the robotic lawn mower can get home more quickly. This means it avoids obstacles on the way home, which there often are around the perimeter wire. For example, if you have dense, low-hanging bushes or very uneven ground along the edges of the lawn.

The Automower 310 succeeds in maintaining the recommended surface area of 1000 square metres without problems. As mentioned above, we recommend that you buy the Automower Connect kit which means you can control the robotic lawn mower at a distance, as this gives a completely different level of convenience. Even without the kit, however, the 310 is a very good buy, because it’s so easy to install, and it’s excellent terrain-handling ability means that it almost never gets stuck even on a bumpy lawn with pine cones, fallen fruit etc.

Very good terrain handlingVery easy to programIntelligent, very quiet
A little weaker in wet grass on slopes

2. Husqvarna Automower 430X - BEST PREMIUM CHOICE ROBOTIC LAWN MOWER

Intelligent, reliable premium mower for large, difficult lawns

Review year: 2018 Price class: Premium Battery: Type: Lithium-ion | Capacity 5.2 Ah/18 V Operating time: approx. 135 min/charge Rec. max. area: 3200 m² Max. gradient: approx. 24° (45%) Cutting height: 20-60 mm, 9 step (electronic) Cutting width: 24 cm Weight: 13.2 kg Noise level: Low | Measured average value: approx. 57 dB Length: 72.1 cm Width: 55.8 cm Height: 30.8 cm Blade type: Pivoting PIN code protected: Yes Accessories included: Perimeter wire and staples can be purchased separately, 9 pcs extra blades User instructions: PDF Video clip: Installation instructions

Husqvarna Automower 430X 2019

We've made the Husqvarna Automower 430Xour best premium choice because of its many strengths - excellent terrain-handling abilities, a phenomenal problem-solving capacity and lots of intelligent functions.

It's very easy to install as a result of clear markings and a straightforward connection method. The display is a decent size and the interface easy to navigate and get an overview of.

The 430X has no problems with cutting the stated maximum surface area. It doesn't even need to go out cutting often to achieve an excellent result. And it always finds its way home as it has both a guide cable and perimeter wire. It even has a built-in antenna, which means it can nose its way up to the docking station once it's within a couple of metres of it.

Incredibly reliable

Despite the fact that we've run the 430X for several months, on lots of challenging lawns, it never gets stuck. This is due to its industry-leading terrain-handling abilities. It copes with difficulties such as steep gradients, hollows, roots, a loose underlying surface, tall grass, irregular cable laying and lots of obstacles in its way. The only thing that occasionally gives the 430X problems is reversing on steep gradients, particularly on a poor surface.

The lawn mower is also so quiet that you can leave it running at night.

Husqvarna Automower 430X

You're always in control

And the cherry on this particular cake is that the 430X also includes Husqvarna's excellent AMC app. Unlike competitors' apps, AMC gives you complete control over the lawn mower wherever you are as it's connected via the mobile network. This makes it possible, for example, to monitor cutting status, or to change cutting schedule or cutting height while you're away.

The Automower 430X is quite large but can still get through narrow passages, and has no problem finding its way out of more enclosed areas. Unfortunately, the bodywork easily gets scratched, and is damaged after just a few impacts with garden furniture and protruding branches. But this is the only real disadvantage with this robotic lawn mower, and since 2018 it has had a bumper added at the front which protects it to some extent.

If you have a simple, open and perfectly laid lawn there are cheaper alternatives to the 430X. But if you've got a large, difficult lawn, the Husqvarna Automower 430X offers an unbeatable combination of reliability, terrain handling, time efficiency and user-friendliness. And with support for IFFT, you can connect it to your smart home and to Gardena’s Smart Garden system.

Fantastic terrain-handling abilitiesquietquickhigh reliabilityintelligenteasy to program
Easily scratched bodywork

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3. McCulloch Rob R600

Simple budget mower that does its job with panache

Review year: 2018 Price class: Budget Battery: Type: Lithium-ion | Capacity 4.5 Ah/29 V Operating time: approx. 65 min/charge Rec. max. area: 600 m² Max. gradient: approx. 14° (25%) Cutting height: 30-50 mm, 3 step (manual) Cutting width: 17 cm Weight: 7 kg Noise level: 57 | Measured mean value: approx. 58 dB Length: 59 cm Width: 44 cm Height: 26 cm Blade type: Fixed PIN code protected: Yes Accessories included: 150 m perimeter wire | 200 pcs staples | 3 pcs extra blades User manual: PDF Video clip: Installation instructions

McCulloch ROB R600

The McCulloch Rob R600 constitutes a winning combination, with its good terrain-handling abilities and easily programmed interface, and is therefore our best budget choice.

It's a relatively intelligent robotic lawn mower with very good reliability thanks to good design and material choices, and a problem-solving ability that's unbeatable for its price class.

Just like many other smaller robotic lawn mowers, the R600 has three wheels, but here the paired wheels are at the front. This gives it good stability even on more uneven terrain. It can also cope with paving along the perimeter wire without any problem.

The cutting result is good. It's quite narrow, so it takes a while for it to cut the entire area, but on the other hand it lasts for a long time on one charge. On average, it's out cutting for 60 minutes every other hour during the set working hours.

It's also quite a quiet machine.

"Limited" by its guide cable

It can only find its way home via the guide cable, not via the perimeter wire. On models intended for large gardens, a guide cable is a good complement to a system, as it's important to be able to take shortcuts. But on a small, uncomplicated plot, it would often be easier not to have a guide cable, as it becomes something that increases the risk of cable breakage, while the installation also becomes slightly more time-consuming.

On the other hand, it's good that it has the option of a guide cable. But we'd have preferred not to be limited to just this one alternative.

Husqvarna Automower 430X

Easy to program

It's very easy to get set up and program the Rob R600. The display is large and clear. There's a knob on the top to set the cutting height. The knob is protected by a cover, and there's also a narrow display beneath it that shows the chosen setting.

The mower also includes a generous amount of installation material.

The robot doesn't detect its charging station like many more expensive models. This means in practice that it tends to collide with the station when it's out cutting. So you need to anchor it into the ground well and be careful with how you conceal the cables.

Another disadvantage when you're buying in this price class is that the mowers don't have large numbers of functions. In principle, you get what you need so that it can cope with cutting and navigating on the lawn, but no advanced setting options.

Everything simply works

The R600 may be simple, but it has major advantages in that it doesn't get stuck and can take itself out of tricky situations. It has no problems with obstacles on its way home, finding its way out of small, enclosed areas or handling obstacles on the lawn during cutting.

The R600 is best on small to medium-size lawns - even complicated ones - without steep slopes and with a relatively even underlying surface.

User-friendlyeasy to installgood terrain-handling abilitiesreliablegood design
Few functionslimited maximum gradientguide cable not optional

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4. Husqvarna Automower 450X - BEST LUXURY CHOICE ROBOTIC LAWN MOWER

The king of robotic lawn mowers, with unbeatable functionality and performance

Review year: 2018 Price class: Premium Battery: Type: Lithium-ion | Capacity 10.4 Ah/18 V Operating time: approx. 260 min/charge Rec. max. area: v 5000 m² Max. gradient: approx. 24° (45%) Cutting height: 20-60 mm, 9 step (electronic) Cutting width: 24 cm Weight: 13.9 kg Noise level: Low | Measured average value: approx. 58 dB Length: 72.1 cm Width: 55.8 cm Height: 30.8 cm Blade type: Pivoting PIN code protected: Yes Accessories included: Automower Connect, ultrasound sensor, headlight, perimeter wire and staples can be purchased separately, 9 pcs extra blades User manual: PDF Video clip:Installation instructions

Husqvarna Automower 450X 2018

The Husqvarna Automower 450X is a quiet, strong and reliable premium lawn mower with an unusually high cutting capacity. It can cut for several hours at a time without having to go home and recharge.

When it does go home, or out again, it can run along the perimeter wire or guide cable. The guide cable is a kind of shortcut you lay across the garden so that the robotic lawn mower can easily find its way out to and back from specific places. In total, it can deal with three different guide cables, which means significant time savings in large, complicated areas.

It can also detect the charging station when it gets closer to it, by means of a built-in antenna. These features facilitate a quick and safe return home.

Doesn't get stuck However, one of the 450X's foremost strengths is its terrain-handling abilities. It can cope with everything from simple, large and flat lawns with trees and bushes to smaller, divided lawns with corridors between. Hollows in the lawn, undergrowth here and there and lots of fallen fruit pose no problem at all.

When it approaches larger obstacles, it reads these with an ultrasound sensor and slows down so that there are no sudden collisions. This reduces the risk of scratches on the otherwise easily scratched bodywork. It also means that it can keep up a higher speed on open areas than would otherwise have been possible.

The 450X can also cope with steep slopes. It's a little weak at reversing on slopes with gradients above the stated specification, but in general the 450X is very strong. It's only when the slope gets so steep that it's rubbing on the underside of the bodywork that it can't move any further, because it becomes physically impossible.

Keeps you informed

The Automower 450X works very quietly and can even cut the lawn at night. This is when the built-in headlights come in handy, so that you don't trip over the robotic lawn mower in the dark. You can also deactivate these.

The included app is very user-friendly and gives you almost complete control over your 450X wherever you are, provided you have mobile coverage. You can do everything from seeing where the robotic lawn mower is on the lawn in real time to adjusting cutting height and working time at a distance. The app also notifies you if the robotic lawn mower is stolen or gets stuck.

The robotic lawn mower is quite large but can squeeze through quite narrow corridors. For example, 60 cm is no problem.

Overall, this is a reliable, strong robotic lawn mower with lots of functions that's easy to programme both directly and at a distance. It also produces very good cutting results. But it's a luxury machine primarily intended for commercial use, and the price tag reflects this. If we ignore the price, it's quite clearly the best robotic lawn mower on the market.

Unbeatable for time efficiencyreliabilitycutting capacity quieteasy to program
Easily scratched bodywork

5. Husqvarna Automower 315

Intelligent, user-friendly robotic lawn mower that copes with tough terrain

Review year: 2018 Price class: Medium Battery: Type: Lithium-ion | Capacity 2.1 Ah/18 V Operating time: approx. 65 min/charge Rec. max. area: 1500 m² Max. gradient: approx. 14° (25%) Cutting height: 20-60 mm, 9 step (manual) Cutting width: 21 cm Weight: 9.2 kg Noise level: 60 | Measured mean value: approx. 52 dB Length: 63 cm Width: 51 cm Height: 21 cm Blade type: Pivoting PIN code protected: Yes Accessories included: None App support: Yes (Bluetooth) User manual: PDF Video clip: Installation instructions

Husqvarna Automower 315 2019

The Husqvarna Automower 315 is a very good robotic lawn mower that combines great terrain-handling abilities and high reliability with an easily programmed interface and intelligent solutions for navigation.

For example, the charging station sends out a signal that means that, within a 6-metre radius, the robotic lawn mower senses the station and navigates in from different angles each time. This means that it doesn't cause tracks by the entrance.

The guide cable is also a really great addition. If you have a garden with a complicated shape or many work areas, the guide cable means that the robotic lawn mower can easily find its way out and back again. Instead of travelling along the wire right around the edge of the garden, it can take a shortcut. However, we do notice some track creation along the guide cable which doesn't occur when it runs along the perimeter wire.

A very reliable robotic lawn mower

Terrain-handling abilities are exemplary and the Automower 315 pretty much never gets stuck. It can also handle steep slopes, obstacles and paving on or around the lawn with ease.

From a reliability viewpoint, in this price class it's absolutely one of the best robotic lawn mowers on the market.

It's also very quiet and very strong. It can be out cutting for quite a long time. The only disadvantage when it comes to tough terrain is that the bodywork easily gets scratched.

Husqvarna Automower 315

The app is user friendly

The Automower 315 is supplied with app support and the app is very user-friendly. Through this, you can easily change settings such as start points, manual cutting height adjustment and new schedules.

You connect the telephone to the robotic lawn mower via a Bluetooth connection. If you buy the premium version of the lawn mower, the Automower 315X, you also get GPS and connection via the mobile network. Then you can see where the robotic lawn mower is located in real time on a map and change settings wherever you are, provided you have mobile coverage. With the Automower 315, however, you have to be content with changing settings when you're close to the lawn mower. Given the price tag and the app's general excellence, it's still really very good, but perhaps Wi-Fi would have been preferable instead?

The robotic lawn mower is very easy to program even when you're changing the settings directly via the display on the machine body. The display is large and easy to read, and the entire interface is clearly divided up so that even beginners can understand it.

A really good buy

Overall, the Husqvarna Automower 315 is a very good purchase for anyone who wants a reliable and easy to manage robotic lawn mower. It's suitable for everything from simple, landscaped lawns to the uneven, complicated variants with several different cutting areas. However, the Automower 315 is best value for money on trickier lawns where it can really show what it can do.

Intelligenttime efficientreliableexcellent terrain-handling abilitiesquieteasy to programmeexcellent app
Easily scratched bodywork

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6. Husqvarna Automower 550

Reliable for public environments

Review year: 2019 Price class: Premium Battery: Type: Lithium-ion | Capacity 10.4 Ah/18 V Operating time: approx. 260 mins/charge Rec. max. area: 5000 m² Max. gradient: approx. 24° (45%) Cutting height: 20-60 mm, 9 step (electronic) Cutting width: 24 cm Weight: 13.9 kg Noise level: Low | Measured average value: approx. 59 dB Length: 72 cm Width: 56 cm Height: 31 cm Blade type: Pivoting PIN code protected: Yes Accessories included: Automower Connect, 9 extra blades

Husqvarna Automower 550 2018

The Husqvarna Automower 550 stands out from the crowd in that it lacks a display. The idea is that nobody without authorisation should be able to change settings. Instead, it’s completely controlled via an app on your mobile phone. If you have a whole fleet of 550s, you can keep track of them via Husqvarna Fleet Service, which is available for both computers and mobile phones.

In general, it’s very similar to its sibling, the Automower 450X. Pretty much everything we like about that luxury model is here too: The ultrasound sensor makes it possible for the lawn mower to run more quickly over open spaces and slow down when it approaches an obstacle, the GPS navigation that means it cuts evenly all over open spaces and doesn’t forget some areas, and three guide cables so that it can quickly find its way home.

The installation process is easy if you have dealt with robotic lawn mowers before. But if you’re a beginner, it isn’t entirely clear how to get started given that there’s no display. It is more difficult than it is on the 450X, for example. On the other hand, private individuals aren’t the intended target group for the Automower 550.

Minimal maintenance

The mower’s terrain handling capacities are excellent. It can cope with steep slopes, damp grass and uneven lawns. If you have a park-like lawn, you’ll also want it to be able to cope with pine cones, fallen fruit and so on – which it does with panache. The mower is so reliable that it only gets stuck once during our several month long test period. And even then the circumstances were extreme – a fallen tree it got stuck beneath.

The Automower 550 is very quiet. The wheels stay clean of grass residues and dirt – you simply have to brush them off a few times a month.

Thanks to the very generous battery life, the Automower 550 has an enormous cutting capacity. Even if Husqvarna themselves don’t actually say as much, we estimate its actual maximum capacity as almost a whole hectare. But despite such an impressive cutting capacity, the Automower 550 has a very moderate weight. But it's still quite heavy to carry. To minimise the risk of theft, you can use Fleet Service to see exactly where your robotic lawn mower is at any time, and you get notifications via the app if it leaves its designated area.

This is a fantastically competent robotic lawn mower, but the price tag reflects this. But the Automower 550 is also intended for public environments such as parks. For the average homeowner with a very large lawn (around 5000 m2), the sibling model Automower 450X is a somewhat cheaper alternative. Above all, the 450X has a display, which makes it a bit easy for a private individual to understand.

For park keepers, however, this model is exemplary. As far as we know there are currently no other professional models that perform as well as this in terms of reliability. The commercial interface is also very good.

Very good terrain-handling abilitiesExtremely high reliability & cutting capacityGood speed control
Quite heavyNot as easy to install as other Husqvarna models

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7. Honda Miimo 310

Reliable, strong robotic lawn mower in medium price class

Review year: 2018 Price class: Medium Battery: Type: Lithium-ion | Capacity 1.8 Ah/22.2 V Operating time: approx. 40 min/charge Rec. max. area: 1500 m² Max. gradient: 20° (37%) Cutting height: 20-60 mm Cutting width: 22 cm Weight: 11.6 kg Noise level: Average Length: 64.5 cm Width: 55 cm Height: 28.7 cm Blade type: Pivoting PIN code protected: Yes Accessories included: 200 m perimeter wire, 200 pcs staples, 9 pcs extra blades App support: No User manual: Quick guides Video clip: Demo

Honda Miimo 310

The Honda Miimo 310 is a user-friendly robotic lawn mower in the medium price class, with very good terrain-handling abilities and a reasonable cutting time. In fact its terrain-handling abilities are one of its biggest advantages. It easily copes with different types of surfaces, deals with obstacles in an intelligent manner and manages pits and slopes with excellent results.

The fact that it can also cut tall grass in an exemplary manner reinforces this impression still further. The taller the grass, the slower it creeps along. It can pretty much stand completely still and cut until the grass reaches the desired length, which almost no other robotic lawn mowers can do.

On the few occasions that it still managed to get stuck during the several month long test period, we discovered that it was prone to digging itself downwards in its attempts to get free, which can damage the lawn.

Honda Miimo 310

Doesn't cut for long

We clocked the cutting time as around 40 minutes, and after this it has to charge for about as long again before it can go back to cutting. This is OK, but not great. When it's cutting, the noise level is also OK, but if we were to be really fussy it's a bit on the shrill side.

The menu system is clear and it's easy to change settings. The installation could be more straightforward. Cable connectors make it easy to connect the cable, but the space behind is cramped and the connections aren't positioned in a user-friendly manner. It's not obvious which end of the perimeter wire should be connected where, and you can't really see what you're doing because of the cramped space. Despite this minor inconvenience, the installation is still manageable for a beginner. When everything is in place, the actual programming is simple.

Finding the way home, and movement patterns

The Miimo 310 is usually very intelligent. It gets itself out of all the difficult situations we test it with, such as small, enclosed spaces and obstacles along the route home. However, once it gets near home it slavishly carries out a single movement pattern every time. So during the spring, autumn and in rainy summers it can easily create tracks in the lawn right by the entrance. However, there are no problems with tracks forming along the perimeter wire.

The charging station is installed along the perimeter wire and can be sensitive in terms of positioning. If the angle is off by just a few degrees, it can have problems docking.

When the charging station is correctly positioned, it never has any problems getting in, either when it comes directly towards the opening or from behind so it has to move around the station first.

With everything properly installed and tested, reliability is extremely high. It almost never gets stuck, it's easy to adjust the cutting height and it always finds its way home. As it can also cope with tall grass with such panache, we can truly recommend this robotic lawn mower for simple, medium hard and difficult lawns of average size.

Very strong excellent terrain-handling abilities high reliabilityclear interface
Slightly shrilldigs itself downwards if it gets stuckslavish adherence to movement pattern in front of charging station

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8. McCulloch ROB R1000

Reliable, easy to program and quite intelligent

Review year: 2019 Price class: Budget Battery: Type: Lithium ion | Capacity 4.5 Ah/29 V Operating time: approx. 65 min/charge Rec. max. area: 1000 m² Max. gradient: approx. 14° (25%) Cutting height: 30-50 mm, 3 step (manual) Cutting width: 17 cm Weight: 7 kg Noise level: 57 | Measured average value: approx. 58 dB Length: 59 cm Width: 44 cm Height: 26 cm Blade type: Fixed PIN code protected: Yes Accessories included: 150 m perimeter wire & 200 staples, 3 blades

McCulloch ROB R1000

The McCulloch ROB R1000 is a reliable, budget class robotic lawn mower intended for medium-sized and relatively simple lawns. Like many budget models, it has few setting options and lacks app support. But more importantly, it’s intelligent and able to cope with challenges that many other budget models fail to overcome.

For example, the R1000 has no problems getting around obstacles on its way home or sparing toys that have been left out on the lawn. Nor are uneven lawns a problem. However, the R1000 does struggle with slopes when the grass is damp, and it often struggles to get a grip and slips about. In the worst case, it causes damage to the lawn. At the same time, the loan doesn’t weigh very much, so when it slips it very rarely causes visible damage. Unfortunately, it has no rain sensor which could have otherwise alleviated the problem.

The cutting width is minimal, given the recommended cutting area. This means that the R1000 has to be out cutting often if it is to cope with the stated 1000 m². The guide cable often reduces the time it takes for the robotic lawn mower to find its way home. But it’s a shame it can’t also go home along the perimeter wire, as the quickest way isn’t always via the guide cable.

The Rob R1000 is quiet and good at coping with normal length grass. It tends to protest in tall grass and try to cut somewhere else. In other words, it doesn’t understand that it needs to creep slowly forwards to graze the grass down before it grows even taller.

Very easy to install for the ordinary user

One advantage with the McCulloch Rob R1000 is that the package includes insulation material that means you don’t need to buy extra products to get the robotic lawn mower going with each new installation.

The installation process is pretty much the same as for every other robotic lawn mower with the difference that you also have to connect in a guide cable. This is very easy and the connections are clearly marked on the charging station. The programming process is very fast. The interface is clear and it’s very easy to understand the robotic lawn mower’s functions. However, the range of functions is rather minimal.

Could do more

The R1000’s little sister, the Rob R600, got a slightly higher score in our test. In this size class, the cutting width and operating time are enough for it to be able to keep the lawn in trim without having to be out cutting all day long. But the Rob R1000 needs to be beefed up a bit to be really good at dealing with the manufacturer’s recommended cutting area.

That said, this isn’t a bad robotic lawn mower. It produces a good cutting result, is easy to install and just as easy to program. It’s just a little too basic compared to its competition in this price class.

Very easy to use & installRelatively intelligentReliableGood cutting resultQuiet
Narrow cutting widthFew functionsStruggles with slopes on damp grass

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9. Gardena R100Li Sileno

Straightforward and silent for medium-large gardens

Review year: 2018 Price class: Medium Battery: Type: Lithium-ion | Capacity 4.5 Ah/29 V Operating time: approx. 65 min/charge Rec. max. area: 1000 m² Max. gradient: 35% Cutting height: 20-60 mm, (manual) Cutting width: 22 cm Weight: 8.5 kg Noise level: 56 dB | Measured average value: approx. 54 dB Length: 630 cm Width: 510 cm Height: 250 cm Blade type: Pivoting PIN code protected: Yes Accessories included: 200 m perimeter wire & 400 staples, 9 blades App support: No User manual: PDF *Video clip: Installation instructions

Gardena Sileno R100Li

The Gardena R100Li Sileno is a user-friendly robotic lawn mower that's easy to install. It includes plenty of useful installation material. It's also quiet, which is an advantage in built-up areas.

But for some reason, it can only find its way home via the guide cable, not via the perimeter wire. This makes no difference in practical terms as long as you have installed the guide cable so that it reaches the entire cutting area. But if you haven't, it may not find the guide cable in time and will end up sitting in the middle of the lawn.

The fact that it can't also use the perimeter wire seems an unnecessary dumbing down of an otherwise intelligent lawn mower.

Nor does it have a rain sensor.

It mows for about 40 minutes at a time, which is shorter than what is stated in the specification. But this is pretty standard for the price class.

Easy to program**

Programming the R100Li Sileno is straightforward, thanks to an easily legible display with clear menu choices. It also copes well with slopes and uneven terrain. However, you need to watch out for protruding branches and other obstacles, because the bodywork is easily scratched.

The R100Li can be classified as normal in terms of strength - there are both stronger and weaker robotic lawn mowers in roughly the same price class. If you have a lawn with thick grass that has grown a bit, you'll need to cut it with a traditional lawn mower first. Otherwise the RL100Li will go on strike.

There's a lot that this robotic lawn mower does well, but nothing that makes it unique among its competitors. This means that it feels rather uninspiring, despite actually being a good buy. For example, it's more competent than an average robotic lawn mower in this price class. But at the same time there are other models that have more functions, are built from better quality materials and handle tougher terrain for about the same price.

The R100Li Sileno is nevertheless a good buy for anyone who has a normal-sized lawn with light to medium difficulty terrain and who's looking for a neat robotic lawn mower in terms of size.

Reliablequiet easy to programincludes lots of installation material
Bodywork easily scratchedcan only find its way home using the guide cable,no rain sensor

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10. Honda Miimo HRM 3000

A reliable powerhouse that can cope with tough conditions

Review year: 2018 Price class: Premium Battery: Type: Lithium-ion | Capacity 5.4 Ah/22.2 V Operating time: approx.90 min/charge Rec. max. area: 4000 m² Max. gradient: 25° (47%) Cutting height: 20-60 mm Cutting width: 22 cm Weight: 13.8 kg Noise level: 59 dB | Measured average value: approx. 61 dB Length: 710 cm Width: 550 cm Height:301 cm Blade type: Pivoting PIN code protected: Yes Accessories included: 9 extra blades App support: Yes (Bluetooth)

Honda Miimo 3000

The Honda Miimo HRM 3000 is a very competent and powerful robotic lawn mower. It takes itself up steep slopes without problems, navigates tight spaces and deals with undulating terrain perfectly.

One of its most positive characteristics is how well it deals with tall grass. It moves slowly but surely over the most densely grown parts where many other robotic lawn mowers wouldn't have a chance. It can pretty much stand completely still and cut if necessary when the grass is tall. The end result is even and neat.

Few reliability issues

The Miimo 3000 is also extremely reliable. Once it's got used to an area - in other words, after you've fixed any obstacles - it can run for months without problems.

However, if the Miimo 3000 does get stuck, it has a tendency to dig itself into the lawn. We would have preferred it to quickly realise the situation and shut itself down to save on batteries and protect the lawn. But perhaps it's also partly this function that means it so rarely gets stuck.

Too expensive for just Bluetooth

The Miimo 3000 has app support via Bluetooth connection. This means in practice that within a 10-metre radius of the robotic lawn mower, you can adjust things like its schedule. The interface is easy to navigate and the range of functions is very good.

However, we would have appreciated a GSM connection, given the price class. This would have given you the option to control the lawn mower at distance, for example providing information if it were to get stuck. It feels rather stingy that this is missing, given the price.

And in terms of noise, quieter cutting would have been nicer. The noise level isn't high exactly, but the noise profile when it cuts is quite shrill.

If the Miimo 3000 had been a bit cheaper, we'd have been more lenient, but our demands for premium class models are very high.

Easy to program

However, in terms of intelligence it's very good. It navigates easily through both small areas with obstacles and open spaces. A garden constantly changes with bushes growing, falling branches and fruit etc. The Miimo 3000 has no problem with any of this.

It's also very easy to program. The interface has plenty of functions but is also cleverly planned so that you can easily find what you're looking for. Text and buttons are large and clear. You can also adjust the cutting height electronically.

Compared to its smaller sibling, the 310, you have a relatively free hand in positioning the charging station. However, it's still quite sensitive to begin with, and you have to find the right position to avoid causing problems. Once you've done this, however, docking is problem-free.

The Miimo 3000 is a clearly premium lawn mower that's idea for large, difficult and complicated lawns, where it does an impressively good job.

Very strong and reliableuser-friendly interface intelligent
Rather shrilleasily digs itself into the lawn if it gets stuck

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11. Honda Miimo 520

Reliable, accurate Japanese model for larger lawns

Review year: 2016 Price class: Premium Battery: Type: Li | Capacity 3.6 Ah/22.2 V Operating time: approx. 90 mins/charge Rec. max. area: 3000 m² Max. gradient: 24° (45%) Cutting height:20-60 mm Cutting width: 22 cm Weight: 11.9 k Noise level: Very low Dimensions (WxHxD): 64.5x55x27.5 cm Blade type: Pivoting PIN code protected: Yes Accessories included: 300 m perimeter wire, 300 pcs staples, 9 pcs extra blades

Honda Miimo 520

The Japanese manufacturer is a relatively late arrival to the robotic lawn mower industry, despite its well known love of robots. However, in just a few years Honda's premium robotic lawn mower, Miimo, has developed into one of the best on the market. There are two versions – designated 310 and 520 – which are practically identical except for the battery capacity and a couple of software details.

The Honda Miimo feels very Japanese in a number of ways, the most obvious – apart from the name – being the well conceived design. The build quality is very high and shock absorption means that the Miimo is extremely quiet and makes it appear to be floating discreetly above the grass. The noise level is so low that you can actually use it to cut the grass at night.

High levels of safety built in Programming is straightforward as the menu system is relatively easy to navigate, while still having many setting options. The display is illuminated, although unfortunately the keypad is not.

Safety is excellent, with well protected pivot blades and an easily accessible STOP button.

The Miimo is now one of the most reliable robotic lawn mowers on the market and rarely gets stuck even in more difficult gardens. Only the most challenging lawns will give it problems.

Often kind on lawns The cutting result is very even and neat, not least because the Miimo effectively adapts its speed to the resistance it encounters, slowing down for areas such as taller grass.

Installation of the base station has been simplified compared to earlier, but is still unnecessarily complicated. All installation is generally carried out by Honda's authorised dealers.

High build qualityhigh safety levelsquiet and discreetreliable
Slightly fiddly installation of the base station

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Lawnmowers Direct

12. Gardena Sileno City

Neat garden assistant with a great future

Review year: 2019 Price class: Medium Battery: Type: Lithium ion | Capacity X Ah/X V Operating time: approx. 65 min/charge Rec. max. area: 250 m² Max. gradient: 25 % Cutting height: 20-50 mm, (manual) Cutting width: 16 cm Weight: X kg Noise level: 59 dB | Measured mean value: approx. 58 dB Length: X cm Width: X cm Height: X cm Blade type: Pivoting PIN code protected: Yes Accessories included: Gateway, 150 m perimeter wire, 200 staples, 9 blades App support: Yes (WiFi) User manual: PDF Video clip: Installation instructions

Gardena Sileno City 250

The Gardena Sileno City is a very reliable robotic lawn mower that’s very easy to install and program. As long as the grass is kept short, it pretty much never gets stuck. However, if the grass has grown a few centimetres, it has problems finding its way home. In fact, it's chassis is so sensitive to impacts on the way home that it can even get put off by a primrose plant. If the grass is long around the guide cable (a patented shortcut cable allowing the lawn mower to find its way home), it will have difficulty finding its way before the battery runs out.

But if you've cut the grass thoroughly when you install it – and set it to run often enough that the lawn stays short – you’ll have no problems with reliability. For example, it's good at dealing with pits, damp grass and sloping lawns. It’s also pretty good in terms of strength when it comes to cutting slightly taller grass.

Unfortunately it doesn’t have a spiral cutting function in tall grass, so it isn’t as quick as other robotic lawn mowers at trimming areas with clumps of grass.

The smart garden

The Gardena Sileno City has app support in the form of connection to a router that in turn supports other smart garden gadgets, such as sensors that detect whether the garden needs watering. This is a good idea on paper, but unfortunately the development process hasn’t actually gone very far yet. The range of functions for the robotic lawn mower is very poor – you can essentially only start the machine and set the working area. In the future the system may bring advantages such as all of your intelligent garden gadgets collaborating and communicating without you having to get involved at all – but that remains to be seen.

However, programming via the LCD display on the robotic lawn mower is very simple. The menu system is well designed and clear, the display has good contrast and works even in sunlight.

The Sileno City is suitable for those with a small to medium garden looking for a low price but reliable robotic lawn mower with app support – and ideally someone planning for a smart garden in the future.

High reliabilityEasy installationVery easy to program via the display
Less good in tall grass app support requires a separate router

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13. Robomow RS 635 PRO

Mammoth machine with generous cutting width for open areas

Review year: 2019 Price class: Premium Battery: Type: Lithium-ion | Capacity 6 Ah/26 V Operating time: approx. 90 min/charge Rec. max. area: 3,600 m² Max. gradient: approx. 20° (36%) Cutting height: 20-80 mm Cutting width: 56 cm Weight: 20.2 kg Noise level: Medium | Measured average value: approx. 65 dB Length: 73.5 cm Width: 66 cm Height: 31 cm Blade type: 2 fixed blades PIN code protected: Yes Accessories included: X User manual: PDF Video clip:

Robomow RS635 Pro S

The Robomow RS 635 PRO is a large robotic lawn mower that’s best at wide-open spaces with few corridors. It has two fixed blades underneath and a very broad cutting width. At the same time, it’s speed over open spaces is very good, so you get an efficient robotic lawn mower in the 635 PRO. Even on our large lawns of around 3500 m2, it copes with keeping the lawn trimmed without having to be out the whole day.

However, it doesn’t cut for very long before it needs to be charged – at least given its price class. But it does still cope with the recommended area, so ultimately this isn’t important.

A veritable steamroller with good blades

The build quality is substantial. At the same time, the design is more reminiscent of a tank than a modern robotic lawn mower. It also weighs a lot, which contributes to the tank impression. The hard lines, together with the old-fashioned and minimal interface on the yellowish display means that it just doesn’t feel modern or very user-friendly.

Nor is the installation process entirely clear. You have to guess which end of the perimeter wire goes in which connection, and it takes a while before the charging station reacts and tells you whether you’ve made the right choice. If you’ve picked the wrong one, you have to use a screwdriver to get the wire out again and change it round.

On the other hand, you can program the robot via a very easy-to-use app Once you’ve set the working hours and cutting area, it cuts it very efficiently. The cutting result is excellent and the blades last and entire season despite quite a lot of pine cones and roots on some of the test lawns.

Sometimes escapes from the work area

The terrain-handling abilities are good and we have no problems with it getting stuck in normal conditions. However, the RS 635 PRO isn’t suitable for complicated surfaces with narrow passages and steep slopes. But it doesn’t notice if the lawn is a bit bumpy or if it’s been raining – it simply carries on.

Perhaps the biggest weakness of the RS 635 PRO is that three or four times a season it runs outside the work area and comes to a stop. We can’t see that this has anything to do with the terrain. The mower switches itself off, but not immediately – which means some damage to plants in the flowerbeds. But you don’t need to carry it all the way back to the charging station, because it switches off after a while and saves the battery. You simply lift it back into the cutting area and start it going again.

If Robomow succeed in stopping the lawn mower from escaping, this is an efficient and relatively fast robotic lawn mower for open spaces. It has enough intelligence to cope with various everyday challenges. It has a tendency to crash into things quite hard, but there are no problems with sensitivity as such. The fact that it’s a bit clumsy and without finesse doesn’t matter if you have a large, open lawn.

  • More of an efficient steam roller than a cut diamond
  • Cuts open areas quickly, but not very neat and sometimes escapes
  • Suitable for anyone with a very large, open lawn without sensitive flowerbeds.
Very good cutting widthEfficient cuttingGood quality bladesGood terrain handling
Sometimes escapesOld-fashioned technical choicesUnnecessarily complicated installation

14. Husqvarna Automower 105

Small, quiet and reliable budget class model

Review year: 2017 Price class: Medium Battery: Type: Lithium-ion | Capacity 1.6 Ah/18 V Operating time: approx. 70 mins/charge Rec. max. area: 600 m² Max. gradient: 14° (25%) Cutting height: 20-50 mm, stepless knob Cutting width: 17 cm Weight: 6.8 kg Noise level: Very low Measured average value: 55 dB Length: 55 cm Width: 39 cm Height: 25 cm Blade type: Pivoting PIN code protected: Yes Accessories included: 200 m perimeter wire | 200 pcs staples | 9 pcs extra blades

Husqvarna Automower 105 2019

The Automower 105 is one of Husqvarna's cheapest robotic lawn mowers, with a price in the upper budget class. In many ways it's like the Gardena R50Li, which is also manufactured by Husqvarna.

Husqvarna's industry-leading AI makes the Automower 105 extremely intelligent. It resolves difficult situations easily, which makes it reliable for a budget class model.

The maximum gradient is in fact slightly higher than that stated in the specifications but still moderate.

Not as reliable as its big brother

The small size and low machine weight makes the robotic lawn mower easy to move but at the same time also leads to clearly limited terrain-handling abilities and a minimal cutting width. This makes cutting slow and if the area to be cut includes problematic surfaces such as large surface roots, the robotic lawn mower easily runs into problems and gets stuck.

However, it is quiet and can therefore be used to advantage at night without disturbing the neighbours. Mowing the lawn at night means that you get to use it yourself during the daytime.

Safety levels are excellent. It's almost impossible to get at the pivot blades without the lifting sensor stopping them, but if someone does succeed the blades have such a small amount of power that injuries will be limited. Forgotten toys aren't cut into shreds, but are instead thrown out of the way bearing the odd dent.

Easy to install

Installing the Automower 105 with its base station and perimeter wire is relatively straightforward. Husqvarna's patented guide cable is a really clever innovation that can save a great deal of time on more complicated lawns. However, on the simplest lawns this function is unnecessary, but you still have to install the guide cable - which feels a bit over the top. Programming is simple with an easily navigated menu system and a clear user manual.

The Automower 105 is reasonably priced in relation to its performance and represents a reliable investment for small and medium-sized lawns without major gradients and with a uniform surface.

*We have tested the Husqvarna Automower 105's predecessor - the 308. The models are identical except that the 308 has a recommended cutting area of 800 m², compared with the 105's 600 m².

Intelligentreliablequiethigh safety levels easily programmedclear user instructions
Limited maximum gradientguide cable not optionalrequires uniform surfaces

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15. Robomow RC 308 PRO

Moves well across uneven terrain

Review year: 2019 Price class: Medium Battery: Type: Lithium ion | Capacity 3 Ah/26 V Operating time: approx. 60-70 min/charge Rec. max. area: 800 m² Max. gradient: approx. 20° (36%) Cutting height: 15-60 mm (manual) Cutting width: 28 cm Weight: 11.4 kg Noise level: 64 | Measured average value: approx. 61 dB Length: 63 cm Width: 46 cm Height: 21 cm Blade type: Fixed PIN code protected: Yes App support: Yes (Bluetooth) Accessories included: Perimeter wire & staples

Robomow RC308U

The Robomow RC 308 PRO is a compact robotic lawn mower that has no problems finding its way home or getting out to cut the lawn. It isn’t particularly sensitive to the charging station’s position. And the power cable is unusually long, so you have plenty of opportunities to find a good position for it.

The robotic lawn mower is heavy, which is probably one of the reasons why it easily digs itself into the ground if it gets stuck. But on the other hand, it gets stuck very rarely. It can cope with everything from roots to pine cones, banks and other tricky obstacles. It can even take itself onto a small ledge.

However, one negative point regarding reliability is that the 308 PRO sometimes reverses over the perimeter wire. This happens a couple of times during the season and it just comes to a stop. It doesn’t happen after a steep slope, but on a flat surface and in different places on several different lawns. And always backwards. On one occasion, it goes so far outside the perimeter wire that it cuts off its own charging station’s power cable.

Fiddly installation

Unfortunately, the installation process is really very fiddly – at least if you do it via the robotic lawn’s built-in display. To begin with, it isn’t entirely clear which end of the wire should go into which hole on the back of the charging station. This means there is a 50% chance that you’ll get an error message.

And if you do get one, it isn’t easy to understand what it means. Partly because the display is very small, but primarily because you only get a cryptic number code. If you’re lucky, you can look up the error code in the manual – but unfortunately quite a few error codes aren’t listed and you have to contact support. In other words, the interface and charging station need to be clarified, not least in terms of programming and troubleshooting.

However, there’s an app and using this makes the ongoing programming much easier. So both we and the manual recommend you do the installation via the app instead.

Cuts your whole lawn while you’re at work

Once you’ve got the RC308 PRO going, it’s relatively reliable and, as mentioned above, has very good terrain-handling abilities. It solves problems very well, apart from in restricted spaces where it can sometimes have problems finding its way out.

The RC 308 PRO can be out cutting for quite a long time. In combination with the very wide cutting width, it can mow large areas in a relatively short time. It has no problems cutting the stated recommended maximum size of lawn. This means you have plenty of time over to enjoy your lawn when you come home from work.

The robotic lawn mower isn’t the most powerful we’ve tested, and it’s a good idea to avoid trying to cut tall grass with it. But if you let it keep the lawn well trimmed, this won’t pose a problem. It has a reasonable amount of strength given its price class.

The Robomow RC 308 PRO is one of the market’s more competent robotic lawn mowers. It’s complicated for a layman to install compared to several of its competitors. Once installed, however, it’s relatively reliable and has plenty of functions and a long cutting time. So given its price class, it’s good value for money.

Good at handling complex terrainGood appGenerous cutting widthLong operating time
Unclear interfaceFiddly installationescapes on a couple of occasions

16. Stihl iMow MI 422

Neat, easily programmed robotic lawn mower with fixed blades

Review year: 2018 Price class: Premium Battery: Type: Lithium-ion | Capacity 2.25 Ah/18 V Operating time:approx. 30 min/charge Rec. max. area: 500 m² Max. gradient:approx. 19° (35%) Cutting height: 20-60 mm, 15 step Cutting width: 20 cm Weight: 9 kg Noise level: 60 Db Length: 60 cm Width: 43 cm Height: 27 cm Blade type: Fixed PIN code protected: Yes Accessories included: No App support: No User manual: PDF Video clip: Installation Instruction

The Stihl iMow MI 422 is a small and neat robotic lawn mower that produces a very good mowing result. It's easy to set up, but unfortunately the charging station hasn't been very well designed and you end up with a good bit of dead space around it that you have to cut with a strimmer.

The first time you start the MI 422, it travels around the garden on its own to work out how big it is. This is a useful function for anyone who can't calculate the exact size of their garden. It also gives a good overview of whether or not the perimeter wire is well placed in terms of bringing the lawn mower home - you can see immediately if something needs adjusting.

Based on the results of this trip, the lawn mower suggests a cutting schedule, which of course you can then adapt to your own preferences.

Lots of power in the blade motor

The fixed blades are excellent and cope with mowing even in quite heavy terrain. When the lawn mower can no longer cope with mowing, it turns off the blades and tries a little further on. This means that it tends to drive over tall grass rather than cutting it down. On the other hand, this rarely happens.

But the cutting result is however very even and neat. The blades also stay sharp for a very long time.

Poor reliability

However, the MI 422 gets stuck very easily, not least because it requires a very level cutting surface. Just a slight undulation in the lawn means it gets stuck. Sometimes you can't even see anything it can have got stuck on.

Equally, the MI 422 struggles when it's damp out as it easily slips and digs itself down it into the lawn. Fortunately it realises this and turns itself off instead of standing still and wasting the battery until it dies.

This robotic lawn mower also has problems with steeper slopes as it can get unbalanced, assumes it’s being lifted up and comes to a stop.

The MI 422 has a user-friendly and easily navigated menu system in which you can easily set a schedule for it. There's also a "mow now" quick command that's particularly useful when it hasn't been mowing for a while and needs to catch up.

Normally, the MI 422's cutting time is a reasonable 40 minutes, which is slightly more than what Viking promise. However, if it's not been out mowing for a while and the grass has grown this reduces the cutting time to the promised 30 minutes. We think this is a bit on the short side.

Rather sensitive to different surfaces

The tyres are very smooth and hard, which means that the robotic lawn mower finds it difficult to deal with surfaces other than plain grass. For example, if you have paving, you need to make sure that the mower doesn't partially climb onto it while mowing, because it can easily start digging itself into the lawn.

Another disadvantage is that it's very sensitive to the positioning of the charging station and can't always find its way in if this isn't perfectly positioned. We would have liked it to be quieter when mowing too.

However, it's strong as an ox given the price class.

However, it's strong as an ox given the price class. If you have a manicure and relatively flat lawn, the Stihl iMow MI 422 will cope with it. And if you also want app support, you should choose the Stihl iMow MI 422PC.

The Stihl iMow MI 422 is best on smaller, manicured and very even lawns.

*The Stihl iMow MI 422 's sister model, the Viking iMow 422C, has app support.

Copes with tall grassuser-friendly programmingquite intelligent
Poor terrain-handling abilitiessensitive to docking station position

17. Viking iMow MI 632

User-friendly robotic lawn mower for level areas

Review year: 2018 Price class: Premium Battery: Type: Lithium-ion | Capacity 4.5 Ah/29 V Operating time: approx. 90 min/charge Rec. max. area: 3000 m² Max. gradient: approx. 24° (45%) Cutting height: 20-60 mm, 15 step (manual) Cutting width: 28 cm Weight: 13 kg Length: 73 cm Width: 54 cm Height: 27 cm Blade type: Fixed PIN code protected: Yes Accessories included: No App support: No User manual: PDF Video clip: Installation guide

Viking iMow MI 632

The Viking iMow MI 632 is a large and user-friendly robotic lawn mower for level lawns. It has fixed blades and a strong motor that means it can cut even tall and thick grass without problems. If this robotic lawn mower had better terrain-handling abilities, it would have impressed us. Unfortunately, even moderate unevenness in the lawn means that the MI 632 gets stuck.

It also has difficulties handling surfaces other than grass - probably because of the smooth wheels. For example, if you have paving in the garden, the robotic lawn mower can get into difficulties if it has to run partly on this to trim edges. But if you have a simple, completely flat and even lawn, the MI 632 has no problems. And if the lawn grows a little too much it's quite capable of catching up with the mowing.

Easy to get started

The Garden iMow MI 632 is very easy to install. It has a programme that means it first trundles out around the perimeter wire and calculates how big the garden is. It then suggests a cutting programme that you can adapt based on your own needs.

Programming is carried out via a large display with easily legible text and well-designed menus, and via large, clear buttons. It has many functions, but we'd have liked to see app support. An app should be a given in this price class.

It has no difficulties navigating through the garden or finding different work areas. It also easily extricates itself from narrow spaces or situations such as fallen branches on its route home.

Overall, the MI 632 feels well programmed. But given the high price tag, we'd have expected even better cutting results.

Requires a manicured lawn

The Viking iMow MI 632 is primarily suitable for slightly larger but simple lawns without slopes or hollows. If the lawn is manicured and even, it will do an excellent job, and it's easy to programme and intelligent.

The Viking iMow 632's sister model, the Viking iMow 632C, has app support.

Easily programmedgood cutting resultcopes with tall grass
Limited terrain-handling abilitiesno app support

18. Wolf Garten Loopo S300

Easy to use, with an app for the smaller garden

Review year: 2019 Price class: Budget Battery: Type: Lithium ion | Capacity 7 Ah/12 V Operating time: approx. 90 -120 min/charge Rec. max. area: 200 m² Max. gradient: approx. 8.5° (15%) Cutting height: 15-45 mm (manual) Cutting width: 18 cm Weight: 11.5 kg Noise level: 64 | Measured mean value: approx. 58 dB Length: 53 cm Width: 42 cm Height: 26 cm Blade type: Fixed PIN code protected: No (no display, only child protection in button form) Accessories included: Installation material App support: Yes (Bluetooth)

Wolf-Garten Loopo S150

The Wolf Garten Loopo S300 is a small, handy, robotic lawn mower that’s easy to install – particularly once you’ve downloaded the app to your telephone. You pretty much only have to connect the perimeter wire and press Go on the mower’s housing. If you get an error code, the station will flash. This is when it’s important that you have the app installed because you can quickly discover what’s gone wrong.

Because it connects via Bluetooth, it’s a relatively quick and easy process to link the mobile and lawn mower. So despite the fact that the Loopo S300 has no display, it’s very easy to get started with. However, one major disadvantage is that you can only choose between allowing it to cut the grass 24 as a day, or having a single start time per day when it cuts for either 30, 60 or 90 minutes. There’s nothing in between where you can set both the start and stop time, which is very limiting.

However, the app is easy to use, if slightly minimalist in terms of functions.

Not very intelligent, but easy to use

The Loopo S300 isn’t particularly strong. This becomes clear when it struggles even with grass only 10 cm tall – despite its narrow cutting width. If cutting gets too much for it, it switches off the blades and moves forward a bit before continuing to cut. Nor is there any spiral cutting or similar pattern that means it goes directly to places where the grass has grown a bit taller.

The design of the Wolf Garten Loopo S300 is user-friendly, with large buttons and clear symbols. But from a cutting point of view it leaves quite a lot to be desired. The mower has a plastic strip on one end that’s quite deep and low, which means it pushes the grass down. This negatively affects the cutting result, particularly if you have individual tall weeds in the lawn that just bend out of the way. This design also means that the robotic lawn mower gets stuck on uneven terrain.

Wolf Garten Loopo S300

But it actually also gets stuck even on flat terrain. Initially, it’s only about every third cutting session that this happens, but as it builds up soil and grass between the studs, it goes into a negative spiral. It gets stuck more often, digs itself in and creates still more mess. In damp grass the problem escalates still further and really becomes a pain. So you have to maintain the Loopo S300 quite often.

In damp terrain, it also loses its ability to handle slopes, to an extent, skidding on very minimally sloping terrain as well. And on downhill slopes it instead has a problem slowing down. The relatively high speed on slopes can be a problem if you have an obstacle at the bottom of the slope, which the lawn mower then runs into quite forcibly, or a perimeter wire, which it’s likely to run over and come to a standstill.

A good approach to getting stuck

When it does get stuck, it switches off before the battery dies completely. This means you can started up again and adjust the position slightly – you don’t have to carry it back to the station and wait for it to charge up again.

And when it doesn’t get stuck, it can cut for quite a long time in one go. In other words, there are quite a lot of positive things about the Loopo S300 – particularly the app support – given its low price. But also quite a lot of negative things. If the manufacturer can stop it getting stuck so easily and come up with better solutions for terrain handling and tall grass, this would be an interesting budget buy. It’s currently most suited to people with flat, very small gardens who are willing to compromise on reliability to get a cheaper price.

Easy to installEasy to programUser-friendly designApp supportLong cutting time
Weak cutting motorOften get stockFew setting optionsSometimes bends the grass out of the way

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19. AL-KO Robolinho 100

Neat, light and quiet robotic lawn mower with very generous cutting width

Review year: 2018 Price class: Medium Battery: Type: Lithium-ion | Capacity 2.25 Ah/18 V Operating time: approx. 30 min/charge Rec. max. area: 500 m² Max. gradient: approx. 19° (35%) Cutting height: 20-60 mm, 15 step Cutting width: 20 cm Weight: 9 kg Noise level: 60 Db Length: 60 cm Width: 43 cm Height: 27 cm Blade type: Fixed PIN code protected: Yes Accessories included: No App support: No

AL-KO Robolinho 100

The Robolinho 100 is AL-KO's first budget class robotic lawn mower, and the fact that the company is relatively new to the market is clear from the Robolinho's AI. It's not yet as sophisticated as those of more experienced competitors, which leads to a limited problem solving ability. This means it more easily has problems with difficult terrain, such as roots, or loose surfaces, such as deep drifts of leaves.

Not very kind on your lawn

The Robolinho sometimes doesn't realise that it is stuck and the wheels continue to turn, which can damage the lawn.

Despite a weight of only 8 kg, the Robolinho is relatively strong and copes with gradients well for its price class. In addition, the cutting width is very generous and is actually among the widest in the test. In combination with the Robolinho's small size, however, there's a smaller safety buffer between the knife blades and the surroundings.

One potential source of irritation is that you have to unscrew a hatch on the base station to see if the perimeter wire is working.

The recommended maximum surface area of 700 m² is also hard to reach as the base station can't cope with a particularly long perimeter wire. But if your lawn is sufficiently easy to handle the Robolinho can be very reliable.

Smalllight quietvery generous cutting width
Weak problem solving abilitylimited reliabilityshort maximum cable length

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20. Stiga Autoclip 225 S

Strong motor and long cutting time but poor terrain-handling abilities

Review year: 2018 Price class: Medium Battery: Type: Lithium-ion | Capacity 2.5 Ah/29.6 V Operating time: approx. 150 min/charge Rec. max. area: approx. 1100 m² Max. gradient: approx. 11 -24° (20-45%) Cutting height: 25-60 mm Cutting width: 25 cm Weight: 9.8 kg Noise level: Low Width: 43 cm Height: 25 cm Blade type: Fixed PIN code protected: Yes Accessories included: No User manual: PDF

Stiga Autoclip 225 S

The Stiga Autoclip 225 S is a small and neat - but relatively heavy - robotic lawn mower that can cut for a very long time on one charge. This is also its biggest strength.

It's best on flat, completely even lawns. Here it is strong and has no problems with tall grass. However, it can run away on downhill slopes instead of braking, so it sometimes has problems cutting properly on these areas.

The charging station has to be positioned along the perimeter wire and requires a few metres of open space to the right and in front of it. This makes positioning of the charging station less flexible. Once you've fixed this, the 225 S has no problems finding its way home and docking.

A primitive interface

Connecting the charging station is amazingly primitive and could definitely have been made more user-friendly. The same applies to the positioning of the perimeter wire, which is more fiddly than average.

The cutting height adjustment is also primitive, requiring you to switch off the mower, turn it upside down and use a tool.

Stiga Autoclip 225 S

Unfortunately, the 225 S also has a relatively old-fashioned and clumsy user interface. The small two-line display only has space for a few words and buttons. This makes programming time-consuming. The options are also rather poor. For example, you can't set one or more working times per weekday. Instead you have to be satisfied with a maximum of two schedules with a single time interval in each one.

The app makes it possible to remotely control the robotic lawn mower as if it was a radio-controlled car. This is fun, but the practical use is minimal. Nor can you adjust the cutting time or tell it to start cutting.

Gets stuck everywhere

The robotic lawn mower has one wheel at the front and two at the back. Terrain-handling abilities are the 225 S's biggest weakness, and it gets stuck pretty much every day. For example, if it happens to end up nose down in a hollow in the lawn, it's almost never able to get out again on its own.

However, you can buy spiked wheels to attach alongside the normal wheels, and these improve terrain handling dramatically. The difference is so great that the 225 S with spiked wheels is more like an entirely different lawn mower. We would have liked these to be included in the standard package.

The Stiga 225 S is best on medium sized lawns that are flat and have a simple shape.

Long cutting time neat sizestrong motor
Poor terrain-handling abilitiesfiddly installation and cutting height adjustment

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21. Wiper C XH

Robotic lawn mower with long operating time but poor terrain handling

Review year: 2018 Price class:Medium Battery: Type: Lithium-ion | Capacity 5 Ah/25.9 V Operating time: approx. 120 min/charge Rec. max. area: approx. 1,100 m² Max. gradient: approx. 24° (45%) Cutting height: 25-60 mm Cutting width: 25 cm Weight: 9.8 kg Noise level: Low Width: 430 cm Height: 250 cm Blade type: Fixed PIN code protected: Yes Accessories included: No App support: Yes (Bluetooth)

Wiper Premium C XH

The Wiper C XH is a robotic lawn mower with a very long operating time given its price class, together with a strong motor. As long as it doesn't run into obstacles in the terrain, it cuts well and leaves a neat result. However, it has problems compensating for the extra speed on downward slopes, and here it has problems cutting properly.

The bodywork is relatively low. The lower part consists of a rubber part that's intended to bend if it gets stuck on an uneven lawn. In terms of appearance, it looks fine, but from a practical viewpoint it's not very effective. If the C XH's front wheels run into a hollow, it will undoubtedly get stuck. And unfortunately it can rarely get itself back out again, so it just sits and spins its wheels. Many other robotic lawn mowers cope with these hollows as if they didn't exist.

Its terrain-handling abilities are the C XH's biggest shortcoming, because they mean that the long operating time can rarely be exploited. Instead the robot gets stuck and stays there until you rescue it. Here it would have been useful to have an app that informed you when it got stuck, but this function isn't currently provided.

Should always be operated with spiked wheels

However, when we attach spiked wheels it behaves like a completely different lawn mower. The terrain-handling abilities are improved so much that we think these should be provided as standard.

One advantage with the C XH is that it turns itself off in time when it's stuck instead of sitting wasting the battery. So you don't have to put it back in the charging station straight after rescuing it, which is the case with many other lawn mowers.

Very old-fashioned interface

Unfortunately, the Wiper C XH can't be classified as particularly user-friendly, especially given the competition. Connection of the charging station, programming of the robotic lawn mower and cutting height adjustment are all old-fashioned.

Connection is carried out by baring and inserting the wires of the perimeter wire directly into the connection. Nor is it clearly marked which end needs to go in which connection.

Programming takes place via a two-line display, with words that are sometimes abbreviated to fit. Most people will need to get out the manual every time they need to change the settings because the buttons aren't self-explanatory and also have several different functions.

You also have to set the cutting height with a tool instead of a straightforward manual knob or electronic cutting height setting. This feels shame on an otherwise powerful and neat little robotic lawn mower. But when it's out cutting it does a very good job of keeping the lawn in trim. It also resolves problems with obstacles, for example, if a branch has fallen along the perimeter wire that means it has to take a U-shaped diversion to get home.

The Wiper C XH is best on uncomplicated, very level lawns of medium size.

Long cutting time neat sizestrong motor
Poor terrain-handling abilitiesfiddly installation and cutting height adjustment

22. Bosch Indego 400 Connect

Neat model for small areas

Review year: 2018 Price class: Budget Battery: Type: Lithium-ion | Capacity X Ah/18 V Operating time: approx. 30 min/charge Rec. max. area: 400 m² Max. gradient: 27% Cutting height: 30-50 mm, 3 step (manual) Cutting width: 19 cm Weight: 7.5 kg Blade type: Fixed User manual: PDF Video clip: Installation instructions

Bosch Indego 400 Connect

The Bosch Indego 400 Connect is a small, neat robotic lawn mower with a compact docking station that makes it easy to position even in tight spaces.

However, the installation is quite fiddly because the manual leaves a lot to be desired. It's very poorly translated and the installation instructions are unclear even for someone used to installing lawn mowers. The robotic lawn mower itself is also very sensitive. Pretty much everything has to be positioned perfectly to avoid errors during docking or mowing. Even variations so small that they aren't visible with the naked eye can cause the robotic lawn mower to go on strike. This means it can take a long time before the Indego 400 Connect is actually out there mowing.

The software in the robotic lawn mower is also badly translated and buggy. And the tiny display means that menu choices often have to be abbreviated and that it's not always obvious to the user what's going on. This is particularly clear when we ask normal homeowners to try changing parameters under our supervision.

Gets stuck and skids

The Indego 400 Connect has a narrow cutting width, but as it's only intended for small lawns the cutting time is still normal. The cutting result is good, with an even, neat lawn as long as your garden doesn't slope.

If it does, the lawn mower tends to slip, particularly in damp grass. It also often misses areas on slopes so you end up with tufts of longer grass there. Where the mowing surface is near a slope, you should place the perimeter wire little way in from it because the robotic lawn mower is otherwise likely to slide over the wire and stop.

The software also seems to have been strangely constructed. The robotic lawn mower often stops during mowing to "update the map". This leads to annoying small interruptions during the very short time it's actually out mowing.

However, it's good at finding its way home and docking when you have set up the charging station perfectly. It looks after itself quite well as long as you don't have to make changes in the software.

Neat size
Struggles with slopessensitive installation processbugs in softwarefiddly interface

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23. Worx Landroid S500i

Simple model with ongoing updates

Review year: 2019 Price class: Budget Battery: Type: Lithium-ion | Capacity 2 Ah/20 V Operating time: approx. 35 min/charge Rec. max. area: 500 m² Max. gradient: 35% Cutting height: 2-6 cm (manual) Cutting width: 18 cm Weight: 7.4 kg Noise level: No information | Measured average value: approx. 47.5 dB Length: 54 cm Width: 40 cm Height: 23 cm Blade type: Pivoting PIN code protected: No (no display) Accessories included: Installation material App support: Yes (Wi-Fi) User manual: PDF Video clip: Landroid S

The Worx Landroid S500i (WR105SI) is a small, easily programmed robotic lawn mower – once you’ve managed to connect the robotic lawn and the app. The app is one of its biggest strengths. For example, you can measure the size of your lawn, see the weather, check for software updates etc. The latter is a major plus point.

Other manufacturers don’t generally update the software on robotic lawn mowers that have already been sold. Updates are more often provided with the next season’s models. But – not unlike Tesla – Worx provide updates for all of their customers on an ongoing basis. We give them a major gold star for this.

It’s also really useful that the robotic lawmaker has a Wi-Fi connection. By placing the charging station within reach of your wireless network, you can keep track of how the lawn mowing is going. Unlike Bluetooth, you don’t have to be in the immediate vicinity of the robotic lawn mower.

Struggles with tall grass and wet ground

If the robotic lawn mower gets stuck, you get a notification immediately. It’s fortunate that this function is provided, because the Landroid S tends to get stuck quite often, particularly in more unruly grass. It doesn’t have a strong cutting motor. At the same time, Worx have placed a kind of comb along the long underside which collects debris and grass. After a while, this builds up and brakes the cutting motor, which means the robotic lawn mower comes to a stop and switches itself off.

The relatively deep tread patterns also fill up with mud and the more there is, the more often the lawn mower gets stuck – even on relatively flat ground. So you shouldn’t run the Landroid S when it’s rained or there’s dew on the grass.

Simple design works under simple conditions

The Worx Landroid S has no display. This means that – if you are running the app – you’re stuck with noise signals and an LED to carry out troubleshooting. If you have problems during installation, this can be annoying and complicated. But as soon the app is configured, you get text information providing you everything you could possibly need to know.

The charging station has a simple design, but works without problems on a flat surface. However, if it’s in a slight depression, the robotic lawn mower can end up slightly too low in relation to the plate inside.

The Landroid S has a very narrow cutting width and a problem-solving ability that’s often less than impressive. For example, there are no movement patterns for handling patches of taller grass, or obstacles along the route home. Combined with its poor terrain-handling abilities, you often have to put in quite a lot of work to adapt and adjust both your garden and the mower’s working hours to make sure it keeps working. Nor does it have PIN code protection. This means that anybody can start it when it’s sitting on the lawn.

These shortcomings are to some extent outweighed by the low price, telephone notifications and the great new app. Provided your garden is a bit smaller than the recommended size so the Landroid S can keep it neatly trimmed, it's a good buy.

Really good app, useful notifications, ongoing software updates
Requires regular cleaning, sensitive to tall grass, not very intelligent

Robotic lawn mower

Robotic lawnmowers have existed for more than 20 years, but it’s only in recent years that they’ve really taken off in popularity. This is at least partially due to falling prices, but also because the range of models has grown and robotic lawn mowers generally have improved significantly. Another important factor is probably that many people buy their own robotic lawn mower after seeing that the neighbour's model actually does the job and produces a satisfactory cutting result. This means that robotic lawnmowers spread in clusters, with one area of housing having considerably more than the next. But the trend is clear. The robotisation of lawn mowing is unstoppable. The traditional push lawn mower is still far from extinct, but the robotic lawn mower represents a constantly increasing share of new sales.

Major differences between different models

It’s hardly surprising that not all robotic lawnmowers are as good, and factors such as performance, efficiency, reliability, functionality and safety vary more than you might think between different models. With a correctly executed installation, the best robotic lawn mowers can get by for several weeks without stoppages, while the worst can have difficulties even finding their way home to charge. The best lawn mowers require little adaptation in terms of cable laying and surface for reliable cutting, while the worst ones have strict requirements in terms of surface, gradient and the design of the area to be cut. The safest robotic lawn mowers are so well designed that it's almost impossible to injure yourself on them, while the worst can constitute a safety hazard for things like feet or inquisitive small fingers. Some models can even escape from their enclosure and play havoc with the neighbour's flowerbeds

Our tests show that more expensive robotic lawn mowers generally perform better than cheaper ones, but that’s not always the case. Nor is it certain that a robotic lawn mower with a good theoretical performance in terms of surface capacity and gradient will live up to this in practice. In other words, you shouldn’t get too caught up in the specifications about how many square metres a robotic lawn mower can cut in theory. What’s much more important is the robotic lawn mower’s reliability and how much perimeter wire is supported by the base station, as these factors are more decisive in determining the cutting area it can cope with. Another factor to take into account is the type of signal used by the robotic lawn mower’s perimeter wire. Some models actually interfere with other robotic lawnmowers, which isn’t exactly desirable for a good relationship with your neighbours.

How much must I spend on a robotic lawn mower?

In our test of robotic lawn mowers, we have tested the market’s foremost models to find out how well they perform. The best robotic lawnmowers perform really well, but you get what you pay for and a model that can cope with a moderately tough to difficult lawn costs about £1500. However, this should be viewed in relation to the most expensive models that cost upwards of £5000. But if you have a flat, uncomplicated and not too large lawn you can get by with a significantly simpler model for around £1000. However, there's a big difference between a budget and premium robotic lawn mower, and a budget model isn't always enough to get the job done.

Because both price and performance vary so significantly between different models, we have divided the test candidates into three different price classes and named the winner in each price class as follows:

Budget: up to £1100 Robotic lawn mowers in this price class should be able to cope with smaller, uncomplicated lawns with a uniform surface. Both problem-solving ability and terrain-handling abilities are normally quite limited.

Medium: approx. £1100-£2000 In this price class you should be able to expect that the robotic lawn mower will be able to cope with relatively tough lawns of around 1000 m². Both the problem-solving ability and terrain-handling abilities should be sufficiently good to deal with the majority of lawns. Unfortunately, many medium priced models can’t cope with this.

Premium: more than £2000 Models in this price class should be able to cope with large, complicated lawns with many obstacles, narrow passages and complex cable laying. They should ideally also be able to cope with steep gradients and troublesome surfaces. Unfortunately a large proportion of premium models fall down on several of these points.

Useful information about robotic lawn mowers

AI

AI stands for Artificial Intelligence. This is what gives robotic lawn mowers their problem-solving ability.

Just like people, the better they are at solving a variety of problems, the more intelligent robotic lawn mowers are considered to be. Working out how to make a robotic mower more intelligent is an extremely expensive process that involves a great deal of trial and error. For this reason, robotic lawn mowers from companies that have been manufacturing them for a long time tend to have a better AI than newcomers, whose models often demonstrate "teething troubles" in terms of problem-solving ability.

In practice, this is because some manufacturers have succeeded in creating more intelligent algorithms than others. An algorithm can be seen as a set of instructions that tell the robotic lawn mower what it should do in a range of different situations.

User-friendliness

Probably the major reason to buy a robotic lawn mower is to save time and effort. So it's obvious that you want it to be user-friendly.

To begin with, installation should be simple and straightforward, so that you can easily start using your robotic lawn mower. Some models are easier to install than others, and this difference can be particularly clear if you're doing the entire installation yourself for the first time.

When the installation is complete, the most important aspects that must be user-friendly are the robotic lawn mower's computer and control panel. The interface and menu system should be so intuitive that it's easy to navigate through the different functions. If the control panel has too few buttons, programming becomes time-consuming, while too many buttons can be confusing if the layout isn't sufficiently clear.

Build quality & durability

Robotic lawn mowers are expensive and complicated products, so it's important they don't break down. The factory guarantee covers the initial period, but after that you have to pay for repairs and maintenance yourself.

In general, a high build quality means a durable robotic lawn mower. To have a long lifetime, the robotic lawn mower should also be impact resistant and not sensitive to external influences. It should therefore be moisture-resistant; in a rainy and damp climate, moisture should be prevented from penetrating the many circuits that make up a robotic lawn mower.

It should also be heat-resistant so that it doesn't overheat from being out in the blazing sun for days on end. The blades should also be robust so that they don't bend or break when they hit hard objects such as stones, roots or forgotten toys.

Design

The design of the robotic lawn mower determines not only how attractive it is but also how reliable and durable it is - and how well it handles difficult terrain. Robotic lawn mower designers must constantly manage conflicts between aesthetics, performance, functionality, manufacturing costs and safety.

For example, a bigger cutting width is almost always preferable from a purely technical perspective, as it makes the robotic lawn mower more stable and quicker at cutting the lawn. At the same time it's also more expensive to manufacture such a mower.

A smaller safety buffer around the inside of the housing makes possible a wider cutting width but simultaneously increases the risks of accidents. In the same way, a big red "STOP" button is useful from a safety viewpoint, but from an aesthetic perspective it's nicer if it's a bit less visible.

So in a well-designed robotic lawn mower, all of these factors are taken into account.

Reliability

Reliability is perhaps the single most important characteristic of a robotic lawn mower. The whole idea of a robotic lawn mower – like all other types of robot – is for it to look after itself and to require as little work from its operator as possible. When the robotic lawn mower has been installed and programmed, it should therefore require minimal effort from its owner. An extremely reliable robotic lawn mower won't necessarily be able to cut the grass everywhere, but at the same time it should never get stuck anywhere either. But of course you also want it to be able to cut the more tricky parts of the garden. In practice, this means that no robotic lawn mower is completely reliable, and that they all sooner or later get helplessly stuck somewhere. However, for the most reliable robotic lawn mowers this happens very rarely, while the least reliable get stuck very often. The characteristics that are most important for reliability are the robotic lawn mower's terrain-handling abilities and its AI.

Terrain-handling

A robotic lawn mower's terrain-handling is the decisive aspect of its functionality. Partly because it determines where the robotic lawn mower will be able to cut the grass, and partly because it indirectly determines how often the robotic lawn mower will get stuck.

The most common obstacles that we identified in our robotic lawn mower test are:

Lumps and bumps: The simplest lawn for a robotic lawn mower to cut is completely flat. However, this is an ideal that the majority of lawns simply don't meet. Particularly in Sweden, where lawns are often allowed to retain a slightly more wild character. So it's common to encounter lumps and bumps – particularly small ones – which you don't necessarily think about before they cause problems; for example for your robotic lawn mower.

Gradients: Lawns often extend over inclined ground such as slopes, banks etc. Sometimes the gradient is minimal, sometimes it's severe. It's primarily major gradients that cause problems for robotic lawn mowers, even if the slope itself is short. Sloping ground is a challenge for robotic lawn mowers, and the majority of them can cope with a maximum 15° gradient. The best models can cope with 20-25°, which means that they are able to handle the majority of garden gradients.

Obstacles: Obstacles can be found in practically all gardens, and present the most common type of challenge for robotic lawn mowers. There are many common obstacles, which include trees, fences, walls, posts, compost heaps, pots, bushes, roots, paths, patios, flower beds, flagpoles, statues, sandpits, raised vegetable beds, log piles, swings and trampolines. The challenges created by obstacles vary significantly in type and level of difficulty. The most common obstacles are also among the most easily managed and involve hard, uniform objects that stick straight up out of the lawn, such as trees and fences. All robotic lawnmowers should handle these with ease. More difficult obstacles are things like bushes, trampolines and swings if they are attached to the ground with planks. The roots of bushes can trap robotic lawn mowers, while they can easily get stuck in trampoline legs or any planks used to attach swings.

Surface: There are a number of different surfaces that provide major challenges for robotic lawnmowers, such as roots, gravel, loose earth/sand, newly planted grass, leaves, pine cones and clay. These all create a loose and/or slippery surface which it is easy for the robotic lawn mower's small wheels to get stuck in. To handle difficult surfaces efficiently therefore requires sufficiently large wheels with sufficiently effective patterns. Of course the width of the wheels also affects the terrain-handling capacity, but with the right pattern and a machine that's not too heavy the wheels can be kept surprisingly narrow.

Challenging cutting surfaces: There are a number of common cutting surfaces that are particularly demanding for robotic lawn mowers.

Narrow passages/bottlenecks are challenging for a robotic lawn mower as it doesn't have eyes and so can't see in which direction the passage goes. This means that the lawn mower finds it difficult to "find the right way" and instead moves from side to side in the passage. Intelligent robotic lawn mowers have been programmed to avoid this type of situation and to quickly escape. A common trick that many robotic lawn mowers use to guide themselves through narrow passages is to follow the perimeter wire for a certain distance from the base station or to follow a guide cable.

Sharp corners are often a problem as they risk causing the robotic lawn mower to "go off track" and cross the perimeter wire. A safe lawn mower stops by itself when it realises that it has left its "enclosure", but on the other hand it will remain stationary until the owner reactivates it.

Corner areas with lots of obstacles can represent challenges as the lawn mower risks becoming "trapped" if it constantly collides with either the perimeter wire or the obstacles surrounding the corner. To avoid the robotic lawn mower wasting time in a corner therefore requires a sufficiently intelligent robot that can quickly work out an escape route.

Secondary areas are areas that are separate from the primary area but which must also be cut. For example, a secondary area could be the smaller lawn in front of a house with a big lawn (the primary area) in the back garden. Often the secondary and primary areas are connected by a narrow passage.

Robotic lawn mowers are not intended or designed to cope with long, coarse or wet grass. An overgrown lawn may therefore need to be cut with a conventional lawn mower before it becomes manageable for a robotic lawn mower. This applies particularly to small lawn mowers. Even if the lawn mower manages to force its way through the long grass, it often has to drive over the area several times in order to gradually cut the grass short. The lawn mower's wheels press the grass down each time it passes, which often results in the long grass gradually lying down rather than being cut. This particularly applies to robotic lawn mowers with pivoting blades, which are designed to give if they encounter too much resistance. Long and coarse grass is therefore one of the few areas where fixed blades are preferable to pivoting blades.

Price classes in the test

Budget: up to £1100 Robotic lawn mowers in this price class should be able to cope with smaller, uncomplicated lawns with a uniform surface. Both problem-solving ability and terrain-handling abilities are normally quite limited.

Medium: approx. £1100-£2000 In this price class you should be able to expect that the robotic lawn mower will be able to cope with relatively tough lawns of around 1000 m². Both the problem-solving ability and terrain-handling abilities should be sufficiently good to deal with the majority of lawns. Unfortunately, many medium priced models can't cope with this.

Premium: more than £2000 Models in this price class should be able to cope with large, complicated lawns with many obstacles, narrow passages and complex cable laying. They should ideally also be able to cope with steep gradients and troublesome surfaces. Unfortunately a large proportion of premium models fall down on several of these points.

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