The concept of a washing machine is that your laundry is spun around with water and laundry detergent to remove dirt. This is followed by centrifugation where the water is wrung out.
The washing machine takes in the water through a water inlet hose, and the water is then mixed with the laundry detergent that has been added to the detergent drawer. The rotation of the drum ensures the mixture covers all the laundry.
If there is plumbing, water, and electricity already installed, it can cost between £100 and £250. It becomes increasingly expensive if the installation requires new plumbing or electricity to be rewired to the place the washing machine will fit. In that case, the cost can be between £500 and £1,000, depending on the difficulty of the installation. If electricity needs to be installed or rewiring is necessary, this needs to be done by an electrician.
An average washing machine uses around 1 kWh per 60-degree wash cycle. With an average cost of 17 pence per kWh and a laundry detergent cost of about 10 pence per wash, in combination with the cost of water, it equals to about 35 pence per load of laundry. There is money to be saved by doing the laundry during the night, but if you live in a flat, you should be aware that this can be disturbing for your neighbours.