Typical immersion heater running costs are around 50p per hour, based on the system using in the region of three kilowatts of electricity each hour.
Considering that most properties will need to have their immersion heater switched on for at least two hours a day to make sure the water is warm enough, heating costs over the course of a full year are likely to total at least £360.
To find out more, explore our dedicated blog on the subject – The Ins And Outs Of Immersion Heaters.