Question: how much electricity does a electric radiator use?
Answer: If a 200w electric radiator is on for 5 hours that will use 1kWh of electricity – so will cost 12.5 pence to run. (That is simply 0.2kW x 5 hours = 1kWh). If a 1000w electric radiator is on for 5 hours it will use 5kWh of electricity – so will cost 62.5 pence to run (1kW x 5 hours = 5kWh).