Not necessarily.
If your room needs 700W of heating to maintain your target temperature, then any radiator with greater capacity will cost the same amount to run.It doesn’t matter if it’s a 1000W heater or a 2000W heater - the thermostat will regulate their output to match the heating needs of the room.
The power usage will equal the heat loss rate of the room.The only difference is the larger heater will be able to get the room to your target temperature faster. Once that’s reached, it will operate at a lower surface temperature than the 1000W heater. But the running costs will be the same.
If you used a 500W radiator in the same room, it would be cheaper to run… but that’s because it would not be able to bring your room up to target temperature and you’ll feel too cold!
Remember that the heating needs of a room change significantly with the weather. We calculate your heating needs based on the worst daytime conditions for your home… e.g 7am in the coldest week of July. We want to make sure what we recommend works for you year round.
A room that needs 700W in these conditions may only need 350W later in the day when the sun is shining and the air has warmed up.
