The size and wattage you’ll need from your electric radiators depends on the size of your room, the quality of your insulation and the location of your property. Wattage measures your radiator’s maximum power output, and determines what size area it can heat.
You can use our radiator calculator to work out what wattage you need to heat your room.
You’ll need to find a radiator, or combination of radiators, which adds up to the required wattage. For example: if your required wattage is 1250W you could heat your room using a 450W and 800W radiator.
If it’s a choice between going higher or lower, always go higher. Underspecified radiators will work inefficiently when trying to heat a larger space. More powerful radiators will simply use less power when the room reaches temperature.
Please note that this calculator has been designed to calculate wattages for rooms with a standard rate of heat loss. If you are looking to heat a conservatory, high-ceilinged room, hallway, multi-storey room, garage conversion, or any other space that requires a higher heat output, you should speak to our sales team for an expert heating consultation.
The final thing to consider when choosing your radiators is the physical size. For example: maybe you could use a 1000W radiator to heat your lounge, but you might find that two 500W radiators work better with the available space.
The depth of the radiator you choose is also important to consider, especially if you’re heating smaller rooms. Choosing a slimline radiator will minimise the degree to which your radiators intrude into the room. Our slimline radiators start from as little as 7.5cm deep.