How do I work out the radiator output needed for a particular room?
If you are replacing an existing radiator and are happy that the old one produced enough heat for the room, then it should be reasonably straight forward to identify the output of the radiator by finding the nearest size and design to your old one. From the published output of the near equivalent you can then search for a new radiator of the style that you want and of the appropriate output. If you are starting from square one, things are slightly more involved. In the absence of existing radiators, you need to work out the rooms heat loss. You can either do this by working it out long hand down to the nearest watt, or the quick ‘close enough’ method is to use our radiator calculator. Once you have you have a heat loss figure in watts, you then need to select as the output size of radiator, ensuring that you correct any published radiator output data to the conditions prevalent in your application. Once you know what output you need and you know what the output of a particular radiator
