British Thermanl Unit or BTU for short is a measure of heat output. We believe it is the best way to work out what size radiator or how many radiators you will need in a room. There are many factors to consider when calculating BTU such as room dimensions, room type, windows and orientation. Please feel free to use our BTU calculator below to work out what radiators you will need.
Your BTU Result:
From the results we’ve calculated, you may only need one radiator. Look for one that covers your BTU
requirements, if you can’t find a radiator that fits with the BTU output you require, then we would
advise you to fit multiple radiators at a lower BTU output.