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- BTU Calculator - Radiator Sizing Guide
How many BTUs do I need to heat my room?
What if I like a Radiator that doesn’t match my BTU requirements?
It is possible to increase the BTU output of our radiators by increasing the temperature of water put through them. All our radiators are tested at 60°C/140°F. Alternatively you can have multiple radiators in one room. If a radiator is too high powered for a room, you can just turn it down with the valves provided!
What are BTUs?
BTU stands for 'British Thermal Unit' and is a measurement of energy. One BTU is approximately the amount of energy required to heat one pound of water by 1° Fahrenheit - about the same amount of energy produced by a single 4-inch kitchen match that's been burned from one end to the other. BTU’s are commonly used to measure and compare the heat output of different hot water radiators.
How do I know how many BTUs my room needs?
Every room loses heat in a different way, therefore your BTU requirements will be dependent upon a number of different factors in each room. These considerations include the size of the room, what is above and below it, what kind of windows there are as well as the number of internal and external walls. Rooms with large open spaces - or those with more windows and external walls - will require a much higher BTU output than a smaller more enclosed space like a bathroom or an en-suite. To put it simply – the bigger the room, the higher the BTU output you’ll need. Please note: the figure calculated is for the combined BTU output of all of the radiators or heated towel rails in the room (larger rooms may require the installation of more than one radiator/heated towel rail).