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Please note that the calculated figures are a guide - the best way to get an accurate calculation is to employ the services of a plumber. However, our BTU calculator serves as a good guide as to what level of BTU and Watt output will efficiently heat your room. Outdoor temperatures, external walls, insulation, and heated adjacent rooms also all play a part. The boiler should be sufficient to supply all connected radiators to the sum of their maximum demand.

Please remember, that it is also possible to combine radiators to achieve the required BTU level. Many rooms have more than one radiator in them for this very reason. Larger rooms such as Living Rooms generally require more than one radiator positioned evenly throughout the room. If this is the case, divide the required output by the number of radiators needed.

In line with current legislation, all of our outputs are displayed at Delta T50ºC to ensure accurate comparisons can be made.