BTU Calculator - for cast iron radiators


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Welcome to our online BTU calculator.

In order to establish the size of radiator you require, we need to calculate how much energy you need to heat the room. This is measured in Watts (the metric measurement) or British Thermal Units -BTU (the more familiar imperial measurement)

Please feel free to use our version below to assist you in sizing your radiators.

If you have done your research you may well be asking "Why do the various online BTU calculators differ so much in their results?"
There are many different factors required in order to establish an exact figure for your room. These include numerous factors like plaster thickness and your geographical location to name but a few. Some calculators will ask you 20 or more complicated questions requiring you to enter surface areas for various wall finishings for example, others only 5 basic questions. It is fair to say that the more information you give, the more accurate the result. It is also likely that the less information requested, the higher the BTU result given in order to cover inaccuracies. Our calculator will ask you some key questions that we feel are the most important but won't take all day to achieve a balanced result! We recommend that you use this to establish a guide for your radiator sizes only and .. wait for the disclaimer!): .. We always recommend that you seek the advice of a qualified heating engineer if in doubt.

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Ventilation heat loss:
Heat loss through floor:
Heat loss through exterior walls:
Heat loss through glazing:
Heat loss through ceiling:
Total heat loss + 10% = =

Heating requirements BTU calculator from Cast Iron Radiator Repairs

Please contact us if you have any questions or comments.

 

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