Salvagedoctor

BTU calculator

Welcome to the Salvagedoctor online BTU Calculator.

A radiator needs to have sufficient output to ensure effective service. Please fill in the required information below to establish the minimum output in Kilowatts (metric measurement) or BTU-British Thermal Units (imperial measurement) your radiator needs to be.

Due to the large variety of factors affecting heat loss from your room for example, local weather patterns and wall coverings to name but a few, results from different calculators can differ slightly depending upon the amount of questions they ask.

Our calculator requests key relevant information but won’t take all day to fill in. We hope that you can use it to establish a guide for your radiator sizes and recommend that you seek the advice of a qualified heating engineer if in doubt. Please ensure you fill in all the required fields below.




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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%
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