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All you need to do is to type in your room measurements, set the correct units and click
the "equals" button to obtain an indication of the heat output needed to adequately heat your room or rooms.

LENGTH:        WIDTH:        HEIGHT:   
Click for result!    kW of heat output needed.
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Dunsley Calculator
Use the calculator to get an idea of required heat output per room

Whilst the heat calculator is a generally accurate tool it should be used for guidance only, if accurate and specific ratings are required please contact a HETAS approved heating engineer or see the appropriate brochure / instructions for the appliance you are considering.

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