The Radiator Gallery

0800 055 6450
0800 055 6450
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BTU Calculator

What size radiator do you need?

This heat output or 'BTU' (British thermal unit) calculator is a great way to work out how much radiator power you need.

Room type
Window type
Is the house
Enter room measurements in metres or feet
Length (m)
Width (m)
Height (m)
Length (ft)
Width (ft)
Height (ft)
BTU/hr
From
To
Watts
From
To