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

What size radiator do you need?

ROOM TYPE Bathroom WINDOW TYPE Single Glazed IS THE HOUSE Sheltered

Enter room measurements in metres or feet

LENGTH (m) WIDTH (m) HEIGHT (m) LENGTH (ft) WIDTH (ft) HEIGHT (ft)

Calculate

BTU/hr

From To

Watts

From To