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HELP: How do calculate BTU of existing radiators?

Hi there,

Would anyone happen to know how you calculate (roughly) the BTU output rating of a radiator, when all you know is it's size?

e.g.

530mm x 1450mm (single panel, convector)

530mm x 1450mm (single panel only)

700mm x 950mm (double panel convector)

530mm x 1550mm (double panel convector)

There seem to plenty of online calculators for working out what BTU you need (calculated by room size, etc), but I can't find any for working out what you've actually got! (calculated by the dimensions of your existing radiator).

Many thanks :)
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