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Quick guide is to multiply the length x height x width of the room in feet (round it up to the nearest foot ) then for a living room/dining room/ bathroom multiply by 5 or bedroom/kitchen multiply by 3 that will give you a BTU rating. Then just look for a radiator a little bigger in it's rating than that.
Alternatively use something like www.diy.com they have an online calculator in the radiator section.

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15y ago

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