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EDR for given room size

Anyone with a link to a calculator or chart I can fill out to let me know the approx. EDR required for a room? I have an existing radiator that leaks and needs to come out (so I can repair the rotted floor beneath) at the same time I want to bump the size up a bit. The room was renovated (made bigger) years ago and the existing radiator was not upgraded. Hopefully the boiler can keep up but it shouldn't need to be much bigger...

Got a link / chart / method for relating radiator EDR to room size/windows etc?




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