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Probably my dumb, but searching this great site for what I assume is a simple calculation is proving challenging. Lots of help on the net to tell me how to calulate my BTU requirement, but not the actual output of my old radiators.
I suspect the rads are circa 1930 - very heavy!
We have just replaced the empty air behind the walls with 3.5" of sprayed in foam, and the old windows with low e thermopane - so we know we have way too much heat overall and also lots of different sized radiators, so loooking to match old rads with new rooms' heating requirements in some cases, and replace with new rads in others.
As a result, want to calculate the output in BTUs of various size rads, and can't seem to find a calculator for that.
For example: I have one radiator that is
49" long, 9.5" wide, and the fins 17" high.
Fins are 20 wide by 6 deep, approx 1.25 inches in diameter, on 2.5" centres.
All feeds are at the bottom - some same end and others opposite end feeds.
All are painted wit metal paint, some - some white enamel and other silver
Any suggestions welcome.
Thanks very much.
"Sail fast - live slow" (build even slower)