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Boiler Sizing/Radiator BTU
I'm looking at Dan's book The Lost Art... and trying to correctly size a replacement steam boiler for a client and I'm confused about figuring radiator btu. I have the height of all the rads, and the number of tubes from side to side (they range from 6 to 28). They all have thicker tubes (about 2" oval)-think they're called column radiators. Where do I go from here? Thanks.