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I have "The Lost Art of Steam Heating". I remember reading in it *somewhere* that one can use uninsulated pipe as a sort of a radiator for small spaces. I also seem to recall that it had a table that listed the EDR of different pipe sizes per foot. But for the life of me I can't find it in the book and I even wonder if I was imagining it. Can anyone point me in the right direction for a table that lists the per foot EDR for black pipe?