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Where is the water in my boiler going?
My one-pipe steam heat system loses enough water that the LWCO feeds it weekly during the heating season. It did this before I replaced the old snowman conversion oil burner with a new Burnham gas unit a couple of years ago, and it still does, at about the same frequency, now.
There are no under-the-floor returns. Everything is visible, and there are no obvious leaks.
Is the system losing water at the radiator shut-offs? I don’t see that happening, but I can’t say that it’s not. Does anybody have a good technique for determining if one of them is the problem? Or is there some other place I should look first?