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Steam heat problem -- mystery leak?
I have been having a curious problem with my Weil McLain gas system. The furnace, which until recently worked fine, has begun to lose water at an alarming rate--as quickly as 12 hours or so for the low-water cutoff to trip. I can't see any evidence of a leak, however, and the radiator valves appear to be functioning well. The only thing that has changed recently (besides reprogramming the thermostat) is that we had a french drain and sump pump system installed in the basement. The contractor insists he didn't hit a pipe anywhere ...
Any thoughts? Thanks!