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Water in Sight glass on steam boiler goes down 1 1/2 inch a day
Hi, I have a question my pennco 1660 hsd steam boiler, one pipe system I notice the water level in the sight glass goes down about 1 and 1/2 inch a day which causes the water feeder to kick in and bring it to regular level. I'm worried this is not normal and am not sure what to do. The heat works fine and all radiators heat well. I do not see any leaks or water around radiators or boilers. Last year I had return pipes replaced. If anyone can advise me on what I can do. Thanks. V