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Losing all the water in steam/oil boiler every day - changed return lines - still losing water
We are losing water in our boiler. We used to fill it once a month, then in the last 6 months we now have to fill it three times a day. We have no knocking or visible leaks in the three story house radiator/valve system. One valve in the 2nd floor bathroom spits a little steam. We were told it was the return lines and had them replaced this week. This has not worked, the boiler still needs to be filled three times a day, even though the return lines have been replaced to the boiler. No lines are now underground they are all above ground. We don't see water on the floor in the boiler room. The boiler vents to the chimney. The boiler is old, possibly original to the 1935 house. The metal is fatigued. There is not an auto feed on the boiler, there is an auto cut off mechanism when the level of water drops. The house pitches towards the boiler, so that should help the water/steam to return through the return line we thought. Can anyone help us solve this mystery. We had the return pitched to avoid knocking a few years back but the draining problem started happening a year ago. Can anyone help us work through this problem. We have had one technician and two contractors and a plumber look at everything, and they all said change the return lines. We did that and it has not worked. Any help would be very much appreciated.