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Just bought house - leaking wet return?
I just closed on my first house. It's got an ca 1992 oil-fired steam boiler Weil-McLain AB468. There were some issues with the furnace so the seller had it examined and found a water leak at the coil plate fitting and a malfunctioning auto waterfeed. The seller had those repaired and the system inspected and the heating tech said all seemed to be in good condition except he could not vouch for the wet return as it was under the cement floor. The return comes down the back wall of the cellar and goes under the slab for about 10 feet back to the furnace. I can see where they dug up a section of the floor at one point, my guess to replace a bad section.
Since moving in, I've heard the autofeed kick on about every half hour. Since the boiler was just inspected my guess is I have a leak in the wet return under the floor. How can I verify that it is leaking there?
I read someone said an infrared camera would help. Any other ways that do not involve me getting a camera?
Also, assuming it is leaking there, I have a friend whose Dad is in the concrete business and has access to a concrete saw. Assuming I cut out the floor and expose the bad section, whats the best material to replace it with? I read black iron piping but do I need to insulate it or seal it in anyway? Some things I read said back iron will rust pretty quickly underground and I do not want to have to do this again if possible?
I also heard black steel was the material to use. Is this available for the DIY? Does HD/Lowes carry it and can they thread it?
Any other help/hints anyone can provide?