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Strange near boiler piping here......
Can someone take a look at these pictures of a customer's home we were at recently. They called us there for a Rinnai tankless estimate. Currently they are getting HW from the tankless coil in the 1-pipe steam boiler. Customer thinks the boiler is from the 60's.
They have zero main vents in the basement and have some rooms that never get warm. The supply leaving the boiler is 3" and it splits to 2- 2" mains which wrap around opposite ends of the home, then join back at the insulated vertical line in the picture.
The first 15' or so of the supply lines are pitched back to the boiler and each feed 2-radiators along their run, so I assume the tees on either side of the 3" main are to receive condensate and keep it from raining down the 3". The rest of the main changes direction and condensate flows with steam. Each main is about 60' to 70' total length.
How is this working that the supply and returns are joined above the water line?
Steam must be traveling up the return as well as I can't see anything to stop it.
I can understand the 2-supply tees draining condensate but they should be brought down to a wet return, not above the water line?
The mains are being vented thru the radiator vents which must be killing his fuel economy.
I think this one will be a candidate for a replacement.
Oh yes, the tankless coil is shot as well, so I have some figuring to do for these people.