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[Updated 3/18] A new set of radiant heating questions!
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Moved in and became the owner of a fun hydronic heating system; baseboard heating on two floors and in-floor heating in two rooms, PEX, manifold, and all. All but baseboards installed around 2012.
Recently found water on floor. Boiler at 30 psi; diaphragm expansion tank is shot (no air). Was quoted an absurd amount to have it replaced, so doing it myself. In the process, would like to replace the air scoop I have with a Spirovent Jr.
Currently, my air scoop and exp. tank are on the return side. I see Spirovent is intended for supply side. Does it matter in the end? Likely won't get the best results, but I am thinking it is better than the scoop anyway and easier than redoing other parts of the system to retrofit.
Found a diagram of the system's piping and control logic. If not clear in picture, cold water supply for the system comes in via the tee above exp. tank.
Greatly appreciate any advice. Easiest to just replace exp. tank and leave scoop, but would like to improve system if possible--hence, the Spirovent addition.
Saw this post with some comments on the situation, but my pump is up against boiler and not between the Spirovent/air scoop and the boiler, as discussed. Perhaps there's more there that I'm missing?
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