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i have an older 1988? HBSmith gas fired furnace, 2 heating zones. i have issues with my safety blowing occasionally. i just changed the expansion tank and 30# safety valve and old B&G circulating pump and it just burped again 2 days after the change. i probably would have never known except the **** safety never resealed and i now i have a soggy basement. any advice on what else could make me overpressure? i was going to block in the feed regulator and run it as a true closed loop but am unsure if this is a good idea. not sure if this helps but after drainign and filling the system a few times i cannot keep clear water in the system, always brown