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Yes - there is an in-line pressure & temp gauge, on the feed line that goes to the floor tubing. It is in-line after the circulating pump. That gauge shows 12 psi and has never changed through this...

Nope - the pressure valve still pops open. I verified again, no water coming out from schraeder valve of expansion tank. So, if expansion tank is OK, the only other cause is that the new 30 psi...

Thanks, all. The tank rings hollow & the valve emits no water when I et out a LITTLE air. The hot water heater has ben empty & pilot has been off for a few days now, so I will refill the hot water...

That is what my expansion tank looks like... Pardon a silly question... How do I "check" it?

Thanks for helping!

I have an in-fllor basement hydronic heating system, using a standard, dedicated hot water heater. The system's worked great for the 8 years we've been in the house, which is 14 years old. Earlier...

House has sump pump & ejector pump. Only connection to ejector pump is water softener (no basement bathroom). Ejector pump runs routinely, but sump pump very rarely runs. City water department...