Welcome! Here are the website rules, as well as some tips for using this forum.
Watts 174A Pressure Valve Seeping?
We built a home in the Colorado mountains 14-years ago. Radiant heat on main floor, baseboard on 2nd floor, Dow. 11’ height between bottom of boiler and baseboard. We have a continuing problem with random puddles of glycol seeping from the Watts 174A 30lbs. pressure relief valve. The valve has been replaced 3 times, along with the expansion tank. Original plumbing contractor totally incompetent. Had controls miswired so calling for heat 24-hours a day. Didn’t install shutoff between supply and return manifolds, one zone didn’t work. Plumber could not solve. General found that they installed one loop on supply, the second on the return. So I don’t trust any of their work. They set up system and expansion tank at 14lbs. Cold. It runs about 24lbs. Max. Temp is 180. With everything running. I installed a Watts pressure gauge with a pointer that display maximum pressure. Never over 25lbs. The plumber originally had a glycol mix at 70%. It is now down to 25%. I would appreciate any ideas on troubleshooting and what the cold system pressure should be set at. We are at 8,600’ but I don’t see how altitude would impact pressure. Thank you.