high pressure

Update: After posting this. I found major issue in this setup. Please see my updated figure below. The issue is that the filtration loop was going nowhere. The diagram explains it best. Hello, Please bear with me as I explain the situation. It is very odd and I cannot find a resolution. I...

Newbie here. I just noticed my Oil Fired Burnham Boiler wasnt shutting off when heat runs. I turned Tstat down so it stopped. Went to check temp and it was almost 200 with pressure rose to 20psi. Normally at 15. I have Hi/Lo set at 180/150 and diff at 12. Maybe I never noticed before but why...

For my first post here - a family I know moved into a house that's three levels, garage is at ground level and has two gas water heaters, one for each flat above. Both are 48 gallons. Each has four settings: A B C and Very Hot. Both are set at A. Both tanks have brand new T&P valves. They...

I did a quick forum search and I'm not sure I have the same issues others have had with needing to install expansion tanks. When I turn on either hot or cold (or mixed) the initial pressure is somewhere around 150psi (confirmed with a gauge at the hose outside). Then after 10-20 seconds or so...