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Boiler Pressure Spike while under heat
My Oil heating system has been spilling water from the PRV for the last few days. After some observation, it only happens while the system is heating. The pressure remains constant (10-15psi) while at rest but when heating, as the water temperature increases toward 170 degrees the pressure slowly rises to and past the 30psi threshhold causing water to leave through the PRV.
While doing some research on lunch at work, I assumed it was a bad expansion tank so I ran out and grabbed one. However, I inspected my tank at home and it seems fine, not waterlogged as I expeted it would be. It's only hot on the very top and there is air in it. I haven't checked for the exact air pressure in it though. I have started to doubt it is the tank.
My system is less than 10 years old and last year I replaced the pump and PRV.
Thank you for your help.