Remodel plumbers moving the sink. Homeowner hired me for heating and air. GC has his own plumber
You are correct grasshopper,this is why in commercial industrial buildings with boilers maintence will trip the relief valves once a month and have to note that it was done on record,this is to keep the relief valves from corroding up and becoming a ba,no not a ba but a bomb lololololoIf the t&p leaks for a while it can get a buildup of rust that stops it from opening.
We had a 3yr old residential boiler we installed blow a chunk of cast iron off the back a couple years ago. The t&p had corroded shut. I don't remember which control item failed, I would guess the thermostat.
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A number of years ago I decided to test the crusty looking relief valves in some houses where if they dripped after it would be fine. I did this a month or two before heating service season. Kept the heat guys on their toes and probably stopped some bad things from happening lolz.......trip the relief valves once a month .....