We are replacing our 16 year old hot water heater that has not be running the last day or so. The plumber tested the water pressure of the tank at 90 PSI. He said that is too high. We had a PRV valve installed a couple of years ago where the water comes into the house. The plumber is saying that it must be bad and it will need to be replaced with the water heater or it voids the warranty. Is this true?
Normal household water pressure is about 40 to 50 PSI. A water heater pressure relief valve is normally set to to open at 150 PSI so 90 PSI voiding a warranty seems like a stretch. If in fact your pressure is at 90 PSI I'd be concerned about your faucets and appliances valves, ice makers, etc.. because 90 is too high. I'd ask him to check it again and watch him do it (so you'll know how to do it in the future, LOL) if it's high, you might want him to do it. If you have him do it, think about also having him replace your main shut off as those almost always go bad and they're usually right next to the PRV. Good luck and stay safe out there.