My electric water heater is about 3 years old, I noticed that the T&P relief valve was allowing water to "port" out of it and down the drain line, thinking the valve was bad I replaced it but still have the same problem. It only seems to happen after some hot water has been used and the tank is heating up again. Water pressure at an outside hose bibb is around 60-80, the pressure at the tank when it is idle is about 70, when the "leaking" happens the pressure at tthe tank goes up to about 142. Should I be looking at a thermal expansion tank?? Thanks
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T&P valve issues