Originally Posted by ballvalve
The guys here should have told you that you had a leaking T&P, not a over pressure issue when you opened other taps and it continued to leak.
He didnt have a leak previously, and no one changed his plumbing, and a PRO installed the heater WITHOUT a ex. tank, so Sherlock would go direct to the valve seat.
Hopefully you didnt waste your money on a expansion tank.
And I'll bet if he opened and closed the 'defective' T&P several times, it would have seated and stopped leaking anyway.
Maybe if he didn't have the installing plumber coming back out we would have gotten into the diagnostics....
Your wisdom or, lack thereof never ceases to amaze me...