My main question: should I do more debugging or is it safe to assume I just need to replace the T&P valve? My issue seems more extreme than most videos/articles about fixing a leaking valve and I want to know if I should investigate more serious concerns with the tank or plumbing?
NOTE: My heater has a pressure expansion tank that was installed.
I know very little about home improvement (first time home owner). I had my hot water heater (located in my garage in the corner on a small pedestal) replaced in March of 2021 by a professional.
Last night, a neighbor came to my door to let me know my garage was leaking significant water. I went down and my entire garage was flooded (~3 inches tall). The water was flowing full force from the copper pipe attached to the T&P Valve.
After shutting off water to diagnose, I noticed the T&P valve was fully opened (by itself). Which, after much googling, appears to be unusual. It seems like when it opens and doesn't close, it doesn't fully open (from what I gather) and should only let out a moderate amount of water (not
I closed it and restored water to the house, but it still has a steady drip (once every 15-30 seconds). The drop does not increase when hot water is being used, so it seems steady.
Is it safe to assume that the valve failed? Or are there more serious concerns that I should investigate further?