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Originally Posted by A Salt Weapon
I don't have anywhere near 22yrs plumbing but I have never seen an exploded w/h either. I have come across a dozen or so failed t&p. Tankless just use a pressure relief w/o temp valve, so I guess in theory a person could accidentally put one in a standing w/h.
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Never seen a pressure only relief valve either. Every tankless heater I've ever installed comes with a T&P valve
When a T&P fails, most times it starts to leak eventhough the WH is working as it should. When elements go bad they tend to super heat the water then blow out causing less or no hot water. 99% of the time the water does'nt get hot enough to set the T&P off