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    Navien NPE-240S2 pressure relief valve

    @John Gayewski Thank you for your insight. I read up on water hammer and now have a better understanding of the physics involved. I will take more care in the future. Given that I "flipped" the switch fairly quickly, it seems that the pressure spike could have potential been in the 500-1000 PSI...
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    Navien NPE-240S2 pressure relief valve

    This might be a stupid question, but just wanted to ask in case I did something really bad. My Navien was installed last year, and I was doing a maintenance for the first time. Everything was going well until the very end. After running vinegar through the unit for 45 minutes, I opened the...
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