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spencerin
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# Posted: 3 Nov 2021 11:04pm
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Actually drained it fine in the end, but had to use the relief valve. Long story, but before getting into it, is there a check valve on the hot side that keeps hot water from going back into the heater once it leaves, and if so, does it have a high PSI trigger before opening up? I know there's a check valve on the entry/cold side.
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Brettny
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# Posted: 4 Nov 2021 05:55am
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A normal tank water heater? If so you need to introduce air into the tank to get water out the bottom. You can do this by opening up a faucet to hot. How ever some times they get hard water build up in them making them slow to drain anyway.
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spencerin
Member
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# Posted: 4 Nov 2021 07:42am
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That was the problem - I had all points of use open and it wouldn't drain. I blew into the drain hose and it definitely wasn't clogged (it's new anyway), and I could only blow about a half a breath in before I couldn't anymore.
The water heater was definitely sealed off from the system, but when I last ran water, everything flowed a-ok. If an obstruction somehow entered the hot side system, I think still should've been able to get SOME air flowing when I blew into it. That's why I'm wondering if there could've been a check valve installed that allowed water to leave at a certain PSI (20, for example). From what I could find, humans can blow only 1-2 PSI. So, a water pump could open it, but a human couldn't.
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gcrank1
Member
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# Posted: 4 Nov 2021 11:45am
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Mineral deposits settle and plug the bottom of the tank.
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