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Question DetailsAsked on 7/12/2016

Hot water well not come out of tank unless the cold water is coming into tank

When opening the hot water valve in the kitchen it does not allow the hot water tank to drain.
The only way we can get water to come out the drain valve is to turn on the input water pressure.

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I am not clear if you are trying to drain the water heater tank, or get it to supply hot water - sounds like the first is your case. For the second, obviously the cold water has to be on to the tank to pressurize it and provide water to replace what is coming out as hot.


To drain it (which generally has to be through the bottom drain valve), you need an open-to-air connection on the hot water piping. Some faucet designs, especially many single-handle type, use flow control elements that prevent backflow so if only hot or cold is being used the waer cannot flow back into the other line. You could find another hot water usage point - bathroom sink, tub, in some cases even toilet flushing and refilling if you have tempered water (hot and cold mixed to prevent tank sweating).


Other ways to open it up to air (be sure to tighten back down when done draining the tank) would be to loosen up the fittings on the flexible water supply line to dishwasher or washing machine, provided they are higher elevation than the the tank.

Answered 2 years ago by LCD




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