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Repair guides and support for gas and electric hot water tanks, boilers and household heat exchangers.

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Why won't vinegar circulate while flusing tankless water heater?

Trying to flush Rheems tankless gas water heater. Turned off the gas first, then unplugged it per plumber's advice. Inlet and outlet valves all shut off. Hose connection valves on. Using a 1/6 horsepower pump. No flow of vinegar through the heater. Reversed hoses and got just a trickle. Cleaned filter, still nothing.

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@bpcammack take a look at these instructions and see if they are consistent with what you did or if not, if it works for you.

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Thanks for supplying me with this. The only thing I did differently was to shut off the valve to the outlet. Let me open it and see what happens. Thanks!

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Bruce Cammack sera éternellement reconnaissant.
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