Whether you are on city water or using the pump makes no difference, as long as the check valve on the hot water outlet of the water heater tank is working. If the check valve is working, and the bypass valve, which is just an on or off valve for the cold water side of the water heater, is working, there should be no water entering the tank. Just make sure every switch and breaker for the electric side is turned off so you don’t accidentally burn out the electric element when there is no water in the tank.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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