No hot water

[OLYLEN]

Must be the check valve on the hot water tank sticking. When you flush the toilet you drop the pressure in the whole water system with the hot water tank included and the lower pressure releases the check valve. Turning the cold water on for a time should do the the same reset of the valve or turn off the water pump open a cold water valve should also do the reset.

LEN

[mlhrad]

I have water on both sides when bypass is used. It only happens when bypass is open.
If it's the check valve can it be cleaned or does it need to be replaced……or is it really needed?
The heater works for even after eight years?

[Elf111]

That check valve is part of your bypass, without it or a shutoff on that line you will not be able to winterize the hot water lines without filling the heater with antifreeze. I can't imagine it would cost very much to replace it or you could take the insides out of it and put a manual shutoff in that line so it can be closed for winterization.

[gemini5362]

Originally Posted by OLYLEN

Must be the check valve on the hot water tank sticking. When you flush the toilet you drop the pressure in the whole water system with the hot water tank included and the lower pressure releases the check valve. Turning the cold water on for a time should do the the same reset of the valve or turn off the water pump open a cold water valve should also do the reset.

LEN

Not sure I understand the logic in this. The check valve should be on the output side of the water heater. if there is no water in the faucets the pressure should be zero. If the water pressure is dropped because the commode is flushed it still will not drop below zero in the water heater it will have the pressure from the cold water input. Whatever the lower pressure flushing the commode will give that is still higher than the zero in the faucet.