Have a DELTA 292RL
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Ok, I will take a shot at this one.
If the heater works fine when hooked to city water, in my mind it would support that you have a flow issue when using your water pump when not hooked to the city supply.
This is likely a result of the water pump cycling on and off and that is affecting the flow rate thru the heater. These heaters require a minimum flow rate to stay lite.
As a test, try opening a second faucet when using the pump and see if you get an improvement. If you do, you could have a restriction in the aireator if this condition is limited to a certain faucet.
The other possible solution is to increase the pump cut out pressure , so it continues to run during a demand, instead of cycling on and off to try to maintain the pressure.
This copy paste link was posted previously on this forum.
This is a weird one, all our 38DBL faucets get hot water when connected to city water. However, when switching to the fresh tank and water pump, the kitchen and shower faucets don't get hot on their own. We have to turn on a 2nd faucet to get hot water out of either of those two faucets. Any...
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