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Old 09-18-2021, 06:14 AM   #1
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on city lukewarm water, on pump hot hot water

Her is an odd one. When on city hookup no hot water, lukewarm in kitchen, cold in bathroom. I turn on water pump then a fluctuation of warm, turn off city and 100% water pump then boiling hot. So the tank is heating, when i open the relief valve a bit its scalding. The bypass valve is cold.

last weekend boondocking with electric and all was fine. This weekend full hook ups and on electric heater and no/lukewarm hot. I then went to propane thinking maybe its the electric element. Proppian burner never came on. I turned on water pump then got a little more hot but still not super hot. turned off city at the spigot and went 100% water pump and scalding hot. Ran it for a minute and propane burner kicked on. So i think the water tank and heating elements are fine its just this weird thing on city hook up. a month ago was on full hookups and all was fine. I have changed nothing since then except RV went in for a refrigerator repair and they replaced the cooling element.

Any ideas?
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Old 09-18-2021, 10:25 AM   #2
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City water and pump discharge supply SAME RV COLD water line which then supplies cold to the water heater

SO SHOULD BE same issue city water or pump
**Pump will not start/run if city water pressure is higher then pump start pressure set point

Few questions:
City water...using a Regulator?
What pressure is city water?
Is FLOW on city water good?
FLOW better on Pump?
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Old 09-19-2021, 06:47 AM   #3
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Check winterizing by-pass valve.
Check outside shower. Make sure both hot and cold faucets are "off".
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Old 09-19-2021, 08:22 AM   #4
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So the follow up. I switched back and forth between city and pump a few times and all is well. I did check out door shower as Persistent subjected and I think (I think) the hot was open but the sprayer isn't going or anything. all the bypasses were in correct position. I didn't really do anything except run hot water and switch between city and onboard pump. Maybe there was an air lock or something.
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Old 09-19-2021, 08:48 AM   #5
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Outside shower, hot and cold faucets on

This lets the cold water and hot water mix inside the fixture. I have found this a few times on my rv too. I have a bar of soap and use the outside sprayer to wash my hands after I hook and unhook the sewer hose and forget to turn them off. It's a common deal causing the hot water to be just a little warm throughout the rv. the water connection Almost always has higher pressure than the water pump.
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Old 09-20-2021, 06:46 AM   #6
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Wow, such a small unnoticeable thing that sent me into a bit of a tail spin . Good thing to know, its a small answer to a seemingly big problem. Thanks.
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