We have a Rheem Warrior gas water heater, Model# 71-40D B. Our hot water fluctuates over periods of minutes. I can start a shower in the morning, have hot water for 5 minutes then it goes cold. Minutes later my partner can start a shower and have hot water for 10 minutes before it goes cold. There is no rhyme or reason to the lengthy of time the water will stay hot or how many minutes it takes to send hot water again. There are no other faucets drawing hot water during these times. Is there a place I can start looking to address this problem? I'm not sure whare to start. Thanks!
You could start by seeing if the thermostat is wide open. Sounds like it is on low or vacay mode. How far is the run between your heater and the bathing area. Might need to insualet some piping.
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SOURCE: rheem tankless water heater error code C4 13??
check diaphrapm valve or micro/switch best of luck
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