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Not maintaining temperature

by Mike
(Lewis center, oh)

We just had our hot water heater replaced under home warranty but the new Rheem 75 gallon gas unit doesn't maintain temperature during a 5-10 minute shower--we have to continually adjust the shower valve until its almost completely cranked over to hot 100%.

Can't remember the make of the previous unit but it didnt do this--they were the same size. I've adjusted the thermostat to see if that solved it--but it hasn't. Suggestions? Nothing else changed--same location, plumbing, etc. also, we're noticing the exhaust fan on top of the unit will remain on at times for many minutes--have to go to basement and turn blower switch off to get it to stop, then turn it back on and it stays off...


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