Hi - I have an AO Smith GVR-50-300 Natural Gas Water Heater (About 18 months old). It has a more modern Honeywell thermostat with an occasional flashing red LED that I believe indicates everything is working OK. I live in Arizona and the tank is in my garage.
I have had a problem where the hot water temperature from the tank changes drastically throughout the year. For example, last week my hot water temperature was about 125 DegF.
This morning, the temperature was 102 DegF (Of course, I hadn't changed the thermostat between the two readings).
It seems like the hot water temperature actually goes down as the exterior temperature goes up.
Shouldn't the temperature be more consistent? I have to adjust the thermostat about 6 to 10 times throughout the year to keep the temperature in the 120 => 125 DegF range.