> It is like the heater is not always heating the water to the
> same temperature. It is a fifteen year old gas water heater.
I'd go with Jim's suggestion first, and make sure it's the water heater and
not your shower valve (or mixing valve if you have one, I never have).
Might be worth examining the burner in the heater, though, especially if
it's located near a clothes dryer. We had a leaking dryer exhaust, that
allowed enough lint to build up in the heater burner to make it erratic.
Fifteen years seems kind of short to me, I replaced what appeared to be the
original 1960 unit almost 20 years ago now, and the replacement is still
going strong. Still, 15 is old enough that I wouldn't put a lot of effort
into fixing it. Newer heaters are typically more efficient anyway.
-- Randall
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