[Shop-talk] Water heater problem

[Rich White]

Periodically our water heater does not get the water very hot.  Most of the
time, the first shower of the morning is nice and hot even requiring some cold
water to be added to the mix.  Sometimes it is only warm with no cold water
added.  It is like the heater is not always heating the water to the same
temperature.  It is a fifteen year old gas water heater.  Any ideas what to
look for?
Rich White St. Joseph, IL USA
'63 TR3B TCF587L
That ain't a scrap pile, that is my car!