Originally Posted by Bilcin
My 6 gallon water heater does not keep the water hot. the pilot is working, when I increase the temperature on the thermostat it fires up and heats up the water. After that it will not fire up again. Could it be a faulty thermostat?
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Do you have your winterized bypass valve open?
It is the valve between the cold water in and the hot out.
This can make the water cooler.
Here is a basic picture of what you should be seeing.
If the handle is in line with the hole it is open.
If the handle is cross the line it is closed.
Your valves should be like the top picture for normal use.