Possibly the check valve is failing. There will be no hot water once it does. It is fairly easy to replace. Do a Search on "hot water check valve" and you should find lots of information.
You will need a wrench with a long handle for leverage. The valve is tight!
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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