I suspect constantly heating a cooling the tank of a water heater could reduce it's life because you could be stressing the metal and glass lining which will cause more cracking and metal fatigue. We never turn off the water heater except if we are going to be away from the rig for more than a couple of days.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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