Quote:
Originally Posted by herk7769
In my opinion:
Obviously if you are dry camping you will use the propane only.
If shore power is available, I use AC to keep the water hot and switch on the propane right before shower time. This allows faster recovery time as you have two sources of heat to heat the incoming cold water.
There is no harm in doing so since the systems are completely separate.
As to popping the relief valve, an air chamber above the hot water in the tank allows room for expansion of the cold water when you turn on the heat. If there is no place for that expanded water to go, you could add so much pressure to the water lines, your faucets or relief valve can leak.
I just open the hot water faucets to let air out when I am "de-winterizing" to fill the hot water heater and that is it.
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This is my procedure as well --- I see no earthly reason to use my expensive (in Canada) propane to heat water when I am plugged in to a campground electric power source, which I am paying for in my camping fee anyway. The exception, of course, is for quick recovery, as outlined by Herk.
Also, I see no reason to open the water heater access door and pop the relief valve, when opening the hot water faucet essentially accomplishes the same thing.
...VTX-Al