Each heater (gas & electric) has it's own thermostat. As cold water enters the tank, it is most likely that both will be turned on. As the water comes to temperature, each thermostat will be satisfied & turn off. Think of it as a turbo-charge for hot water.
The manufacturer approves allowing both methods simultaneous
Now why pick one method over the other?
* If you are in a campground where electric is provided.... why use your own propane?
* If you are cold-weather camping & no electric but can run generator, you may want to conserve propane for heating your coach - use electric from generator to heat water.
* If you are in a campground w/o electric, & with quiet hours, the propane heater will serve well.
* And finally (& most common for me), if you were being a tight-wad by turning the water heater off during the night & suddenly wife yells "THERE's NO HOT WATER!" - uh oh, turn both on & distract her for 5 minutes. Ha Ha.
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