Once the pilot light is lit and the heater control circuit board detects a flame at the flame sensor, the gas mode thermostat starts and stops the flow of LP gas to the burner, where it is ignited by the pilot flame. There is a manual valve that must be set to the “Pilot” position to light the pilot and then you move the valve to a Run position for continued operation.
The most basic model gas RV water heater has a pilot light which must be lit manually with a match or sparking device. There is no need to turn the heater off when not in use. The heater element cycles on & off as needed, heating the water, just like your home water heater. When you switch on the Electric mode on your RV water heater, the Electric Mode thermostat controls whether 120v power flows to the electric heater element or not. You can switch it off temporarily (the water will stay hot for some time) or change over to LP Gas mode.
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