Hello again!
Some others may chime in, but you shouldn't turn on the 110v heating element without filling the water tank first.
But, try it on propane first:
1. Turn on the propane tank.
2. Purge the air in the lines by lighting the stove for a few seconds (or minutes?).
3. Make sure the hot water tank is full of water:
To fill (from holding tank) turn on a hot water valve at a faucet (with pump on, of course) until the sputtering stops. You can verify the tank is full by opening the pressure relief valve at the hot water heater.
4. Check bypass valves. They can be located under the driver's side dinette seat. The hot & cold valves should be parallel to the water lines. The Bypass valve (located on a line t'd between the hold & cold lines) should be "off" (or perpendicular to the bypass line).
5. Turn "ON" the hot water switch under the kitchen sink. Assuming you have power (12v or 110v) you should hear the igniter trying to light the propane. If it is quiet enough you can hear the click-click-clicking of the igniter followed by the whhoooosh of propane being ignited in the heater's burner. The red light next to the switch will turn off once the unit is lit.
I'm a newbie myself. RPod vets, how did I do?
-B