I just purchased a 2006 Fleetwood Santa Fe and have only had it out once so far. I wasn't able to light the water heater, but after doing some reading online it looks like I just need to leave the pilot on for a few minutes before lighting to get the propane flowing. When reading the directions, it says to make sure the water heater is full before lighting to prevent damage. If the holding tank is full, is it safe to assume the pump has filled the water heater up or is there some way to check and verify that it's full? We won't typically be hooked up to a water source but it holds 20 gallons and six more in the heater. Also, does lighting the water heater also enable the furnace? I read that the furnace needs both propane and power to operate. If I'm not connected to electrical hookups, will the furnace draw a lot of power from my 12-volt battery? Thanks for your responses!