howdy,
the only downside to the raritan is cost. it is a high quality yacht hot water heater that like jimmy said uses electric and coolant heat exchanger to heat while driving.
i agree with jimmy, a heating element hot water heater will not work with your inverter. not unless you have a dozen batteries.
to put in a propane heater would require a great deal of rework. a standard small electric hot water heater would be the cheapest, but you would have to be plugged in or have the genny running to get hot water.
most of us have replaced the raritan as it does rust out over time. hang on to your wallet with it.
later
tom
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