Re: 110 Water Heater plumbed to engine?
A 110v water heater will have a pressure and temperature (P&T) relief valve built into it and they all have the same ratings. You can look at the one in your home or on the 110v heater you plan to use for the rating. You will need a double wall heat exchanger iwith a pump on the water heater side. You could use a gravity circulation but I doubt you would be able to get enough height differential in the van. It would also be good to have a solenoid valve on the engine side to prevent water from entering the heat exchanger when you do not want it to. Temperature control is from the heat control slider on the dashboard.
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Current van: 2002 Ford E350 extended body camper with Colorado Camper Van pop top and Agile Offroad 4WD conversion.