andy
the electric heaters use the same principal of a monster burner, only it's 3 or 4 chambers with seperate elements in series so you get a continous temp rise as the water flows. If your electric heater required 30 or 50 amp dedicated service you would definately be in trouble in a RV. The only saving grace might be that your incoming /ambient water temp from the fresh tank might not require as much of a temp rise/increase to get where your hot water is hot - 140f. Most instant heaters are rated/speced by flow/gpm, temp rise/degf and energy use either btu or watts/amps. I would think that in a mobile application that a LP or diesel fired unit would be the right choice with the diesel burner having some sort of electrical requirement for the burner to operate while the LP unit could be entirly stand alone.
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