I can remember when a dual gas/elec water heater was a fancy upgrade. But now, it is a very stripped down model that would have gas only. Would only be a few buck cheaper, plus some extra labor and wiring to install.
Units that focus on the dispersed style camper might leave out the WH AC. No use for it without an E hookup.
As far as kits, yes they are available, but make sure you are up to the task of getting AC power into the water heater cabinet. It can sometimes be a lot more work that just dropping the kit in your online shopping cart.
As for us? The AC is pinned OFF and we never use it. Water heater stays on whenever we are in camp. Turn it off when we are away, for safety reasons.
