[TAKPAK]

I deal with commercial units, but have also done home units as well. For the RV, you would not be able to fit an electric one in without major modifications. Electrics also do not provide as much GPM flow as gas units, simply because the electrics don't have the BTU capabilities, for a given size. The BIG drawback on an electric would be the power required. It would take the entire service at your "post" (if it's a 50 amp) to run the electric. By virtue of this reason, you won't see many electric units installed. For the gas heater, you could have one installed, but again it's going to take some modification. It will also take considerable gas (propane) while you are using it. Simply, if you retain your existing electric heater as is, you can use the "park" power. If you put in a gas unit, it's your $$$ in propane you are using. It IS a good idea for residential and commercial, but for RV's, it is still pretty much personal choice as to what you want to do, but from the economic aspect, there is nothing to gain at this point in time. Technology will change, and someday, maybe........???

Hope that helps.

FYI, I installed an electric unit for a commercial building with just two, 2.5 GPM showers for the "joggers!". It is a 480 volt 3 phase unit measuring 4 feet tall, 4 feet wide, and 8 inches deep, and requires an 80 amp circuit to power it.