This suburban RV water heater is the next option to make our list. It runs on standard liquid propane gas, and can provide users with 12,000 BTU (British Thermal Units) of heat over an hour. The steel tank is equipped with an anode rod to absorb the corrosive effects of electrolysis, ensuring it lasts even with frequent use.
The heater is contained within one-peice, die-formed housing, which effectively protects its connections while simultaneously offering easy access for repairs. Because it’s quite simple, functionally speaking, there’s very little to go wrong – especially since it doesn’t require any electricity to operate.