We checked the Consumer Reports reviews and bought the 2nd-highest rated heater two years ago. It's our 3rd or 4th heater, and has worked the best of any of them. It'll keep us warm down to about 40 degrees.
FYI: Our electric space heater is on a circuit controlled by the energy management system, so when the total amp usage of the coach gets too high, that heater circuit is the first one to dump - usually because the microwave and water heater are also running. We rarely run the propane furnace unless dry camping.
al