We use this heater, it works great cause it has a thermostat, it's pretty heavy duty, it has a fan, and it's best feature is that it has a switch for 750/1500 watts. We can put it on 750 during the day when we need more power in the RV and at night we can switch it to 1500 when it's colder and we aren't using near as many Amps. Even on 750 watts it makes a big difference.