Excellent heater for my van camper build, ran the exhaust & intake through the floor outside with high temp silicone to seal. The manual was basically useless engrish, use YouTube if you want to learn the ins & outs of the unit, but once primed and running it initially took something like 130watts, but once it was going for a bit it was only using between 8 to 10watts on lowest temps....incredible. Solid unit!