This Comfort Glow direct vent gas wall heater provides comfortable, clean heat when and where you want it. The gas flame is completely sealed inside away from all contact with room air. Doors and windows stay closed because no room air is used for combustion. This dual fuel heater operates on Natural Gas OR Liquid Propane (LP), provides up to 11,000 Btu's, and heats approximately 350 sq. ft. The automatic thermostat allows you to conveniently control the room temperature. Great for power outages or winter emergencies, as no electricity is required to operate. No chimney required, as this heater mounts directly through the wall. The included FREE professional vent assembly adjusts to fit walls from 4.5 to 10 inches thick. The convenient top viewing port allows you to easily view the enclosed flame. Color: Gray & Black.