The DV21 direct vent gas heater requires no electricity. With up to 18,000 BTU"s per hour, it is designed to heat a space up to 330 Square Feet . This unit mounts on any outside wall for direct venting, with automatic shutoff and a thermocouple safety valve allowing it to be used safely in any room in your home. The matchless piezo ignition makes lighting easy and the built-in thermostat with one dial control is simple to use. Heat outlets are on the front and top of the unit, allowing the cabinet to remain cool to the touch. All required installation materials not included. Includes Direct Vent pipe and wall thimbles for typical Installation. Approved for use in mobile or modular homes.