This rugged 110V AC electric heater with built-in thermostat keeps the cabin warm on the chilliest of nights. Equipped with 3 settings (600, 900, and 1500 Watts) to customize your heat output and circulation. The anti-freeze setting ensures air temperature remains above freezing. Steel construction. 11"L x 9-1/2"W x 4-1/2"H. 5-year warranty. Heavy-duty steel construction Anti-freeze setting 5-year warranty | True North Deluxe AC Electric Heater