Desa 25700 is a 150,000 BTU space heater designed for use in well-ventilated areas where temporary, portable heating is required. It's powered by kerosene or No. 1 fuel oil and features a 17°, four-blade, 10-1/32 inch diameter fan that provides instant heat. The heater has a thermostat that allows you to set the desired temperature, and it will automatically ignite and stop to maintain that temperature. The Desa 25700 is also equipped with a fuel filter to ensure clean fuel is used, and a thermal overload protector to prevent the motor from overheating.