The Desa Tech 400011 is a powerful and efficient 30,000 BTU portable heater that can quickly and effectively heat up to 1,000 square feet. It features a built-in thermostat that allows you to set and maintain the desired temperature, as well as a safety control that automatically shuts off the heater if it overheats or if the flame goes out. The 400011 also has a built-in photocell that automatically turns the heater off when it senses light, making it ideal for use in areas where you want to conserve energy.