This convection-style kerosene heater has a 23,800-BTU output, the largest heat output of any portable indoor heating appliance not requiring electricity. The no lift heater chamber minimizes startup odor when lighting the unit. Heats approximately 1,000 sq. ft. Includes easy-install safety cage and drip tray. Easy to assemble. Projects heat in a 360 degree radius. 2-year warranty.