Keep the worksite warm with the Mr. Heater 18,000 BTU Portable Cabinet Heater. This portable propane heater requires no electricity to operate, using a 20-lb. propane cylinder to provide up to 18,000 BTU per hour. It has a factory-installed safety tip-over switch and thermoelectric valve and a piezo push button ignition for safe and easy use. DESIGN Portable radiant cabinet heater Three different heat settings Piezo push button ignition Quiet and odorless, clean burning design Safety tip-over switch Thermoelectric safety valve Automatic low oxygen shut-off system Uses 20 lb. propane cylinder SPECS: Dimensions: 23” x 16.50” Weight: 23 lbs. Output: 6,000/12,000/18,000 BTU/hour Heating Area: 450 sq. ft. Runtime (Max BTU): 24 hours Additional Details Suitable for outdoor use only Includes hose and regulator 7,000ft. altitude restriction 1-Year Limited Manufacturer’s Warranty Style: F227500Z