Portable Gas Torpedo Heater Fuel Type Propane Heating Capacity Output 40 000 BtuH Heating Area 940 sq ft Minimum Cylinder Size 20 lb Ignition Type Intermittent Spark Ignition Power Source Electric Thermostat Included No Overall Height 13 1/2 in Overall Width 19 5/16 in Overall Depth 8 1/8 in Automatic Safety Shut-Off Included Yes Built-In Air Pressure Gauge Included No Digital Temperature Readout Included No Flame-Out Sensor Included Yes LED Diagnostics Included No