Portable Gas Torpedo Heater Fuel Type Natural Gas Propane Heating Capacity Output 950 000 BtuH Heating Area 47 500 sq ft Minimum Cylinder Size 4 000 lb Ignition Type Direct Spark Ignition Power Source Electric Thermostat Included Remote-Mounted Overall Height 39 in Overall Width 30 1/2 in Overall Depth 73 in Automatic Safety Shut-Off Included Yes Built-In Air Pressure Gauge Included No Digital Temperature Readout Included No Flame-Out Sensor Included Yes