Portable Gas Torpedo Heater Fuel Type Natural Gas Propane Heating Capacity Output 750 000 BtuH Heating Area 37 000 sq ft Minimum Cylinder Size 2 000 lb Ignition Type Direct Spark Ignition Power Source Electric Thermostat Included Remote-Mounted Overall Height 30 in Overall Width 26 in Overall Depth 48 1/2 in Automatic Safety Shut-Off Included Yes Built-In Air Pressure Gauge Included No Digital Temperature Readout Included No Flame-Out Sensor Included Yes