On/off power switch. All steel cabinet and fuel tank. Flame out shut-off. Overheat shut-off. U.L. listed. large capacity motor. Air flow is 520 CFM. Built-in thermostat. Multi-fuel use (i.e. kerosene, diesel no.1 and no.2, JP8 and Jet A fuel). Heats up to 3000 sq. ft. 125000 BTUs.