SunFire Radiant Heaters SunFire heaters use state-of-the-art infrared radiant technology to produce 150,000 BTU鈥檚 of instant portable heat for any indoor/outdoor application. Unlike traditional heaters that use a 2-step heat transfer process, the SunFire will warm people, equipment, and objects directly through infrared waves of heat that are completely unaffected by wind making it the perfect choice for outdoor heating requirements during inclement weather. Comes standard with heated fuel filter for easy start up in cold conditions. Although it burns diesel fuel and needs a 120V power source, the SunFire does not have an engine and is quiet, odourless, and smokeless with emissions so low they fall well below OSHA standards for indoor emissions. Just one unit has the power to heat at least 3500 sq. ft. and comes ready for thermostat use. It can run on a generator or pick-up truck with 800W pure sine inverter. It鈥檚 the only heater of its kind built rugged tough in the USA.