The Dyna-Glo Delux EcoMax 135,000/95,000 BTU Portable Kerosene Forced Air Heater is ideal for indoor/outdoor construction sites, as well as industrial and commercial applications, making it an excellent choice for your portable heating needs. It requires minimal assembly, is 98% fuel efficient, and heats areas up to 3,200 sq. ft. The KFA135DGD-LD includes a High/Low BTU switch for adjustable heat output, 10" flat-free wheels, comfort control thermostat with a digital LED display, runtime fuel gauge, convenient cord wrap, operating indicator light and more. Save on fuel with Dyna-Glo's patented EcoMax technology, which helps reduce fuel consumption while delivering extended operation—up to 14 hours of runtime on the low setting and up to 10 hours on the high setting from a single tank. All Dyna-Glo Delux Kerosene Forced Air Heaters are CSA certified for multi-fuel use with K1 Kerosene, Diesel #1, Diesel #2, Fuel Oil #1, Fuel Oil #2, Jet A, and JP-8 fuels. However, K1 Kerosene is the manufacturer's recommended fuel for cleaner combustion and longer product life.