Delux 140,000 or 180,000 BTU Kerosene Forced Air Heater provides immediate relief from cold weather working conditions. It's ideal for residential, commercial and industrial (including construction site) applications. It covers areas up to 4200 sq. ft. Included are self-diagnostics, a thermostat, LED readout and cord wrap. All Delux Kerosene Forced Air Heaters are CSA certified for multi-fuel use with these fuel types: K1 Kerosene, Diesel #1, Diesel #2, Fuel Oil #1, Fuel Oil #2, Jet A and JP-8. However, K1 Kerosene is the manufacturers recommended fuel for optimal, cleaner burns and long lasting product life.