We know you need your equipment to work as hard as you do. Trust Master 400000 Btu kerosene/diesel forced air torpedo heater to get the job done. This versatile, multi-fuel heater will warm up to 10000 sq-ft of your shop, barn, construction site, or wherever you need powerful, dependable heat. This high-output heater's time-tested design includes Master rigorously tested cold-start system, plus the built-in convenience and safety features you expect from Master products. Master built for power.