When you choose a Master® propane convection heater, everyone within 1,800 square feet with feel the warmth thanks to its efficient 360° heating radius. This powerful space heater delivers long-lasting (up to 36 hours), electricity-free heat. It’s like a bonfire without the open flame—perfect for barns, large warehouses, construction sites and loading docks. As you’d expect from Master, safety and convenience are built in to this durable product. Master—built for power.