The Pyramid Patio Heater has a single burner that equals 40,000 total BTUs. This unit has an electronic ignitor that requires one AAA battery. It's mainly made of steel, stainless steel, and aluminum. It includes wheels, cylindrical quartz glass, a protective screen that prevents contact with the heat cylinder, and a flame emitter to create a rotating fire. The fuel source is liquid propane provided by a 20-pound propane cylinder (sold separately). The product is intended for outdoor use only and should not be placed under any combustible materials. The unit carries a one-year warranty.