This Dyna-Glo™ vent-free unit is the ideal choice for safe indoor supplemental heating. It is great for use in your home or cabin. This heater does not require electricity to operate, making this an excellent choice for everyday heating, as well as emergency situations when the power goes out. This blue flame wall heater burns with 99.9% efficiency and operates on liquid propane or natural gas. Prior to placing your order, please check local and state codes to determine if vent-free heaters are permitted.