This Dyna-Glo™ vent-free unit is the ideal choice for safe indoor supplemental heating. These heaters are great for use in homes, cabins, or garages. Since these heaters don't require electricity to operate, they're an excellent choice for everyday heating, as well as emergency situations when the power goes out. This infrared wall heater burns with 99.9% efficiency and operates on liquid propane. This heater is not available for sale in California or Canada. Please check your local regulations on installation restrictions before purchasing.