This indoor kerosene heater is a safe ideal choice for supplemental heating, offering 10,500 BTU's. This is great for use in home, basement, garage, or at the cabin, heating up to areas of 525 square feet for up to 13 hours. No electricity required (batteries included), they make an excellent choice for both everyday zone heating as well as for emergency situations when the power goes out. Indoor kerosene heaters use ONLY 1 K kerosene, burn with 99.9% efficiency, and operate with a push button on and off design. Replacement wicks are available, model number B1319415.