No electricity? No electricity needed with the Sengoku KeroHeat portable convection kerosene heater. Using 1K clear kerosene this cylindrical fire chamber is capable of blasting 23,500 BTUs over a 900 square foot room. And with a 1.9-gallon capacity, it will maintain these levels for 12 hours too. KeroHeat units can be invaluable as emergency heat sources, plus serve the everyday functions of heating industrial or shop spaces, or basements in homes where mamas refuse to turn the heat up higher than 65.