The best portable heaters for emergencies are small propane and kerosene heaters. A gas catalytic heater is another effective option for portable heating. Adequate ventilation and air supply must be considered when using any of these heat sources.
A portable propane heater uses small propane containers designed for camping, or can be attached to a large 20-pound tank. A propane heater can provide adequate heat for enclosed areas approximately 500 square feet or less. Modern kerosene heaters can heat a small home, and they are designed with a shutoff system in case they tip over. Gas catalytic heaters use natural gas and a ceramic heating element.