One Source Equipment Rentals has portable temporary electric heaters for rent or sale from Heat Wagon. Electric heaters benefit over combustion heaters like kerosene, diesel, natural gas, propane because they produce no fumes (carbon monoxide) or water. This allows them to be used in small spaces safely without adding moisture. Electric heaters are safer and easier to set up than combustion heaters and don’t need to be refueled. Models range in size from 5,100 Btu’s/h to 204,700 Btu’s/h.