Heaters come in all types, sizes and fueled by different sources. There are portable heaters and stationary heaters that are fueled by either kerosene, propane, natural gas or electrically. Ceiling fans, pedestal floor fans, or wall circulator fans can help in circulating the heat in a given space. Sizing the proper heater to a space is important in order to experience the most benefit. Heaters are rated in BTU's (British Thermal Units). Industrial Fans Direct carries quality heaters from well know manufacturers.