Rock Energy Systems, LLC holds three leading brands of space heating products that include portable radiant heaters, waste oi ... l furnaces, and boilers. Our products generate heat that is fueled by motor oils and petroleum based fluids commonly used in all types of internal combustion engines. Produced in Janesville Wisconsin, Clean Burn (www.cleanburn.com), Lanair (www.lanair.com) and SunFire (www.sunfireheater.com) are the market leaders in advanced oil heating equipment and accessories. read more