Sterling is one of the world’s foremost manufacturers of high-quality finned-tube heating elements and enclosures, as well as one of America’s largest producers of residential baseboard heating products through several well-known brands, including Suntemp Baseboard Radiation. All baseboard elements are made in the U.S., and mechanically bonded by expanding the copper tube to create a tight bond between it and the collar of the aluminum fins, a process exclusive to Sterling products.