Is to cast aluminum heater tubular electric heating element for heating body, bent into various shapes in mold with centrifugal indifference into various switches, round, flat, rectangular, air-cooled, water-cooled and other special-shaped, after finishing after it is heated and close fitting, surface load can reach 3-5W/cm2, the temperature quickly, uniform heating, good thermal conductivity, long service life. This product is one of the ideal heaters at home and abroad.