1. Efficient super conducting heat pipe, efficiency of heat transmission over 95%. 2. Conduct heat very quickly, over 1000 times of the speed of copper to conduct heat. 3. No water goes into tubes, no incrustation, no freezing. 4. Inner water tank applies food grade SUS304 stainless steel. 5. Environmental 55 mm thickness polyurethane integral foaming without Freon. 6. Outer shell : Aluminum and zinc, fluorocarbon silver plating. 7. Bracket : this bracket is designed into adjustable style. People can change its angle when they install machine. Material is high quality color steel. 8. Intelligent controlling system : can feed water automatically according to the water level that you set, and start electric? heater backup according to the temperature you set..