Utilizing high efficiency, environment protecting working substance. World top brand compressor for heat pump main unit—Copeland Scroll Compressor. Special heating zinc coating casing with UV resistance surface painting, anti-corrosion above 20 years. Smart micro computerized defrosting system, totally solving making heat problems in winter. Making use of technologies of wide operational mode, medium temperature and low pressure, large air and heat control, highly increasing heating efficiency; Above 32% energy saving efficiency comparing with other common electric water heaters under low temperature environment use. Circulating heating & instantaneous heating available, reducing project cost. Thenewest generation electric control system: Strong and complete project necessary smart control system, no needing specialist management Suitable for the places demanding for daily hot water central supply such as hotel, public bathhouse, hospital, sanatorium, school, health club, beauty salon ect. The best choice wins to coal/ oil boiler nowadays.