Features: Built-shielded heat pump circulating water pumps host and dual high efficiency heat exchanger, heat pump water connection to the host and the tank, easy to install. Heat pump water tank insulation host can be any combination, more options, more flexible combination of adequate water. Can solar water heaters and electric water heaters used in conjunction with displacement. The mounting position is more flexible, fully embodies the humane installation. . Using electronic expansion valve, defrost more quickly to solve the slow defrosting, heating difficult common problem. Cancel tank built-in copper heat exchanger, to prevent damage caused as a result of brass also damaged water tanks and a host of phenomena. . Heating capacity and water production than high fluoride water cycle machine cycle machine.