A fourth-generation collector solar collectors - heat pipe vacuum tube solar collector, sunlight into heat. Collector probe the temperature higher than the temperature TC circulation loop of a water outlet temperature TR settings, the controller started circulating pump running. The circulating pump in circulating refrigerant circulating in the pipeline. Through the heat exchanger will be collected by solar collectors to heat transfer in heat storage tank. The circulating pump running, when temperature difference is less than a set value, the circulating pump will stop working. When the water temperature TR achieve maximum temperature setting, the controller closed circulation pump. The electric auxiliary water heater can automatically maintain a constant water temperature for the upper settings.