Separated solar water heater

The invention discloses a separate solar water heater, comprising solar heat-collection pipe, water storage tank, connecting pipe set between them, water inlet pipe, water outlet pipe of water storage tank, water outlet pipe of water pump, electromagnetic directional valve, water pump and electric control system. The solar heat-collection pipe is irradiated by sun and the temperature of water in it rises. When the temperature difference between the water in solar heat-collection pipe and water storage tank is increased to certain values, water pump and electromagnetic directional valve are electrified at the same time, cool water in water storage tank is pressed into the solar heat-collection pipe and hot water in the solar heat-collection pipe enters into the water storage tank so as to compensate the space of pumped water to form a cycle. When the temperature difference between them is decreased to certain values the current for water pump and electromagnetic directional valve are cut off. By above mentioned procedures the water temperature rises continuously. When hot water is used water pump and valve are opened.