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  Detailed product description: Use method of the automatic controller: The automatic controller are microprocessor based temperature differential temperature gathered from the solar collecting panels and the storage tanks. If the differential temperature is reach the programmable temperature difference, the circulation pump starts, and when the differential temperature approaches to zero, the pump stops. The controllers display two real time temperatures (one is inside the solar heat collecting panel, another is inside the storage tanks. It has one system clock and three programmable timers, which can be used to automatically control auxiliary electrical heater in the storage tank in case of need.The main functions are as follows: real time display of collector temperature and the storage tank temperature with system clock;There are four digital highlighted displays. The display form is ** **. Normally the controller displays only two temperatures. First two letter