The solar water heating system installed for multi storied buildings, process industries, apartment complexes, hospitals, hotels. Works on the same basic principle, but is specifically designed to meet rigorous requirement of such conditions. Such installations have multiple hot water outlets at different levels of the building, it is important that all outlets should dispense hot water as soon as the taps are opened, and also minimize the wastage of cold water. To achieve this, a special device called the Electronics Control Unit is installed within the hot water plumbing lines. During the process of heating, if the temperature of the water goes below 30° C, the Electronics Control Unit (auto temperature controller) switches on the pump immediately. The pump then pumps out the cold water accumulated within the tube and fins, thereby allowing immediate flow of water.