Suryajala Evacuated Tube Collector solar water heater has a set of glass tube that is inserted into a well-insulated stainless steel storage tank at an angle which facilitates maximum energy absorption and Circulation. When the rays of the sun fall on the outer surface of the inner tube, the energy is absorbed and transmitted to the cold water flowing in the tube. The heated water inside the tube rises to the star age tank placed at a higher level and cold water flows in the tube from the storage tank, This circulation takes place through the process of natural .convection (Thermosyphoning) as long as the sun shines, the insulation retains the heat overnight. 

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Detailed info link: Suryajala Catalog