300L radius of the tank fresh water solar water heater fresh water solar water heater Product Overview: the Solatube sunlight professional solar system design, http://www.bjsola.com solar collector using all-glass vacuum tube collectors, water tanks SUS304 stainless steel liner open tank, thermal insulation polyurethane foam insulation, water tank built-in the SUS304 heat exchanger coil, and a sunny day, the solar radiation energy by natural circulation heat collector gradually collected the tank, rainy days, the water temperature is not enough, you can tank built-in electrical heating system is heated to the set temperature. Reverse RHES-heat transfer technology, with stainless steel coil heat exchanger inside the tank, the hot water tank as the energy storage medium, cold water through stainless steel coil heat exchanger absorbs heat rapidly heated, 20 seconds fast heat exchanger, the water temperature close to the temperature of the water in the tank (2 ° C temperature difference), the water pressure from the municipal pressure, dynamic pressure drop of about 5 meters.