compact unpressured solar water heater(90-300L)

Solar water heater specifications: Inner tank: Food grade SUS304-2B stainless steel with optional 0.31mm, 0.35mm, 0.40mm. Outer tank: Aluminum zinc painted steel(silver, white), strong and anticorrosion effectively welded by argon arc. Or SUS304-2B stainless steel with optional 0.31mm, 0.35mm, 0.4mm thick. Capacity: 85/100/110/135/150/165/200/250/300L. Vaccum tube: 3.3 high borosilicate glass, 1.6/2.0/2.2mm thick absorption coating, dia 47mm or 58mm and length 1500mm or 1800mm, resisting 25mm hail. Tube quantity: 12/15/18/20/24/30/36pcs. Heat insulating layer: Imported polyurethane integral foaming with 55-75mm thick. Bracket: Galvanized steel with 1.5mm thick. or Stainless steel SUS304 with optional 0.31, 0.55, 0.88, 1.10mm thick. Fasteners: Stainless steel screws. Seal: Imported silicone rubber polymer. Temperature: 45-95 degree centigrade, temperature is over than 40-55 degree in winter Heat preservation: 72hours Hail resistance: 25mm Working principle: The selective coating on the inner cover of the evacuated tubes converts solar energy into heater energy and water in evacuated tubes the heat. When temperature rises along with density drops, and weight goesdown, hot water will go up to exchange with cold water in tank. In this way, the temperature of the water in tank goes up.