Working principle:
The all glass evacuated vacuum tubes as the heat-absorb element, the high vacuum degree of the clearance between the outer and inner tube can reduce the heat emission which caused by convection and conduction to a very low level. All glass evacuated tube transfer the sun energy by the high absorption rate and low emission rate of layer films, depend on the difference density between the hot water and the cold water, a cycle be created in the tube which hot water ascending and cold water descending status. Keeping natural circulation like as, the water in the tank will be heated.

Advantages
1, CE, ISO, CCC etc. Certificate.
2, 20 years experience.
3, high heat efficiency.
4, stable capacity for delivery.

Material:
1, Outer tank: Al-Zn Coated steel sheet or colorful steel. Thickness 420mm
2, Inner tank: Food grade Stainless Steel sheet SUS 304-2B, 1.5mm thickness, sanitary water for health
3, Insulation: Polyurethane foam
4, Vacuum tube: Borosilicate glass 3.3 diameter: 47*1600, 58*1800
5, Absorption coating: AL-N-AL or Copper/ SS/AL
6, frame: Aluminum alloy/Galvanized sheet.