1.Outer tank: SUS304-2B stainless steel

2.Inner tank: SUS304-2B or 316 food-grade stainless steel  thickness≥0.4

3.Sealing Ring: Excellenrt Silica gel material. life is twice longer than common Silica gel.4.Vacuum tuber: High-efficient  vacuum tube High-Efficient heat-collection function: New generation o vacuum tubes, use molecular nanotechnology, greatly enhance heat-absorption by 20 percent, higher water temperatures.Adopts the international advanced film-coating technology, solar thermal conversion rates extremely high, absorbing heat even if the cloud weather.Vacuum tube strictly choose high-borosilicate glass 3.3 so that it has low coefficient of hermal expansion and higher intensity. Hail-resistance:25mm

5.Insulation: 55mm polyurethane  keep heating  do with aging  the cell

is small and uniform  reasonable density excellent insulation

6.Frame: thicker stainless steel  , Anti-corrosive.and Anti-ultraviolet, installed in the slope and flat place freely.Strengthen hail-resistance. Angle 20-80 degree.Through oxidation process.It increase wind resistance.