Tank:

1)Inner tank material: 0.4mm thickness SUS304-2B food grade stainless steel

2)Outer tank material: 0.4mm thickness  pearled steel

3)Diameter of inner tank: 360mm

4)Diameter of outer tank:470mm

5)Insulation layer: 55mm polyurethane foam

6) Heat preservation: 72-80 hours

Vacuum tube:

1)Dimension:length 1800mm  diameter 58mm

2)Tube coating: AL-N-AL

3)qty of tube:36pcs

Bracket:

1)material: aluminum alloy or galvanized steel

2) Obliquity of the bracket:   38 degree or 45 degrees

3)life-span:15 years

Features:

1) High cost-effective:the price is low ,

it is the best choice of low-incom and middle-income family 

2) Whole stainless steel material:never rust and anti-erode

3) High absorb efficiency: >92% low emmissive rate:<10%

4)Freezing resistance

5)Every vaccum tube is individual.It is easily replaced and 

 doesn't affect the normal working of solar water heater when damaged 

6)easy installation 

7)Warraty:5years for fram and tank, 10 years for vacuum tube