Specification:

1.         Manifold (interior): red copper;

2.         Manifold (exterior): aluminum alloy;

3.         Insulation: rock wool;

4.         Glass tube dimensions: 58mm x 1.8m / 47mm x 1.5m;

5.         Coating of vacuum tube: ALN/AIN-SS/CU OR AL-N-AL;

6.         Heat preservation: 72 hrs;

7.         Hail resistance: 25mm;

8.         Heat pipe : anti-freezing > -35 degree