حول compact non pressurized solar water heater

Solar water heater Specifications:
1) Inner tank material: SUS304-2B, thickness: 0.3mm-1.5mm
2) Vacuum tube: 15,16, 18, 20, 24 ,30,36 pieces of tubes are available, over 15 years service life . Hail resistance 25mm
3) Insulating layer: Polyurethane foam, thickness: 50mm, 55mm, 60mm, 80mm available
4)outer tank materials:color steel ,thinkness :0.3mm-0.5mm
5)support:galvanize steel ,thickness:1.2mm-1.5mm