Sunpower - Model SPB-58/1800-20 -Green House Heat Pipe Pressurized Solar Water Heater

It is suitable for the flat roof and the slope roof.The support material: Aluminum alloy or stainless steel. Manifold Casing Material: Stainless steel or Aluminum. Insulation: Rockwool. Hail resistance: 25mm. Heat-pipe vacuum tube: Three target tube with the SS-C/CU selective coating. It can endure 0.6Mpa high pressure. When one vacuum tube is broken, it still can work as normally. High efficiency: >64.9% in summer and >45% in summer.