SUNWORLD Vacuum Tube Heat Pipe Compact Pressurized Solar Hot Water Heaters Range from 100L to 300L for domestic application.Cheap and high efficient Feature:1)Tube:Borosilicate Glass 3.3. dia.58mm,length 1800mm.2) Inner tank: stainless steel 304-2B,thickness: 1.2mm, diamter: φ365mm.3) Outer tank: Galvanized/stainless steel,thickness: 0.50mm, diameter: φ470mm.4) Bracket:stainless steel or Aluminium x thickness: 1.2mm.5) Insulation layer: Polyurethane foam x 52.5mm;6) Copper heat pipe inside.Specification: