SUNWORLD pressurized integrated heat pipe vacuum tube solar water heater range from 100L to 300L for domestic application.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: 0.5mm, 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.