heat pipe pressurized solar water heater We are manufacturer of solar water heaters in China. We have different models, for further information please feel free to contact us. Products specifications The detail of material Inner tank: SUS304-2B stainless steel Outer tank: color steel Insulation: Polyurethane foam Vacuum tube: vacuum tubes with red copper pipes Bracket: galvanized steel Products parameter TypeVacuum tubeTank Volume(L)Loading Qty20’/40HQØ(mm)Length(mm)Qty(pcs)58×18005818001613042/1065818001815039/975818002016035/895818002420029/745818003025025/62