Non Pressure Series

Non-pressurized solar water heater is a kind of solar water heating system that solar collector and storage water tank are connected together, water tank on the top and collector panel on the bottom. It relies on the natural circulation of waters between the collector and the water tank. As water in the vacuum tubes is heated, it rises naturally into the tank, while cool water in the tank flows down to the bottom of the vacuum tubes, causing circulation throughout the system. It is a simple and safe solution to get heat power from the sun.


    • Cheap and reliable solution, Simple structure, Easy installation
    • High efficiency
    • Withdraws water by gravity, working pressure no more than 0.1MPa
    • Operates without any power supply
    • Optional Electric heater can be applied, 1500W,2000W or 3000W
    • Hot water can be used directly, or can be used as a pre-heat.


  1. Inner tank:0.4mm thickness SUS304 stainless steel
  2. Vacuum tube: QB-AL-N/AL-47-1500/58-1800
  3. Outer tank:0.4mm thickness painted steel or PDVF
  4. Frame:1.5mm thickness coated galvanized steel
  5. The material of insulation: 55mm thicknesspolyurethane foam
  6. Tube coating: Cu-AL-N-AL
  7. The reflector: aluminum alloy plate/stainless steel (optional)
ModelNo.Of TubesTube SpecificationTank Capacity

Types of Tubes In Non Pressure Series

Non Pressurize Units are available in the following tube sizes

  • 47mm x 1200mm
  • 47mm × 1500mm
  • 58mm x 1800mm
  • 58mm x 2000mm
  • 70mm x 2000mm