... 2.Outer tank :Galvanized Steel 3.Bracket:Galvanized steel 4.Al/N/Al/Cu/SS Integrated Pressurized Solar Water ... [1.5mm]Evacuated tubeBorosilicate Glass 3.3 Specifications:1) Pressurized tank: working pressure 6bar, max resistance 12bar2) Copper heat ... , easy installation8) Warranty: 5 years9) Optional accessories: assistant tank, electric heater, reflector ,automatic inlet water valve, Magnesium anode ...