Compact non-pressurized solar water heater relies on the natural circulation of water between the collector and the tank.  As water in the evacuated tubes is heated, it rises naturally into the tank. Meanwhile, cool water in the tank flows down to the bottom of the evacuated tubes, making the circulation throughout the system. 

1) Inner tank: stainless steel SUS3042) Vacuum tube:Cr-AL-N/Cu (47-1500/58-1800)3) Outer tank: painted steel

4) Insulation: polyurethane 50mm/60mm

5) Frame: coated galvanized steel

6) Reflector: stainless steel

7) Inlet/Outlet Size:1/2"

solar water heater