... water heater 3.8KGS copper coil inside water tank Pre-heated solar water heater (pressurized solar ... : 1) Inner tank: SUS304-2B imported food grade Stainless steel, thcinkness:0.31mm. 2) Vacuum tube: 58mmx1800mm, High ... borosilicate glass, vacuum tubes, 3) Outer tank: Pearly steel plate,Galvanized ... heated solar water heater(CE, CCC, ISO9001:2000)