... , high quality economical choice CCC, CE, SABS Sunshore 18-vacuum-tube non-pressure solar water heater for 3-4 persons ... 304-2B stainless steel sheet, 0.5mmInsulation: polyurethane foam, 55mm Vacuum tube: borosilicate glass 3.3Absorption coating: Cu-Stainless steel-Al ... and 100 advanced production lines for solar water heaters and vacuum tubes, with all the key procedures controlled automatically. Our ...