... CE,CCC,ISO9001-2008, Solar Keymark, SRCC, SGS energy saving offer OEM Evacuated tubeDia*Length47*1500,58*1800mmTypeHeat pipe.Absorption ... tank materialSUS304-2B, thickness1.2mm,1.5mm,2.0mm. Water purity for drinking.Outer tank materialColoured plate,galvanized steel, ... 1) inner tank : imported SUS-204 stainless steel 2)outer water tank: stainless steel , colored steel, galvanized steel 3)capacity ...