Features: 1.heat collect plate core: copper-aluminum compound or all copper. 2.flowing tube: copper with f11mm 3.head tube: copper with f25mm 4.coating: black chrome or selective adoption, 5.has a long service life. 6.surface glass: tempered glass with 5mm 7.thickness ,has high translucent,tightly for long time. 8.the aluminum alloy frame with electricity paints ,with a beautiful shape ,a strong ante-corrosion. 9.treated with special heat preservation ,use rock wool as preservation material. 10.back steel plate: hot zinc steel plate. 11.work pressure: less than 0.6 mpa. 12.inner tank: SUS304-2B stainless steel with 0.4mm thickness. 13.outer tank: SUS304-2B stainless steel with 0.31mm thickness. 14.with a group of copper coil: f12mm ,1mm thickness 15.package: export carton