... :0.4mm inner tank,stainless steel SUS304-2B,thickness:1.2-1.5mm,normal working pressure:0.4bar,3.dust ring ... Nx/Cu,selective absorption coating5.frame:,aluminium alloy,1.2mm thickness6.controller:SR500advantages:1.can be operated completely automatic if connect ... hot water without sunshine.3.Superior heat preservation ensured by one-off molding polyurethane foam with thickness 50-55mm,4.Suitable for ...