... :ISO9001,CCC,CE,Solar Keymark solar water heater:evacuated tube pressure:non-pressuried Solar new energy:material:1 ... SUS304-2B,thickness:1.2-1.5mm,normal working pressure:0.4bar,3.dust ring gasket : ... can be operated completely automatic if connect with intelligent controller.2.Simple structure,easy plug-in ... foam with thickness 50-55mm,4.Suitable for campong area,holiday residences.5.water introduced ...