solar water heater : certification:ISO9001,ISO14001,CCC,CE,Solar Keymark solar water heater:heat pipe tube pressure:pressuriz solar water heater: material:1.volume of storage tank ... inner tank,stainless steel SUS304-2B,thickness:1.2-1.5mm,normal working pressure:6bar,test pressure ... operated completely automatic if connect with intelligent controller.2.Simple structure,easy plug-in installation,can be ...