... :non-pressuried Solar new energy:material:1.volume of storage tank:120L,150L,180L,240L,300L2.non-pressurized water tank: ... ,selective absorption coating5.frame:,aluminium alloy,1.2mm thickness6.controller:SR500advantages:1.can be operated completely automatic if connect ... with intelligent controller.2.Simple structure,easy plug-in installation,can be ...