... ,ISO14001,CCC,ISO,CE, Solar Keymark certificate 2. Flat plate collector solar flat panel:1.reliable,efficient,twin-glass evacuated tubes2.red copper ... be highly competitive.model:150L,200L,260L,300L,400L,500LMaterial:flat panel:copper material,cooper cover coating of blue titanium which made ... ,inner tank stainless steelworkstaion:circulation pump rs-15/6(wilo) ,controller SR868C8,expansion tank