... ,CCC,ISO,CE, Solar Keymark certificate 2. Flat plate collector solar flat panel:1.reliable,efficient,twin-glass evacuated tubes2. ... design,standard frame suitable for pitched roof or flat roof4.significant advantages over flat plate5.easy plug in installation6.improves the ... ,color steel plate,inner tank stainless steelworkstaion:circulation pump rs-15/6(wilo) ,controller SR868C8,expansion tank