... header; 7) Aluminum frame; 8) Powder coated (black, brown or silver) aluminum casing; 9) Stable solar conversion ... the water in the tank is gradually heated.Solar Collector Technical Specification: Manifold Casing Material: AluminumFrame Material ... 355*275CertificateEN12975-SOLAR KEYMARK,SRCC,EN12975-SOLAR KEYMARK,SRCC,EN12975-SOLAR KEYMARK,SRCC,EN12975-SOLAR KEYMARK,SRCC,EN12975-SOLAR KEYMARK,SRCC ...