... the water in the tank is gradually heated.Solar Collector Technical Specification: Manifold Casing Material: AluminumFrame ... Material: Copper Heat Pipe Material: Copper Insulation: Rock Wool Rubber Seals and Rings UV Stabilized High Temperature ... 355*275CertificateEN12975-SOLAR KEYMARK,SRCC,EN12975-SOLAR KEYMARK,SRCC,EN12975-SOLAR KEYMARK,SRCC,EN12975-SOLAR KEYMARK,SRCC,EN12975-SOLAR KEYMARK,SRCC ...