1.Certificate: SRCC, Solar keymark ,EN12975,ISO,SGS,CE,CCC 2.Lifetime:15years 3.Deliverly time:10-15days 4.Best performance Latest solar keymark list:SCM12-58/1800-02SCM15-58/1800-02SCM20-58/1800-02SCM25-58/1800-02SCM30-58/1800-02Specifications: 1) Water tank (interior): SUS304-2B food grade stainless steel2) manifold : aluminum alloy 3) Glass tube: new trivalent element heat tube4) solar working ...