1.Certificate: SRCC, Solar keymark ,EN12975,ISO,SGS,CE,CCC 2.Lifetime:15years 3.Deliverly time:10-15days 4.Best performance Specifications: 1) Water tank (interior): SUS304-2B food grade stainless steel2) manifold : aluminum alloy 3) Glass tube: new trivalent element heat tube4) solar working station5) Steel tube dimensions: 58mm x 1.8m, 47mm x 1.5m 6) Water capacity: 150L, 200L, 300L,500L 7) ...