1.High efficiency 2.CE,ISO9001,EN12975,SRCC 3.Deliverly time:10days 4.5years guarantee,15years lifetime Specification, features of the solar system:Specification:Inner tank material: SUS304-2B stainless steelInner tank diameter and thickness: 310mm/360mm/380mm(0.40/0.58mm)Outer tank material: import the colour layer steel plate/PVDFOuter tank diameter and thickness: 420mm/460mm/480mm(0.31mm) ...