... pressurized 3.10 years warranty Solar water heater frame Material of Model:1.the heater pipe is ... Nx/Cu selective absorption coating;life:15 year3.frame:aluminum alloy,thickness:2.0mm4.water tank: ... weight - easy to transport5) Attractive design, standard frame suitable for pitched roof or flat roof6) Reliability and ... P<=5*10-4,Service Life,10 years Mounting FrameAluminum Alloy,Thickness,1.8 mm, not have ...