... years warranty Solar water heater frame Material of Model:1.the heater pipe is made of red ... .frame:aluminum alloy,thickness:2.0mm4.water tank:color steel plate thickness:0.5mm outertank,and ... inner tank stainless steel 304-2B,thainless 1.5mm,normal ... bubble and has a good effect of temperature preservation Model: tank capacity: 150L,200L,250L,300L,400L,500L,600L, ...