... ;life:15 year3.frame:aluminum alloy,thickness:2.0mm4.water tank:color steel plate thickness:0.5mm outertank,and ... : 150L,200L,250L,300L,400L,500L,600L,700L,800L............solar water collector1) Reliable, efficient, twin-glass evacuated tubes2) Red copper ... Insulating layer,compressed rock woolHeat Pipe pure red copper TU1+water,transfer power>=150W,Working pressure,4Mpa,welding pressure 4MpaDust ...