vacuum tube solar water heater 1.ISO, CE, CCC approved, 2. High quality with reasonable price ... water heater (We can customize products according to customers' requirement)1.Capacity Optional : 135L,150L,165L,200L,250L,300L,2.Working ... Piece: Stainless steel screw features of solar hot water heater:1.With high quality vacuum tubes as solar collector, absorption percentage ...