Pressurized solar water tank: economical and convenient for the household Pressurized solar water tank: Technical Specifications:1) Capacity: ... ): 2.0, 2.0, 2.5,2.57) Thickness of insulating layer(mm): 40, 40,50,508)length of sigle copper coil ... double copper coil(M) : 22, 22,26,2610) Material of insulating layer: polyurethane Pressurized solar water tank