Pressurized solar water tank: economical and convenient for the household Pressurized solar water tank: Technical Specifications:1) Capacity: 200, 300,400,500L2) Inner vessel ... copper coil(M) : 14,14,16,169)length of double copper coil(M) : 22, 22,26,2610) Material of insulating layer: polyurethane Pressurized solar water tank