... and convenient for the household Pressurized solar water tank: Technical Specifications:1) Capacity: 200, 300,400,500L2) Inner vessel ... diameter(mm): 438, 542,613,6133) Water tank diameter(mm): 520, 620,710,7104)Material of inner ... 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 ...