... : economical 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 ... of inner tank(mm): 2.0, 2.0, 2.5,2.57) Thickness of insulating layer(mm): 40, 40, ... ,2610) Material of insulating layer: polyurethane Pressurized solar water tank