Pressurized solar water tank: economical and convenient for the household Pressurized solar water tank: Technical Specifications:1) Capacity: 200, 300,400, ... Water tank diameter(mm): 520, 620,710,7104)Material of inner tank: BTC340RWith porcelain enamel5)Material and thickness of shell:galvanized ... sheet 0.5mm6) Thickness of inner tank(mm): 2.0, 2.0, ...