... ) Inner vessel diameter(mm): 438, 542,613,6133) Water tank diameter(mm): 520, 620,710,7104)Material of inner ... thickness of shell:galvanized sheet 0.5mm6) Thickness of inner tank(mm): 2.0, 2.0, 2.5,2.57) ... mm): 40, 40,50,508)length of sigle copper coil(M) : 14,14,16,169)length of double copper coil ... (M) : 22, 22,26,2610) Material of insulating layer: polyurethane ...