... , no welding,Solar water heater industry-first technology100-800L (All copper) pressure tank 50L-800L1),Model: ZK-CCA (Copper Composite Tank without ... without heat exchanger)3),Model: ZK-CCA (Copper Composite Tank without heat exchanger)* Outer: Colored Steel Sheet ,Thickness: 0. ... 5mm Inner: Copper Sheet 0.5 mm and Composite Materials Coating, Thickness: 8mm* Tank Include:1.5/2.0 ...