... industry-first technology,non-pressure solar water heater tank Wide copper water tanks, no welding,Solar water heater industry-first ... heat exchanger)* Outer: Colored Steel Sheet ,Thickness: 0.5mm Inner: Copper Sheet 0.5 mm and Composite Materials Coating, Thickness: 8mm ... Heater,Mg Anode,T&P Valve,double Heat Exchanger, Sensor* Copper coil: thickness: 1mm; diameter: 16mm * Working pressure: 0.6 ...