It Is Clear That Copper Elements Enable More Heat Transfer Within Hot Water Cylinders As One Of The Most Efficient Heat Conductors, Giving Rapid Hot Water And Eventually Saving The Consumer Money.* Iron Corrodes In The Presence Of Water, Whereas Copper Does Not. While Iron Is Impacted By Temperature Changes, Copper Is Not.* This Makes A Copper Element A Good Choise As An Replacment In Your Geyser.