Electric Hot water tank also called Electric water heater, are used for creating and storing hot water for commercial or domestic use. Most high efficient insulated water tank can retain and stored hot water longer. As a result, the cost of electric consumption reduce. The difference between an electric hot water tank and a gas burning water tank is the way in which the water is heated. The gas tank relies on heat from the burner or burners which heats the outside of the water tank. As for the electric hot water tank, the water is heated by the use of an electric element. This element sits inside the water and creates heat as a result of electric voltage passing through the element, thus relying on an electrical power source.