Steam generators are turbines which covert water into steam and then into thermal energy. Non-fluctuating steam pressure, stable temperature and automatically balanced electrical input are features which are required in any Steam Generators and electric boilers. There are two methods of utilizing electric power to generate steam in an electric boiler or steam generator. One is to pass electric current through a metal resistance-heating element immersed in water. The metal element resists the passage of current and develops heat, which by contact is conducted to the water and finally generates steam. The other method is to utilize the water itself as the resistance element carrying alternating current between solid metal electrodes. The resistance of the water to the passage of current produces internal heat that results in rapid steam generation.

The electrode method of efficiently converting electrical energy into thermal energy has been used in the United States for more than fifty years and for more than seventy-five years in Europe and Canada. The earliest form of electrode steam generators consisted of a perforated bucket hung within a pressure vessel into which were suspended metal electrodes. A variable output pump controlled the level of the water surrounding the electrodes and consequently the flow of current and steam production.