Abstract: A method and apparatus for producing usable heat by fusion of two atoms within a vessel filled with a gas. The fusion is performed under pressure within an electric arc between two electrodes within the vessel. The electron clouds of the atoms are deformed into a toroidal shape by a magnetic field of the electric arc, thereby exposing the nuclei of both atoms. Upon such exposure, a trigger such as a sudden change in the arc or a sudden increase of pressure in the vessel forces the nuclei of the atoms to fuse, producing a new atom. Selection of the gas, the electrodes, as well as the operating power, pressure and flow through the arc results in the production of energy that is greater than the electric energy consumed by the arc. Heat produced by the fusion is used for the production of electricity or other commercial use.