Method for generating heat energy comprising supplying electrical energy to a heating element where the heating element heats a negatively charged cathode, electrons are emitted from the heated cathode towards a positively charged anode through a positively charged grid, wherein the positively charged grid is provided with greater charge potential value that the anode and the anode is forced to constantly generate heat energy, wherein at least part of the cathode, the positively charged grid and at least part of the anode are provided in hydrogen gas filled chamber of a container. A device for carrying out said method is also disclosed.