TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Component: The liquid is water and the vapor is water steam. The catalyst includes an iodine and sulfur dioxide. Preferred System: The combustion chamber is a space defined and surrounded by the boiler body and boiling chamber in the boiler and made surrounding around the combustion chamber so as to ensure the heat generated in the combustion chamber being conducted to the liquid flowing in the boiling chamber. The boiler is chimneyless. The combustion agent includes a hydrogen gas and oxygen gas, which are obtained from a dissociation of water by an electrolysis process where the hydrogen and oxygen gas are delivered to the combustion chamber and instantaneously combust in the combustion chamber to produce a blazing flame in the combustion chamber to heat the liquid in the boiling chamber. (S1) further comprises a water dissociation pool containing the water, cathode and anode disposed in the water in the water dissociation pool, and an electric power source electrically connected with the cathode and anode to form a closed electrical circuit for the water electrolysis process. The hydrogen gas is generated and collected at the cathode and delivered to the combustion chamber via the combustion agent inlet and the oxygen gas is generated and collected at the anode and delivered to the combustion chamber via the combustion agent inlet. A catalyst is added to the water in the water dissociation pool to augment a rate of water dissociation during the water electrolysis process. The hydrogen collector and oxygen collector each have an inverse tubular U-shape are disposed to surround the cathode and the anode to collect the hydrogen and oxygen gas respectively.Preferred Process: The step (c) further involves: (c1) inletting the liquid to flow around the combustion chamber; (c2) conducting heat generated in the combustion chamber to the liquid surrounding the combustion chamber; (c3) vaporizing the liquid flowing through the boiling chamber arranged surrounding the combustion chamber by the heat conducted from the combustion chamber to form the vapor; and (c4) outputting the vapor from the boiling chamber. The combustion chamber is a space defined and surrounded by the boiler and boiling chamber in the boiler is formed around the combustion chamber in a thermal-conduction manner with respect to the combustion chamber. The boiler chamber has a liquid inlet for guiding the liquid for boiling into the boiling chamber, and a vapor outlet for guiding the vapor produced in the boiling chamber out of the boiling chamber. The step (a) further involves: (a1) mixing the water for dissociation in a water dissociation pool with a catalyst to augment a rate of water dissociation; (a2) electrolyzing the water with the catalyst by a device of a cathode and anode and an electric power source connected to the cathode and anode forming an electrical circuit; and (a3) collecting the hydrogen gas generated at the cathode and the oxygen gas generated at the anode. A ratio between the water for dissociation, the iodine and the sulfur dioxide is 2:1:1 by mole. The iodine, the sulfur dioxide and a portion of the water for dissociation are regenerated and recycled into the water dissociation pool. (M1) further involves (d) driving power generating device to produce power by the vapor transferred from the boiling chamber. The step (b) further involves: (b1) condensing a water vapor product produced along with the combustion in the combustion chamber to form a condensed water; and (b2) recycling the condensed water into the water dissociation pool.