Abstract: The proposed gas generator includes an isothermal vessel for a cryogenic liquid, the vessel being connected via an electrically controlled valve to a supercharging evaporator, a nozzle unit arranged in the upper part of the gasifier and connected by an electrically controlled valve to the lower part of the cryogenic liquid vessel, the gasifier being partially filled with a heat-accumulating substance and provided with a deflector situated above the nozzle unit and an electrically controlled sealing unit; in the lower part along the gasifier axis are provided a separator and a toroidal elastic casing attached to the bottom of the gasifier, the cavity of the casing communicating via the main pipe (provided with a pre-heating heat exchanger) with the upper part of the iso-thermal vessel, while the heat-accumulating substance is situated above the surface of the toroidal elastic casing, the electrically controlled sealing unit being situated at the separator outlet.