A water purifier comprising: a water flow conduit (15) that allows purified water to move through it； a gas storage unit (20, 21, 22a, 22b) that allows the gas to be stored； a gas flow conduit (25) that allows gas to flow from the gas storage unit； an ice storage tank (50) that exchanges the heat of the purified water provided through the water flow conduit (15) with ice water to allow the discharge of cold water； and a mixing tank (40) that allows cold water that has cooled in the ice storage tank (50) to mix with the gas received through the gas flow line, characterized in that an evaporator (52) to cool the ice water housed inside the ice storage tank (50) is provided in a top portion of the interior of the ice storage tank (50), a purified water heat exchanger (55) that serves as a Flow path of purified water supplied through the water flow conduit (15) is provided in a lower portion of the interior of the ice storage tank (50), the evaporator (52) is disposed above the heat exchanger of purified water (55) so that the evaporator (52) is separated from the purified water heat exchanger (55), and the purified water from the purified water heat exchanger (55) is cooled when the frozen water lodged in the inte The top of the ice storage tank (50) is contacted with the purified water heat exchanger (55).Un purificador de agua que comprende: un conducto de flujo de agua (15) que permite que el agua purificada se mueva a través del mismo； una unidad de almacenamiento de gas (20, 21, 22a, 22b) que permite que el gas se almacene； un conducto de flujo de gas (25) que permite que el gas fluya desde la unidad de almacenamiento de gas； un tanque de almacenamiento de hielo (50) que intercambia el calor del agua purificada proporcionada a través del conducto de flujo de agua (15) con agua helada para permitir la descarga de agua fría； y un tanque de mezcla (40) que permite que el agua fría que se ha enfriado en el tanque de almacenamiento de hielo (50) se mezcle con el gas re
