Abstract: A geothermal heat- and water supply plant comprises a geothermal well to remove brine which communicates with a separator which, in turn, communicates in the steam phase with a jet pump and a high pressure stage of an injector, and in the fluid phase--with the cooled side of a heat exchanger which communicates with the jet pump. Water is drawn from the injector outlet to water and heat supply systems, and once used therein, the water is fed to one inlet of the heat pump whose one outlet communicates with the injector high pressure stage. The other outlet of the heat pump communicates with the jet pump outlet, and the other outlet--with the well for pumping the brine.