A device for preparing a heated liquid for use with a beverage-making appliance includes a liquid transport channel in communication with a liquid reservoir which discharges into a first chamber. The first chamber includes a steam inlet which is connectable to a steam generator. A second chamber of the device is connected to the first chamber via a restriction and has a liquid outlet. The device is in the form of a cartridge n which the liquid reservoir, the liquid transport channel, the first chamber, the steam inlet, the restriction, the second chamber, and the liquid outlet are provided. All components of the device are integrated into one cartridge, so the cartridge can be discarded after use.