The present invention, at least one hot water generator (10, 20), the brewing device 50 that can be supplied with hot water from the hot water generator (10, 20), drinking water from the drinking water supply line 30 to the hot water generator ( A fully automatic beverage machine for producing freshly brewed hot beverages, comprising a drinking water pump 11, 21 for delivery to 10, 20. The hot water generators 10, 20 are continuous flow heaters and have perfusion meters 12, 22 for measuring the volume of drinking water delivered by the drinking water pumps 11, 21. The fully automatic beverage machine also has a demineralization system 40 for automatically demineralizing the continuous flow heaters 10, 20. The demineralization system 40 includes a mixing vessel 41 for mixing the demineralizing agent solution, a receiving chamber for the storage vessel 42 for the demineralization concentrate, and the demineralization concentrate from the storage vessel 42. A dosing pump 43 for dosing delivery to the mixing vessel 41, wherein the decalcification concentrate and the demineralizing agent solution from the drinking water are mixed in the mixing vessel. On the suction side, the drinking water pumps 11, 21, via the first directional valve 44, are provided with a hot water generator 10, from the mixing vessel 41 at the switched valve position of the first directional valve 44. 20, may be connected to the extraction line 49 of the mixing vessel 41 in a switchable manner to deliver the demineralizing agent solution, on the pressure side, the drinking water pump 11 is provided with a second directional valve. Through 45, the mixing vessel (in a switchable manner) to deliver the drinking water to the mixing vessel 41 for mixing the demineralizer solution at the switched valve position of the second directional valve 45. 41 may be connected to the drinking water supply line 47.
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