Abstract: Apparatus for the continuous boiling of wort serving for beer production in a reactor at a temperature increased and a pressure increased during the time of stay in the reactor, which reactor is preceded by a wort preheater heated by wort vapor, and by an outside boiler heated by outside steam, and is followed by at least one expansion stage. The reactor and the at least single expansion stage are followed by at least two evaporation stages, to which wort vapor condensers are connected, to which the wort vapors from their associated evaporation stages are fed, and in which water is heated by the use of the condensate heat, while a wort cooler is connected to the output of the vacuum evaporator.