Abstract: The invention relates to a wort boiler apparatus comprising a wort boiler vessel and at least one separate heating circuit external of the boiler vessel and including a heat exchanger for heating or boiling the wort, the heat exchanger comprising an arrangement of heat exchanger pipes for passing the wort through the heat exchanger. The object of the invention is to provide a heat exchanger adapted to be adjusted to different evaporation values as required for making different types of beer. To attain this object, the invention provides that the arrangement of heat exchanger pipes includes pipe connections and valves in an arrangement permitting the wort to be passed through the heat exchanger along flowpaths of different lengths.