Abstract: Described is a coffee percolator the brewing cycle of which is controlled by control means. This coffee percolator is provided with further control means effective to initiate and to control a hot flushing operation for preheating those parts of the coffee percolator which come into contact with the coffee separately from the brewing cycle proper.

Abstract: In a coffee percolator having a brewing section, different operating positions are controlled by a control piston driven by a motor by the action of suitable control means. The control piston moves through a coffee meal supply opening and a coffee-grounds flushing opening, both of which are provided in said brewing section, for selectively or contemporaneously opening and closing these openings in the different operating positions. In a brewing position the control piston closes both openings, so that an overpressure is generated within the brewing section. Subsequent to the brewing operation this overpressure is relieved in a relief position by opening the flushing opening while said supply opening remains closed. The relief position is succeeded by a flushing position, in which the supply opening is likewise opened, so that the exhausted coffee-grounds can be flushed out.