The invention relates to an interface element to be fixed on andor in an interface element holder of an electrical appliance, which element includes a hard component portion. In one embodiment, the program is written in the Java language and runs in the Java Runtime Environment that includes a Java Virtual Machine having a configuration. The bioavailability agent comprises an ionic detergent comprising a chain of at least 10 carbon atoms or a non-ionic detergent comprising a chain of at least 15 repeating ethylene oxide units or propylene oxide units or a combination of ethylene oxide units and propylene oxide units. These tubular parts are located in the corner inside the reservoir, and the coolant supply tube extending to the lever below the lower allowable level of the coolant in the reservoir but above the bottom portion of the reservoir.