The maintenance heater, which is installed directly on the tank and connected to the dish system, heats the water as support to ensure a sufficiently high dish temperature and thus a prerequisite for good milk quality. The heater, which is switched on during the main wash, phase 4, can raise the temperature by 5-10 degrees Celsius, depending on the size of the tank. Incoming hot water from the water heater should have a temperature between 60-80 degrees Celsius.