An apparatus for preparing a beverage from water and an instant product includes a water supply system for supplying water, a heating device for sterilizing water by heating it; and a cooling device for cooling water heated in the heating device. The cooling device uses water from the water supply system as cooling-water. The water that is sterilized in the heating device has preferably previously been used in the cooling device as cooling-water. The cooling device includes a counter flow heat exchanger.
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