Abstract: Disclosed is a method described for heating brewing mash, and a heat source and a heat exchanger that transfers heat with it and that has mash flowing through it are provided. The heat exchanger exhibits at least one evenly coiled tube that has a smooth surface on the inner side. The spelts contained in the brewing mash continuously repolish the inner surface of the tube so that the danger of deposits and overheating of brewing mash components is reduced.