... RUST !!! My initial enthusiasm over the kettle has settled after 10 months. Unfortunately, more and more small rust spots showing on the floor inside which are gradually larger, get away from time to time and in the water with vinegar cleaner schwimmen.Lediglich the kettle was decalcified nothing to damage the inside. Disappointed by the poor quality, I have garment's manufacturer Riess, asking for conversion. The answer was succinct: Please contact the seller. Bought here in the marketplace, the seller has become insolvent and I am pretty stupid because the grate boiler. Apparently steel is then but in the long term the better choice. For quality and service of the boiler manufacturer from me a star.