Unfortunately, I trusted only the test of Stiftung Warentest and bought this Siemens washing machine WM14S443. Delivery went like always excellent on Amazon. Unfortunately, this machine is an absolute bad buy! Why? Woolies, which could be easily washed with a washing machine "ancient" source, was in a desolate condition of the machine - or matted clump strong !!! This in spite of a special detergent for wool / silk and of course the appropriate wash program. The rest of laundry (wash 60 degrees) seems to be under attack! From a purchasing this machine can only be recommended. The fermentation is very likely in a bad design of the washing drum. We will insist the seller (Amazon EU Sarl) on conversion.