The reason for buying was the very dry air in the apartment during the winter heating season. I was looking for a robust, low-maintenance device. That can be used during operation without nachzukaufenden parts. After extensive comparisons with other air washers I decided for this not so favorable model. With use, I am more than impressed! It is in normal operation quietly in night mode, however, hardly perceptible. Operation is simple, easy to clean. Just take a shower and wash basin, possibly. Still a cleaning cloth for cleaning. This unit has supplied very well with the desired humidity even large rooms. I would highly recommend it.