Good workmanship. The positives I can save myself. Not scolded praise is enough. Only one negative point: After a short time indefinable, pinhead-sized black dots have been formed on the boiler base (indoor). At first, I did away with steel wool. That was quite a chore because the boiler base through the small opening is just not easily accessible. I was on the point of the company WMF to write, when I got the following tip.: Vinegar with water in the boiler (approximately 3/4 liter of water) Bring to a boil, let stand until cooled is Knock-out, flush finish. What can I say: The boiler base was then spotless. This has reconciled me with the product. With this procedure every 6 months, I can live with, because limescale thereby also disappear.
The error with the steel wool and the tip with the vinegar water I had noticed from the beginning, if I had only read the operating instructions.
The deduction of points in the rating is due to the black, not mentioned in the operating instructions indicated formation. Otherwise makes the boiler exactly what I bought it.