stood in the manual, you should boil water for cleaning twice before the actual commissioning. Naturally, we have done. But even after more than two weeks in daily use stinks the device after cooking such penetrant after plastic that I do not even want to know how much is released into the water of the stuff. I have returned the device today and am going now a stove made of pure stainless steel with as little plastic as possible buy (unfortunately not so easy, as my long search in Amazon has shown ...).