this cooktop is a piece of junk.  the "controls" can hardly be controlled.  i'm not even trying to use that unbelievably inferior working turn knob anymore.  it is not a refrigerator magnet, which is the only thing it's good for. shortly after i purchased this cooktop, i had some samsung "experts" look at it and they replaced a part that did not improve it at all.  i also have reason to believ that the outer ring of the large burner is not working at all.  putting a large enough pan on it, it only heats up the middle part. the wifi part of it has never even worked at all!
it is certainly not worth the money!