Had issues at the start with the main burner sooting up all the pans. Parmco were extremely reluctant to help and after sending me some kind of plate that I had to fit myself the rang and ignored my response that it still wasn't right. It now is sooting up pans again but I am over this unit. This is the first hob I have installed in a few builds, that has had problems. Checking other reviews confirms my opinion that these are junk.