Microwave ovens of a type designed to be used in restaurants, canteens, etc., differ from domestic appliances of heading 8516 in their power output and oven capacity. Such ovens having a power output of more than 1 000 W or an oven capacity of more than 34 litres are considered to be for industrial use. For microwave ovens combined in a single housing with a grill or another type of oven, the aforementioned power output applies only to the microwave. The classification of such a combination is not influenced by the oven capacity criterion. Microwave ovens having a power output of not more than 1 000 W and an oven capacity of not more than 34 litres are considered to be for domestic use (heading 8516).