Yes, several levels can be used at the same time. However, it is important to note the following points:
a) The appliance must be well preheated before the food is inserted.
b) The oven must be operated with one of the ‘convection’ programmes. This ensures that the heat is evenly distributed in the baking chamber by a fan and reaches everywhere.
c) The cookware used must be adapted to the size of the baking chamber. No cookware or food should touch the heating elements. The baking chamber should also not be overfilled so that the hot air can be distributed evenly.
d) Cooking times may be longer if there is a large amount of food in the oven.