External steam generation 

The benefits of external steam 
Innovative steam system: unlike other systems, the steam is generated outside the oven compartment in our appliances. During the cooking process, the incoming steam completely fills the oven compartment and displaces the oxygen. This results in fast heating and optimum temperature measurement, preserving the natural colour of the food. And because limescale cannot build up in the oven compartment, cleaning is particularly easy. 
Images serve as examples to illustrate the product benefit. Actual feature may vary per model.