Steam ovens are similar to microwave ovens in their function to heat and defrost food. The two differ in their heating principles and effectiveness. Steam ovens are heated by steam, which allows the food to retain more moisture during the heating process, thus maintaining its freshness and tenderness.

Microwave ovens, on the other hand, heat food through microwave radiation, which may cause the surface of the food to dry out and lose some of its moisture. In terms of heating speed, microwave ovens are usually faster. In terms of price, the Micro Steamer is the most expensive, followed by the Steam Oven, then the Micro Grill, and finally the Microwave.