Commercial microwave ovens are a different machine to the ones commonly found in the home. The main difference is the power output of the commercial microwave oven is often a lot more than a domestic microwave oven, often double. Commercial microwave ovens have two magnetrons and provide a streams of microwaves which are fairly evenly distributed around the cabinet. For this reason, the commercial microwave ovens do not require a rotating turntable like the domestic variety.
Commercial microwaves are generally more heavy duty than domestic ones and are fully programmable and stackable. Many come with a manufacturer 3 years warranty. Commercial microwaves are not only used for the heating of food, but also defrosting and cooking of certain food products.