An industrial microwave rated for hundreds of cycles a day rather than a few. On a line what matters is the programmable pad and the digital timer, so nobody has to think in seconds, and an output you dial between 1 and 8 kW depending on the model.
Commercial units take constant cycling and higher output that domestic models aren't built for.
By wattage and duty class — higher wattage and heavy-duty builds suit busier kitchens. We'll match to your use.
Many have preset pads for repeatable reheating across staff. We'll note features per model.
Because the door goes first. A heavy duty commercial microwave is rated for the number of openings a service actually makes, and an industrial microwave oven at 1800–2100 W reheats in a third of the time, which is the difference between a plate leaving the pass hot and leaving it late.