A stationary engineer is a license operator of boilers, steam turbines, auxiliary equipment (ie. air compressors/pumps) or refrigeration machinery. He or she works in factories, offices, hospitals, warehouses, ships or any other locations requiring the use that equipment. A stationary engineer has various titles. For example, boiler operator, power plant operator and/or watch engineer. In addition, they have various designations (first class, second class and third class).