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What Does a Commercial Gas Engineer Do? Commercial gas engineers work on a range of appliances, including boilers and heating systems. They can also install and maintain ductwork. Some make use of their technical knowledge to increase energy efficiency and comply with the regulations. Some are promoted to managerial positions or even begin their own business. This is a mobile job that requires working in a variety of locations. Communication and travel skills are essential. Installation If you're thinking about changing careers, becoming a comme