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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 may also install or maintain ductwork. Some make use of their technical knowledge to improve efficiency in energy use and comply with the regulations. Some take on managerial positions or even create their own company. This is a mobile role that often involves working from different locations, so excellent communication and travel skills are vital. Installation If you're thinking about making a career change the possi