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What Does a Gas Heating Engineer Do? A gas engineer is an expert who works on appliances and systems that run on natural gas. They are able to install maintenance, repair and maintain the systems and are able to handle any issues that may arise. They must be on the Gas Safe Register to work legally and they must inform the local authority of any projects they have completed. This is to stop gas leaks, fires, explosions and carbon monoxide poisoning. Qualifications A gas heating engineer is a pro