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What Does a Gas Heating Engineer Do? A gas engineer is an expert in appliances and systems that run on natural gas. They are able to install maintenance, repair and maintain these systems and can deal with any issues that may arise. They must be registered on the Gas Safe Register to work legally and must inform the local authority of any work they complete. This is to avoid gas leaks, fires and explosions, as well as carbon monoxide poisoning. Qualifications A gas heating engineer is a professional who specialises in the operation of appliance