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What Does a Gas Heating Engineer Do? A gas engineer is a specialist who works with systems and appliances that run on natural gas. They install repairs, maintain and repair these systems and are able deal with any problems that might arise. To work legally to be legally employed, they must be registered on the Gas Safe Register and must notify local authorities of the work they have done. This is to avoid gas leaks or explosions, fires, and carbon monoxide poisoning. Qualifications A gas heating engineer is a professional who specialises in th