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What Does a Gas Heating Engineer Do? A gas engineer is an expert who works with systems and appliances that use natural gas. They are able to install, maintain and repair the systems and are able to handle any issues that might arise. They must be on the Gas Safe Register to work legally and must inform the local authority of any installations they complete. This is to stop gas leaks or explosions, fires, and carbon monoxide poisoning. Qualifications A gas heating engineer is a professional who is involved in the operation of appliances and systems