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What Does a Gas Heating Engineer Do? A gas engineer is a specialist who works on systems and appliances that use natural gas. They install, repair and maintain these systems and are able to handle any issues that may arise. To work legally to be legally employed, they must be registered on the Gas Safe Register and must notify local authorities of any work they have completed. This is to avoid gas leaks as well as explosions, fires and carbon monoxide poisoning. Qualifications A gas heating engineer is an expert who works with systems and appli