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What Does a Boiler Gas Engineer Do? A boiler gas engineer ensures water heaters, heating systems and other appliances are operating correctly. They also ensure the safety of homes by identifying potential leaks and fixing them. Carbon monoxide is a deadly gas that blocks oxygen from being carried by the blood throughout the body. A defective boiler can leak this poisonous gas into your home. Qualifications A boiler gas engineer is an expert who repairs, maintains and installs gas powered equipment in both residential and commercial settings. They co