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What Does a Boiler Gas Engineer Do? A boiler gas engineer ensures that heating systems, water heaters and other appliances are operating properly. They also ensure that homes are safe by identifying and fixing possible leaks. Carbon monoxide is a deadly gas that prevents oxygen from being carried by the blood throughout the body. A malfunctioning boiler could leak this poisonous gas into your home. Qualifications A boiler gas engineer is an expert who repairs, maint