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What Does a Boiler Gas Engineer Do? A boiler gas engineer makes sure that heating systems, water heaters and other appliances are working correctly. They also ensure that homes are safe by identifying and fixing any potential leaks. Carbon monoxide can be a deadly gas that prevents oxygen from being carried by the blood around the body. A malfunctioning boiler can release the poison into your home. Qualifications A boiler gas engineer is an expert who repairs, maintains, and installs gas powered equipment in both residential and commercial sett