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What Does a Boiler Gas Engineer Do? A boiler gas engineer ensures heating systems, water heaters and other appliances function properly. They also ensure the security of homes by identifying any potential leaks and repairing them. Carbon monoxide is a deadly gas that stops the blood from carrying oxygen throughout the body. A malfunctioning boiler could let this gas enter your home. Qualifications A boiler gas engineer is an expert who maintains, repairs and installs gas-powered equipment in both domestic and commercial