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What Does a Boiler Gas Engineer Do? A boiler gas engineer ensures that heating systems, water heaters, and other appliances work correctly. They also ensure the security of homes by identifying leaks that could be present and fixing them. Carbon monoxide is an extremely dangerous gas that blocks the blood from carrying oxygen throughout the body. A defective boiler can leak this poisonous gas into your home. Qualifications A boiler gas engineer is an expert who maintains, fixes, and installs gas powered eq