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What Does a Boiler Gas Engineer Do? A boiler gas engineer is responsible for ensuring that water heaters, heating systems and other appliances work properly. They also ensure the security of homes by identifying any leaks that could be present and fixing them. Carbon monoxide can be a deadly gas that prevents oxygen from being carried by blood throughout the body. A faulty boiler may let this gas enter your home. Qualifications A boiler gas engineer is a specialis