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What Does a Boiler Gas Engineer Do? A boiler gas engineer ensures heating systems, water heaters and other appliances work properly. They also ensure the security of homes by identifying any potential leaks and fixing them. Carbon monoxide can be a deadly gas which prevents oxygen from being carried by blood around the body. A defective boiler can release this poisonous gas into your home. Qualifications A boiler gas engineer is a specialist who maintains, fixes and installs gas-powered equipment in