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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 operating correctly. They also ensure the safety of homes by identifying any leaks that could be present and fixing them. Carbon monoxide can be a deadly gas that stops the blood from carrying oxygen throughout the body. A defective boiler could leak the poison into your home. Qualifications A boiler gas engineer is an expert who maintains, fixes and inst