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What Does a Gas Engineer Boiler Do? Gas engineers have a dangerous job. Whenever they are working in people's homes, they may encounter asbestos or other hazardous substances that could trigger explosions and fires. They must be prepared to face such dangers, and know how to minimize the risk. While it's true that gas boilers are slowly being replaced by greener heating options, that does not mean that being an engineer in gas is no longer a viable career choice. There are many reasons for this. Q