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The Average Boiler Life Expectancy. Boiler life expectancy depends very much upon the type of boiler that you purchased. The average expectancy of a traditional gas boiler would be between 10 and 15 years, if you keep it well maintained and have it serviced annually. Other boilers, such as electrical devices, will last between 8 and 10 years.
gas furnaces typically last 20 to 25 years. Furnaces are usually replaced when the heat exchanger fails. Other minor components are typically replaced when they fail. Some furnaces are known by reputation to fail early on a regular basis.henever you see one, it is probably safe to say it is close to the end of its life. Combination systems are relatively new, and since the furnace side is relatively simple, there is no reason to expect a short life expectancy.