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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.
The answer to this question depends on a variety of factors and you will need to examine them carefully. Typically, a forced-air gas furnace can be expected to last from 15 to 20 years.Some experts give a range of 13 to 25 years, because there are many variables. For example, some home builders use lower quality units made by well-known manufacturers.ypically a forced-air heat exchanger can be expected to last between 15 and 20 years. Ultimately, heat exchangers fail because of the constant heating and cooling.