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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.
Typically, though, furnaces will last 15 to 20 years, while boilers can last up to 30 years, depending on the quality of the water supplied to the system. Proper maintenance of your central heating system includes regular inspections and cleaning by a licensed technician.