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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.
A good place to start is to compare your oil or natural gas furnace age to the national average. The average life expectancy of furnaces in homes today is between 16 and 20 years.