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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.
Considerations. According to a study by Consumer Reports, home furnaces usually last between 13 and 20 years, with the majority of them having about a 15-year lifespan. If you have a furnace with a cast iron exchanger, it could last longer, although they are typically less efficient.onsiderations. According to a study by Consumer Reports, home furnaces usually last between 13 and 20 years, with the majority of them having about a 15-year lifespan. If you have a furnace with a cast iron exchanger, it could last longer, although they are typically less efficient.