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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.
Older furnaces that were made with heavy metal heat exchangers, like cast iron, have been known to last 30 to 40 years, but they're also known for being energy drainers. Forced air furnace heat exchangers have an average life expectancy of 15 years, with a range typically between 13 and 20 years.