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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.
Gas furnace costs range from $1,700 to $5,000, including installation, for low-to-moderate efficiency systems, depending on the size of the furnace required by your home.The lowest annual fuel utilization efficiency (AFUE) rating allowed by the U.S. Department of Energy for a gas furnace is 80 percent.as furnace costs range from $1,700 to $5,000, including installation, for low-to-moderate efficiency systems, depending on the size of the furnace required by your home.