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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.
Just because you called an HVAC company and it performed an estimate doesn't mean you are obligated to purchase from it. Natural gas furnaces generally last 10 to 15 years, so don't budge on getting the best furnace your budget allows. When you call for a quote, ask the HVAC company about its licensing. A suitable contractor needs to be licensed and certified to install your new system.