How long do heat exchangers last?

In the past, heat exchangers were often built with heavy metals, such as cast iron. These exchangers can last as long as 30 or 40 years, much longer than the steel exchangers most manufacturers build today. Modern stainless or aluminized steel heat exchangers typically have a life span of 15 to 25 years.Click to see full answer. Furthermore, how do I know if my heat exchanger is bad? Signs Your Furnace Heat Exchanger May be Cracked Strange smells. A malfunctioning heat exchanger will often create an unpleasant and strong odor that smells similar to formaldehyde. Soot. Corrosion & Cracks in other furnace components. Change in appearance of flame. Other physical signs. Furthermore, how much does it cost to replace a heat exchanger? Replacing a furnace heat exchanger costs $1,500 on average with a typical range between $1,000 and $2,000. Most have a warranty of 10 to 20 years, which usually only covers the price of the exchanger, which typically ranges from $500 to $2,000. Labor alone runs an average of $500. Subsequently, one may also ask, how long does it take to replace a heat exchanger? 8 hours What is the average life expectancy of a gas furnace? 20 years