heat-exchanger-diagram

heat exchanger

It might be hard to believe but when heat exchangers crack it is actually part of a natural process that happens to every furnace over time.  Cracks in the metal surfaces can be caused by stress and flexing of the metal.  When your furnace heats up and cools down, it will cause the metal surfaces to apply stress to the metal when it contracts and expands.  How fast this occurs is up to the specific model, how well the furnace is maintained and the quality of the installation.  Although the cracks usually are noticeable over time, premature cracks can occur early in the life of your furnace if it is not properly installed or maintained.  Dirty filters, closed off vents and even furniture blocking the vents can contribute to premature heat exchanger cracks.  The improper air flow can cause the system to work a lot harder than it should!

If your furnace has not been run in a long time it can be rusted out because of the condensation that can accumulate in the heat exchanger! Another cause to look at is improper combustion of gases.  When the burners are not firing properly, they can run at a lower efficiency or even hotter than the unit is designed to run.

Your heat exchanger should last about 20 years with regular maintenance.  The heat exchanger performs a very important function and if it is cracked, it can’t work properly and should be repaired as soon as possible.  It’s a good idea to gear up for winter by turning on your furnace in early to mid-fall for testing purposes.  We offer a furnace check-up to address any issues that your furnace may have and to ensure its safe and proper operation. Gillece HVAC Heating Technicians are more than qualified to assist you with your heating problems.