The answer to 'when to service heat exchanger' is that you should have your heat exchanger serviced by a professional HVAC technician at least once per year, or whenever you notice any issues with your heating system. The heat exchanger is a critical component that plays a vital role in safely and efficiently generating heat for your home.
Regular maintenance of the heat exchanger helps ensure it is operating properly and safely. This includes inspecting for cracks or damage, cleaning, and testing for proper airflow and combustion. Neglecting to service the heat exchanger can lead to dangerous situations, such as carbon monoxide leaks, reduced efficiency, and even complete system failure.