OEM Lennox Heat Exchanger Assembly — 83K09

Genuine OEM Lennox 83K09 heat exchanger assembly. This component captures heat from your furnace's burners and transfers it into the circulating air stream, all while forming a sealed barrier that keeps combustion byproducts out of the air you breathe. Built to Lennox factory specifications, the 83K09 is a direct replacement that restores your furnace to its original heating capacity and safety performance.

Common failure symptoms: Watch for cracks, hairline splits, or rust-through in the exchanger walls, a yellow or dancing burner flame, soot or scorch marks, strange odors during operation, or nuisance shutdowns caused by the flame rollout or high-limit safety switches. Any of these can indicate a breach that allows carbon monoxide into the home, making prompt replacement essential.

Why OEM matters: Lennox heat exchangers are matched to the exact burner pattern, airflow, and thermal expansion profile of your furnace. Installing a genuine 83K09 guarantees correct fit, proper gas-to-air separation, and the efficiency and safety ratings your system was certified to meet. Choosing OEM protects your equipment warranty and delivers the long service life you expect from Lennox.