OEM Lennox Heat Exchanger Assembly — 58W73

The genuine OEM Lennox 58W73 heat exchanger assembly is the core combustion component of your Lennox gas furnace. It transfers heat from the burner flame to the circulating air stream while keeping combustion byproducts safely separated from the air you breathe. This assembly is engineered to the exact dimensions, alloy, and tube geometry specified for compatible Lennox furnace platforms, ensuring proper airflow, rated efficiency, and a safe seal against the burner box.

Heat exchangers degrade over years of thermal cycling. Common symptoms of a failing 58W73 include visible cracks or corrosion, a flickering or rolling burner flame, soot buildup, unusual odors, a furnace that short-cycles on the limit switch, or a carbon monoxide detector that trips during operation. Because a compromised heat exchanger is a safety hazard, prompt OEM replacement is essential.

Choosing the OEM Lennox 58W73 matters because aftermarket exchangers rarely match the original metal gauge and stamping tolerances, which can cause premature cracking, poor heat transfer, and airflow restrictions. This factory part restores your furnace to its designed performance and preserves your Lennox warranty coverage.