OEM Lennox Heat Exchanger — 15W85
OEM Guaranteed
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30-Day Returns
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The genuine OEM Lennox 15W85 heat exchanger is the core component that transfers combustion heat to the air moving through your furnace while keeping flue gases safely separated from your home's airflow. Engineered to exact Lennox specifications, it restores rated heating capacity and preserves the safety barrier your furnace depends on.
Common failure symptoms: A failing heat exchanger often shows up as visible cracks or rust, soot buildup, a flickering or off-color burner flame, unusual odors, or a carbon monoxide detector alarm. Reduced heat output and short-cycling can also signal that the exchanger has degraded and needs replacement.
Why OEM matters: The heat exchanger is a safety-critical part. A genuine Lennox 15W85 is manufactured from the correct alloy and to the precise dimensions of your unit, ensuring a proper seal, correct thermal expansion behavior, and full compatibility with your furnace's burner and blower system. Aftermarket substitutes risk improper fit and compromised combustion containment — never worth the gamble on a component tied to combustion safety.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days