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Lennox

OEM Lennox Heat Exchanger Assembly — 53L57

SKU: LNX-53L57 Brand: Lennox
$399.95 $549.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

Genuine OEM Lennox 53L57 heat exchanger assembly. The heat exchanger is the heart of your Lennox gas furnace — it transfers heat from the combustion process to the air moving through your ductwork while keeping combustion gases safely separated from your home's air supply. This factory component is engineered to the exact tolerances and metallurgy of your original Lennox unit for proper fit and rated performance.

Common failure symptoms: A failing heat exchanger often shows up as visible cracks or corrosion, rust flakes near the burner area, a flickering or lifting burner flame, soot buildup, unusual odors, or a furnace that repeatedly trips on the flame rollout or limit switch. Because a compromised heat exchanger can allow carbon monoxide to reach the airstream, replacement should never be delayed.

Why OEM matters: Lennox furnaces are designed around the precise dimensions, alloy, and airflow characteristics of their factory heat exchangers. A genuine 53L57 assembly ensures correct sealing, proper heat transfer, and continued compliance with the safety and efficiency ratings of your system — protecting both your equipment warranty and your family. Aftermarket substitutes can shift airflow and combustion balance, risking premature failure.

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

Frequently Asked Questions

Does this Heat Exchanger fit my Lennox OEM Lennox Heat Exchanger Assembly — 53L57?
Yes. This is the factory-specified OEM heat exchanger for the Lennox OEM Lennox Heat Exchanger Assembly — 53L57. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.
How do I replace the heat exchanger on my Lennox OEM Lennox Heat Exchanger Assembly — 53L57?
Refer to your equipment service manual for model-specific steps. General approach: turn off power, photograph connections, remove old part, install new part, restore power and test. For gas components, hire a licensed technician. Email info@nationalhvacparts.com for guidance.
What symptoms mean I need a new heat exchanger?
Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.
Is this heat exchanger compatible with Bryant or Payne too?
Many Lennox parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.
Should I use OEM or aftermarket for my Lennox heat exchanger?
OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.
How fast does National HVAC Parts ship?
Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.
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Mike Rivera
HVAC Parts Specialist — Online