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Lennox

OEM Lennox Stainless Steel Heat Exchanger Assembly — 53K71

SKU: LNX-53K71 Brand: Lennox
$399.95 $549.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The Lennox 53K71 is a genuine OEM stainless steel heat exchanger assembly that transfers combustion heat to the air moving through your furnace while keeping flue gases safely separated from the airstream. Built from corrosion-resistant stainless steel, it is engineered to the exact tolerances of your Lennox furnace for proper airflow, burner alignment, and rated efficiency.

Common failure symptoms: A failing heat exchanger often shows up as visible cracks or rust, a flickering or shifting burner flame, soot buildup, unusual odors, or a furnace that repeatedly trips on the limit switch and short-cycles. Because cracks can allow carbon monoxide to leak into the home's air, a compromised heat exchanger is a safety issue that should be replaced without delay.

Why OEM matters: The 53K71 is manufactured to Lennox's original specifications, so it fits the burner box, gaskets, and mounting points precisely and preserves the combustion characteristics your furnace was certified for. Aftermarket substitutes can distort airflow, cause premature failure, and void warranty coverage. Choose the genuine OEM part for a safe, reliable, factory-correct repair.

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 Stainless Steel Heat Exchanger Assembly — 53K71?
Yes. This is the factory-specified OEM heat exchanger for the Lennox OEM Lennox Stainless Steel Heat Exchanger Assembly — 53K71. 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 Stainless Steel Heat Exchanger Assembly — 53K71?
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