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Lennox

OEM Lennox Heat Exchanger Assembly 612983-05 — 14K73

SKU: LNX-14K73 Brand: Lennox
$399.95 $549.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The genuine OEM Lennox 14K73 heat exchanger assembly (factory reference 612983-05) is the heart of your Lennox gas furnace's heating cycle. It captures heat produced by the burners and transfers it into the blower airflow, all while containing and venting combustion byproducts safely away from your home. Precision-formed sections maximize heat transfer surface area for efficient, even heating.

Common failure symptoms include cracked or corroded metal, a burner flame that flutters when the blower engages, rust or soot buildup, strange smells during operation, condensation around the furnace, or a triggered carbon monoxide alarm. Because a compromised heat exchanger can leak flue gases into conditioned air, replacement is a safety priority.

Why OEM matters: The 14K73 is built to Lennox's exact metallurgical and dimensional specifications, ensuring an airtight seal, proper gas containment, and full rated efficiency. Generic replacements can warp, seal poorly, or fail early. Installing the authentic OEM assembly restores your furnace to factory performance and preserves its safety certification. Professional installation by a licensed HVAC technician is strongly recommended.

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 612983-05 — 14K73?
Yes. This is the factory-specified OEM heat exchanger for the Lennox OEM Lennox Heat Exchanger Assembly 612983-05 — 14K73. 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 612983-05 — 14K73?
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
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