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Lennox

OEM Lennox Stainless Steel Heat Exchanger — 78W83

SKU: LNX-78W83 Brand: Lennox
$399.95 $549.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The genuine OEM Lennox 78W83 stainless steel heat exchanger (factory part number 607167-03) is built for the demanding, corrosive environment of high-efficiency condensing furnaces. Stainless steel construction stands up to the acidic condensate produced when flue gases cool below their dew point, extending service life while maintaining the efficient, safe heat transfer that separates combustion byproducts from your home's supply air. This is the exact exchanger specified for your Lennox equipment.

Common failure symptoms: Look for cracks, pinholes, or split seams in the exchanger, flame rollout or a fluttering flame when the blower starts, water pooling or leaking inside the cabinet, corrosion and pitting, soot, or carbon monoxide detector activation. Because condensing exchangers operate under constant moisture exposure, any breach demands immediate replacement.

Why OEM matters: The 78W83 matches Lennox's precise flue-path routing, condensate drainage angles, and stainless alloy specification. Non-OEM substitutes can compromise drainage, corrode prematurely, and void your furnace warranty. Installing the genuine assembly guarantees a correct fit, proper condensate handling, and the rated efficiency and safety of your Lennox condensing furnace. Installation should be performed by a licensed HVAC professional.

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 — 78W83?
Yes. This is the factory-specified OEM heat exchanger for the Lennox OEM Lennox Stainless Steel Heat Exchanger — 78W83. 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 — 78W83?
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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