What are the specs for this Heat Exchanger?

The correct replacement for Lennox model OEM Lennox Heat Exchanger — 74W08 (R48077-010) is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Lennox equipment which lists the model number OEM Lennox Heat Exchanger — 74W08 (R48077-010).

What symptoms indicate I need a new heat exchanger?

Common symptoms that indicate you need a new heat exchanger include unusual noises, intermittent operation, complete failure to operate, or visible damage. For specific diagnostic guidance, visit nationalhvacparts.com/pages/hvac-diagnostic.

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Lennox

OEM Lennox Heat Exchanger — 74W08 (R48077-010)

Name: OEM Lennox Heat Exchanger — 74W08 (R48077-010)
Brand: Lennox
SKU: LNX-74W08
Price: 399.95 USD
Availability: InStock

SKU: LNX-74W08 Brand: Lennox

$399.95 $549.95

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The genuine OEM Lennox 74W08 heat exchanger (interchange R48077-010) is the core combustion component of your Lennox gas furnace. It transfers heat from the burning fuel to the circulating air stream while keeping combustion byproducts safely separated from the air your family breathes. This factory assembly is engineered to the exact tolerances of your Lennox unit for proper airflow, rated efficiency, and long service life.

Common failure symptoms: A failing heat exchanger often shows visible cracks or rust, a flickering or shifting burner flame, unusual odors, soot buildup, or a furnace that repeatedly trips the flame sensor or limit switch on high heat. Because cracks can leak carbon monoxide, a compromised heat exchanger should never be ignored.

Why OEM matters: Lennox furnaces are built around precise heat-exchanger geometry and metallurgy. Installing the OEM 74W08 ensures correct fit, safe combustion clearances, and preserves your equipment warranty — something aftermarket substitutes rarely guarantee. Restore safe, efficient heating with the exact part your Lennox system was designed for.

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

OEM Lennox Heat Exchanger — 74W0...

$399.95

Frequently Asked Questions

Does this Heat Exchanger fit my Lennox OEM Lennox Heat Exchanger — 74W08 (R48077-010)?

Yes. This is the factory-specified OEM heat exchanger for the Lennox OEM Lennox Heat Exchanger — 74W08 (R48077-010). 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 — 74W08 (R48077-010)?

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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OEM Lennox Heat Exchanger — 74W08 (R48077-010)

Shipping Information

Return Policy

Frequently Asked Questions