What are the specs for this Heat Exchanger?

The correct replacement for Lennox model OEM Lennox Heat Exchanger Assembly — 19A61 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 Assembly — 19A61.

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 Assembly — 19A61

Name: OEM Lennox Heat Exchanger Assembly — 19A61
Brand: Lennox
SKU: LNX-19A61
Price: 399.95 USD
Availability: InStock

SKU: LNX-19A61 Brand: Lennox

$399.95 $549.95

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The genuine OEM Lennox 19A61 heat exchanger assembly is the core combustion component of your Lennox gas furnace. It transfers heat from the burning fuel to the circulating air stream while keeping toxic combustion byproducts safely separated from the air your family breathes. Built to exact Lennox specifications, this assembly restores rated heating output and efficiency to your system.

Common failure symptoms: A failing heat exchanger often shows visible cracks or rust, produces a flickering or roll-out burner flame, triggers repeated flame-sensor or limit-switch shutdowns, and can allow carbon monoxide to enter the home. You may also notice a strong odor near the furnace, soot buildup, or unexplained CO detector alarms — all reasons to replace the assembly immediately.

Why OEM matters: The heat exchanger is a safety-critical part. Aftermarket or misfit units can warp, leak flue gas, or void your Lennox warranty. This factory-original 19A61 guarantees correct metallurgy, weld integrity, and dimensional fit for a lasting, safe repair. In stock and ready to ship same day before 3PM CST.

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 Assemb...

$399.95

Frequently Asked Questions

Does this Heat Exchanger fit my Lennox OEM Lennox Heat Exchanger Assembly — 19A61?

Yes. This is the factory-specified OEM heat exchanger for the Lennox OEM Lennox Heat Exchanger Assembly — 19A61. 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 — 19A61?

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 Assembly — 19A61

Shipping Information

Return Policy

Frequently Asked Questions