What are the specs for this Heat Exchanger?

The correct replacement for Lennox model OEM Lennox Heat Exchanger Assembly — 70W08 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 — 70W08.

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.

IMAGE COMING SOON

Lennox

OEM Lennox Heat Exchanger Assembly — 70W08

Name: OEM Lennox Heat Exchanger Assembly — 70W08
Brand: Lennox
SKU: LNX-70W08
Price: 39.95 USD
Availability: InStock

SKU: LNX-70W08 Brand: Lennox

$39.95 $54.95

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014

SAM.gov Registered

Govt POs Accepted

The genuine OEM Lennox 70W08 heat exchanger assembly, cross-referenced as 605731-03 and replacing 604904-05, is a factory-specified heat-transfer component for your Lennox furnace. It captures heat from the burner and delivers it to the blower air stream while safely containing combustion gases away from your indoor air. Manufactured to exact Lennox standards, it provides the correct fit, alloy, and thermal performance for compatible models.

Years of heating cycles gradually fatigue heat exchanger metal. Indicators that the 70W08 needs replacement include cracks or rust on the cells, a flickering or rolling flame, soot buildup, unusual smells, repeated limit-switch shutdowns, or a tripped carbon monoxide alarm during operation. Because a failed exchanger is a safety concern, replace it without delay.

OEM matters for the Lennox 70W08 because aftermarket versions rarely match the original engineering, risking reduced efficiency, airflow restriction, and premature failure. This factory part restores safe, efficient heat and keeps your Lennox furnace performing as intended.

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...

$39.95

Frequently Asked Questions

Does this Heat Exchanger fit my Lennox OEM Lennox Heat Exchanger Assembly — 70W08?

Yes. This is the factory-specified OEM heat exchanger for the Lennox OEM Lennox Heat Exchanger Assembly — 70W08. 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 — 70W08?

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.

Menu

OEM Lennox Heat Exchanger Assembly — 70W08

Shipping Information

Return Policy

Frequently Asked Questions