What are the specs for this Heat Exchanger?

The correct replacement for Goodman model GDT070-3 — 2921308S 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 Goodman equipment which lists the model number GDT070-3 — 2921308S.

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.

Is this heat exchanger compatible with Bryant or Payne systems too?

Many Goodman parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

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Goodman

OEM Goodman 6-Cell Aluminized Steel Heat Exchanger for GDT070-3 — 2921308S

Name: OEM Goodman 6-Cell Aluminized Steel Heat Exchanger for GDT070-3 — 2921308S
Brand: Goodman
SKU: GOODMAN-10415
Price: 755.95 USD
Availability: InStock

SKU: GOODMAN-10415 Brand: Goodman

$755.95 $982.99

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Goodman 2921308S 6-Cell Heat Exchanger

The Goodman 2921308S is a genuine OEM 6-cell clamshell heat exchanger engineered specifically for the GDT070-3 gas furnace and compatible Goodman/Amana 70,000 BTU platforms. The heat exchanger is the heart of your furnace — it transfers combustion heat to the air stream while keeping flue gases sealed away from your home's air. A cracked or corroded exchanger is a safety concern and a common failure on aging furnaces; replacing it with the correct factory part restores safe, efficient heating.

Specifications

Cell count: 6-cell clamshell design
Material: aluminized steel for corrosion resistance
Fits Goodman GDT070-3 (70K BTU) furnaces
Direct OEM replacement — no modification required
Part number: 2921308S

OEM vs. Generic

This is a genuine Goodman OEM exchanger. Because the heat exchanger is a combustion-critical, safety-rated component, we strongly recommend OEM only. Generic exchangers are rarely offered for this application, and dimensional or metallurgical differences can compromise the seal, cause premature cracking, or void your furnace warranty. Factory tooling guarantees exact cell geometry and burner alignment.

Installation Difficulty

Advanced / Professional Recommended. Replacing a heat exchanger requires disassembly of the furnace, gas and electrical disconnection, and a post-install combustion and leak check. This repair should be performed by a licensed HVAC technician, and many jurisdictions require it.

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 Goodman 6-Cell Aluminized St...

$755.95

Frequently Asked Questions

Does this Heat Exchanger fit my Goodman GDT070-3 — 2921308S?

Yes. This is the factory-specified OEM heat exchanger for the Goodman GDT070-3 — 2921308S. 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 Goodman GDT070-3 — 2921308S?

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 Goodman 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 Goodman 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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