What are the specs for this Heat Exchanger?

The correct replacement for Goodman model GMP100-3 Furnace — 2921306S 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 GMP100-3 Furnace — 2921306S.

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 Heat Exchanger for GMP100-3 Furnace — 2921306S

Name: OEM Goodman Heat Exchanger for GMP100-3 Furnace — 2921306S
Brand: Goodman
SKU: GOODMAN-2921306S
Price: 574.95 USD
Availability: InStock

SKU: GOODMAN-2921306S Brand: Goodman

$574.95 $739.95

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The Goodman 2921306S Heat Exchanger is a genuine OEM replacement for the Goodman GMP100-3 gas furnace. The heat exchanger is the heart of the furnace — it transfers heat from combustion gases to the circulating air stream while keeping flue products physically separated from your home's air. A cracked or corroded exchanger is a safety-critical failure that can allow carbon monoxide into the airflow, so it must be replaced with a correctly matched OEM part.

Specifications

OEM Part Number: 2921306S
Fits Model: Goodman GMP100-3
Category: Heat Exchanger
Equipment Type: 100,000 BTU-class Gas Furnace
Construction: Aluminized steel clamshell exchanger
Brand: Goodman (OEM)

OEM vs. Generic

Heat exchangers are one part where OEM is not optional. This factory unit matches the GMP100-3 burner alignment, cell geometry, and mounting exactly, ensuring proper flame impingement and thermal expansion behavior. Non-OEM exchangers risk misalignment, hot spots, and premature cracking. Genuine Goodman construction also protects any remaining furnace warranty.

Installation Difficulty

Expert / Professional Only — replacing a heat exchanger requires nearly full furnace disassembly, burner and manifold removal, and post-install combustion analysis. This is a safety-critical repair and should be completed by a licensed HVAC technician, followed by a CO test and draft verification.

Shut off gas and electrical power before any service. Confirm your furnace model and serial before ordering; contact info@nationalhvacparts.com for fitment help.

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 Heat Exchanger for G...

$574.95

Frequently Asked Questions

Does this Heat Exchanger fit my Goodman GMP100-3 Furnace — 2921306S?

Yes. This is the factory-specified OEM heat exchanger for the Goodman GMP100-3 Furnace — 2921306S. 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 GMP100-3 Furnace — 2921306S?

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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