What are the specs for this Heat Exchanger?

The correct replacement for Goodman model GMNT040-3B — 4821400S 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 GMNT040-3B — 4821400S.

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 14 in 2-Cell Heat Exchanger for GMNT040-3B — 4821400S

Name: OEM Goodman 14 in 2-Cell Heat Exchanger for GMNT040-3B — 4821400S
Brand: Goodman
SKU: GOODMAN-11615
Price: 395.95 USD
Availability: InStock

SKU: GOODMAN-11615 Brand: Goodman

$395.95 $519.95

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Goodman 4821400S 14" 2-Cell Heat Exchanger

The Goodman 4821400S is an OEM 14-inch, two-cell heat exchanger engineered as a direct replacement for the GMNT040-3B gas furnace. The heat exchanger is the heart of the furnace's combustion system, transferring heat from the burners to the circulating air while keeping flue gases safely separated from your indoor air. A cracked or rusted exchanger is a safety hazard, and replacing it with a genuine OEM assembly restores rated efficiency and combustion integrity.

Specifications

Type: Clamshell heat exchanger, 2-cell configuration
Nominal size: 14 inches
Fits: Goodman GMNT040-3B furnace
Material: Aluminized/corrosion-resistant steel
OEM Part Number: 4821400S
Brand: Goodman

OEM vs. Generic

This is a genuine Goodman OEM exchanger built to the exact cell geometry and metallurgy of the original. Generic exchangers may vary in cell spacing and weld quality, which can affect flame pattern, drum switch tripping, and long-term durability. For a combustion-side component, OEM fit is strongly recommended to preserve the manufacturer's safety rating and warranty coverage.

Install Difficulty

Advanced — Professional installation required. Heat exchanger replacement involves burner removal, gas line disconnection, and combustion re-verification with a CO analyzer. This repair should be performed only by a licensed HVAC technician.

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 14 in 2-Cell Heat Ex...

$395.95

Frequently Asked Questions

Does this Heat Exchanger fit my Goodman GMNT040-3B — 4821400S?

Yes. This is the factory-specified OEM heat exchanger for the Goodman GMNT040-3B — 4821400S. 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 GMNT040-3B — 4821400S?

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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