Analysis
HTS 8419.50.50 covers heat exchange units: other under heading 8419 (machinery, plant or laboratory equipment, whether or not electrically heated (excluding…).
Within this group the rate runs from duty-free to 4.2%. Compared with 8419.89.95 (other: other), which pays 4.2%, a misclassification either way moves the duty by 4.2 percentage points.
Goods from countries without normal trade relations pay the column 2 rate of 35% instead of nothing, so origin decides between free entry and a 35% duty.
The normal trade relations rate here is zero, shared by about 61% of the 823 tariff lines in chapter 84, a useful check when a neighbouring dutiable line is a candidate. Chapter 99 measures such as Section 301 or 232 can still apply on top, depending on where the goods come from.
Census statistics map these goods to NAICS 332410 (Power Boiler and Heat Exchanger Manufacturing), an industry of 237 US establishments employing 23,734 people. That concordance is how imports of this line are compared with US output.
Every edition we compared, from Jan 2023 to Oct 2026 (Rev. 22), shows the same general rate of Free.
Neighbouring lines
| Line | Description | General rate |
|---|---|---|
| 8419.11.00 | Instantaneous gas water heaters | Free |
| 8419.12.00 | Solar water heaters | Free |
| 8419.19.01 | Instantaneous or storage water heaters, nonelectric: other | Free |
| 8419.20.00 | Medical, surgical or laboratory sterilizers | Free |
| 8419.33.10 | For agricultural products | Free |
| 8419.33.50 | Lyophilisation apparatus, freeze drying units and spray dryers: other | Free |
| 8419.34.00 | Dryers: other, for agricultural products | Free |
| 8419.35.10 | Other, for wood, paper pulp, paper or paperboard: for wood | Free |
| 8419.35.50 | Other, for wood, paper pulp, paper or paperboard: other | Free |
| 8419.39.02 | Dryers: other | Free |
| 8419.40.00 | Distilling or rectifying plant | Free |
| 8419.50.10 | Brazed aluminum plate-fin heat exchangers | 4.2% |
| 8419.60.10 | Machinery containing brazed aluminum plate-fin heat exchangers | 4.2% |
| 8419.60.50 | Machinery for liquefying air or other gases: other | Free |
| 8419.81.50 | Cooking stoves, ranges and ovens | Free |
| 8419.81.90 | For making hot drinks or for cooking or heating food: other | Free |
| 8419.89.10 | For making paper pulp, paper or paperboard | Free |
| 8419.89.60 | Molten-salt-cooled acrylic acid reactors | Free |
| 8419.89.95 | Other: other | 4.2% |
| 8419.90.10 | Of instantaneous or storage water heaters | Free |
| 8419.90.20 | Of machinery and plant for making paper pulp, paper or paperboard | Free |
| 8419.90.30 | Of heat exchange units | Free |
| 8419.90.50 | Of molten-salt-cooled acrylic acid reactors; of medical, surgical or laboratory sterilizers | Free |
| 8419.90.85 | Of electromechanical tools for working in the hand with self-contained electric motor | Free |
| 8419.90.95 | Other: other | 4% |