Heading 8404: Auxiliary plant for use with boilers of heading 8402 or 8403 (for example, economizers…
Every line of heading 8404 in the U.S. Harmonized Tariff Schedule, with its general (column 1) duty rate. Open a code for the landed cost calculator, trade agreement rates and email alerts if the rate changes.
Auxiliary plant for use with boilers of heading 8402 or 8403 (for example, economizers, super-heaters, soot removers, gas recoverers); condensers for steam or other vapor power units; parts thereof
Chapter 84: Machinery, mechanical appliances, boilers and nuclear reactors. Schedule checked on November 8, 2026.
Not always the total: additional chapter 99 duties (such as Section 232 or Section 301), antidumping or countervailing duties may apply depending on the country of origin. See recent chapter 99 changes →
Tariff lines
| HTS code | Official description | General rate |
|---|---|---|
| 8404.10.00 | Auxiliary plant for use with boilers of heading 8402 or 8403 | 3.5% |
| 8404.10.00.10 | Economizers | |
| 8404.10.00.50 | Other | |
| 8404.20.00.00 | Condensers for steam or other vapor power units | 5% |
| 8404.90.00.00 | Parts | 3.5% |
Exporting this product from the U.S.?
Exports are reported with Schedule B numbers. Heading 8404 has 4 of them. Schedule B lookup →
- 8404.10.0010ECONOMIZERS FOR USE WITH BOILERS OF HEADING 8402 OR 8403
- 8404.10.0050AUXILIARY PLANT FOR USE WITH BOILERS OF HEADING 8402 OR 8403, EXCEPT ECONOMIZERS
- 8404.20.0000CONDENSERS FOR STEAM OR OTHER VAPOR POWER UNITS
- 8404.90.0000PARTS FOR AUXILIARY PLANT FOR USE WITH BOILERS OF HEADING 8402 OR 8403 AND CONDENSERS FOR STEAM OR OTHER VAPOR POWER UNITS
Source: U.S. International Trade Commission, Harmonized Tariff Schedule; Schedule B: U.S. Census Bureau. Information only, not legal or customs advice; U.S. Customs and Border Protection decides the classification and the duty. Confirm with a licensed customs broker before you ship.
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