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HSChapter 84
U.S. imports of parts for auxiliary boiler plant and condenser power units (HS 840490) totaled $6.1M in July 2026, traded with 24 countries.
Importers of Parts for Auxiliary Boiler Plant and Condenser Power Units paid $974K in duties in July 2026 — an effective duty rate of 17% on $5.9M in dutiable value, based on actual customs collections rather than the published tariff schedule. Parts for Auxiliary Boiler Plant and Condenser Power Units imports of $6.1M in July 2026 ran 11% below the year-to-date monthly average of $6.9M.
Last updated: July 2026 dataGermany leads US imports of parts for auxiliary boiler plant and condenser power units, consistent with that country's deep industrial equipment manufacturing base. All such parts — whether replacement components for economizers, superheaters, or steam condensers — enter under a single 10-digit line, 8404900000, so the classification burden falls on demonstrating that the part is specifically designed for equipment of headings 8402–8404 rather than a general-purpose industrial component. Mexico is also a notable supplier, and USMCA origin qualification can affect duty treatment for parts sourced there.
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205 shipments/mo
When a part is designed to fit equipment in multiple headings, CBP's general rule is to classify by the principal use or the equipment it is presented with at time of import. If the tube bundle is invoiced and documented as a replacement for a specific economizer model under heading 8404, that specificity supports classification under 8404900000. Ambiguous dual-use parts may warrant a binding ruling request from CBP.
Parts originating in Mexico may qualify for preferential tariff treatment under USMCA, provided they meet the applicable rules of origin — typically a tariff classification change or regional value content threshold. Importers must obtain a valid USMCA certification of origin from the Mexican supplier and retain it for five years to support any preference claim.
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Subheading 2 of 3 in heading 8404
Subheading 840490 · $6.1M of $28.8M
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8404900000 | Parts for Aux Plt for Blrs,Cond for Stm,Vpr Pr Unt | $6.1M | 15.95% | 96.03% | $974K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8404900000 | Parts for Aux Plt for Blrs,Cond for Stm,Vpr Pr Unt | $4.3M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
ImportsExports
Imports
$6.1MYoY · Pro
Exports
$4.3MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Imports · July 2026
origin
Germany and Mexico together supply 77% of it.
customs district
destination
entry
rate provision · imports
20.8% enters free of duty; the effective duty rate is 15.95%.