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HSChapter 84
U.S. imports of parts for auxiliary boiler plant and condenser power units (HS 840490) totaled $11.1M in April 2026, traded with 22 countries.
Importers of Parts for Auxiliary Boiler Plant and Condenser Power Units paid $1.1M in duties in April 2026 — an effective duty rate of 14% on $7.6M 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 $11.1M in April 2026 ran 52% above the year-to-date monthly average of $7.3M.
Last updated: April 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.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
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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Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 8404900000 | PARTS FOR AUX PLT FOR BLRS,COND FOR STM,VPR PR UNT | $11.1M | 14.09% | $1.1M |
PARTS FOR AUX PLT FOR BLRS,COND FOR STM,VPR PR UNT
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8404900000 | PARTS FOR AUX PLT FOR BLRS,COND FOR STM,VPR PR UNT | $1.9M |
PARTS FOR AUX PLT FOR BLRS,COND FOR STM,VPR PR UNT
74.4K kg
DIGITAL PROCESSING UNITS, N.E.S.O.I.
HS 847150
PARTS & ACCESSORIES FOR ADP MACHINES & UNITS
HS 847330
PORT DIGTL AUTOMATIC DATA PROCESS MACH NOT > 10 KG
HS 847130
AUTOMATIC DATA PROCESSING STORAGE UNITS, N.E.S.O.I
HS 847170
AUTOMATIC DATA PROCESSING UNITS, N.E.S.O.I.
HS 847180
TURBOJET AND TURBOPROLLER PARTS
HS 841191
| State | Imports | Exports | Balance |
|---|---|---|---|
| Florida | $6.8M | $32K | -$6.8M |
| Ohio | $2.5M | $401K | -$2.1M |
| California | $227K | $580K | +$353K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| MIAMI INTERNATIONAL AIRPORT, FL | $3.6M | $62K | -$3.5M |
| LAREDO, TX | $2.4M | $18K | -$2.3M |
| DENVER, CO | $1.2M | -- | -$1.2M |