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HSChapter 84
U.S. imports of auxiliary plant for use with steam, vapor, and central heating boilers (HS 840410) totaled $4.5M in April 2026, traded with 16 countries.
Importers of Auxiliary Plant for Use with Steam, Vapor, and Central Heating Boilers paid $399K in duties in April 2026 — an effective duty rate of 30% on $1.3M in dutiable value, based on actual customs collections rather than the published tariff schedule. Auxiliary Plant for Use with Steam, Vapor, and Central Heating Boilers imports of $4.5M in April 2026 ran 60% below the year-to-date monthly average of $11.3M.
Last updated: April 2026 dataEconomizers — heat-recovery devices that preheat feedwater using exhaust gases — are specifically broken out at the 10-digit level (8404100010) from other auxiliary plant (8404100050), making correct sub-classification critical for importers of boiler support equipment. Canada is the leading supplier to the US market under this heading, with Thailand and Israel also notable sources. Auxiliary plant in this heading serves power generation, industrial process heating, and district energy systems, so end-use documentation can be important when equipment crosses multiple application categories.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
An economizer is specifically a heat-recovery device that uses flue or exhaust gases to preheat boiler feedwater, improving thermal efficiency. Under HTS 8404100010, economizers for use with boilers of headings 8402–8403 are separately classified. Other auxiliary equipment — such as superheaters, soot blowers, and gas recovery apparatus — falls under 8404100050 when not meeting the economizer definition.
There is no mandatory admissibility review by a regulatory agency for auxiliary boiler plant as industrial equipment. However, large capital equipment may require coordination with the buyer's engineering team to confirm compliance with ASME or other applicable pressure-vessel standards, and certain power-plant components may be subject to export controls in the country of origin.
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Monthly import values over time
| Country | Imports | Exports | Balance |
|---|---|---|---|
| CANADA | $3.2M | $3.4M | +$232K |
| CHINA | $876K | $400K | -$476K |
| DOMINICAN REPUBLIC | -- | $395K | +$395K |
| ECUADOR | -- | $255K | +$255K |
| MALAYSIA | $177K | -- | -$177K |
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 8404100050 | AUX PLT FOR USE WITH BLRS,HDG 8402-8403,NOT ECNMZR | $4.2M | 32.31% | $337K |
| 8404100010 | ECONOMIZERS FOR USE WITH BOILERS OF HEAD 8402-8403 | $287K | 21.40% | $61K |
AUX PLT FOR USE WITH BLRS,HDG 8402-8403,NOT ECNMZR
ECONOMIZERS FOR USE WITH BOILERS OF HEAD 8402-8403
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8404100050 | AUX PLT FOR USE WITH BLRS,HDG 8402-8403,NOT ECNMZR | $4.1M |
| 8404100010 | ECONOMIZERS FOR USE WITH BOILERS OF HEAD 8402-8403 | $710K |
AUX PLT FOR USE WITH BLRS,HDG 8402-8403,NOT ECNMZR
320 t
ECONOMIZERS FOR USE WITH BOILERS OF HEAD 8402-8403
34 t
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
| Port | Imports | Exports | Balance |
|---|---|---|---|
| PORT HURON, MI | $2.5M | $59K | -$2.5M |
| PORTAL, ND | -- | $1.3M | +$1.3M |
| SWEETGRASS, MT | -- | $1.3M | +$1.3M |