U.S. imports of Superheated Water Boilers (HS 840220) totaled $1.4M in August 2026, imported from 16 countries.
Importers of Superheated Water Boilers paid $263K in duties in August 2026, an average duty rate of 18.46% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Superheated Water Boilers imports of $1.4M in August 2026 ran 275% above the year-to-date monthly average of $380K.
Last updated: August 2026 dataSuperheated water boilers — which circulate pressurized hot water above 100°C rather than generating steam — are widely used in district heating networks, large commercial HVAC systems, and industrial process heating. Classified under tariff line 8402200000, they are distinguished from steam boilers by their operating principle: the water remains liquid under pressure throughout the circuit. This design distinction is commercially significant because superheated water systems offer precise temperature control and lower energy losses over long distribution distances compared to steam-based alternatives.
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5 import shipments a month
The key distinction is the phase of the working fluid: a superheated water boiler keeps water in a liquid state under high pressure, while a steam boiler converts water to vapor. If a unit can operate in both modes, the primary design intent and the manufacturer's specification govern classification. CBP may request technical documentation to confirm the operating principle.
No — heading 840220 covers superheated water boilers regardless of their end-use application, whether district heating, industrial process, or commercial HVAC. The classification is determined by the equipment's design and operating principle, not by the sector in which it is deployed.
Subheading 5 of 5 in heading 8402
Subheading 840220 · $1.4M of $53.1M
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8402200000 | Super-Heated Water Boilers | $1.4M | 18.46% | 100.00% | $263K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8402200000 | Super-Heated Water Boilers | $200K |
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.
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ImportsExports
Imports
$1.4MYoY · free account
Exports
$200KYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $3.3M of Superheated Water Boilers and exported $4.1M.
Through August 2026. Source: U.S. Census Bureau.
Imports · August 2026
origin
Netherlands and Vietnam together supply 77% of it. China pays 40.8% duty; Netherlands 10.0%.
customs district
entry
rate provision · imports
duty collected equals 18.46% of imports for consumption.