U.S. imports of Central Heating Boilers (HS 840310) totaled $20.7M in September 2026, imported from 21 countries.
Importers of Central Heating Boilers paid $5.1M in duties in September 2026, an average duty rate of 24.57% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: September 2026 dataHot-water central heating boilers — the type installed in residential and commercial buildings to supply radiators or underfloor heating circuits — are classified under tariff line 8403100000, separate from the industrial steam and superheated water boilers of heading 8402. Condensing gas boilers, oil-fired boilers, and combination (combi) boilers all fall here provided they are designed for space heating rather than industrial steam generation. European manufacturers are prominent suppliers of high-efficiency condensing boiler technology, and importers should verify compliance with applicable energy efficiency and safety standards (such as ASME or ANSI ratings) required by US state and local codes.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
757 import shipments a month
Yes, combination boilers designed primarily for central heating service classify under 8403100000 even if they also supply domestic hot water. The central heating function governs classification. If a unit is designed primarily as a water heater with an incidental heating function, it may instead fall under heading 8419 or 8516, so the manufacturer's primary design intent is the determining factor.
While there is no single federal product approval for heating boilers, many US states and localities require compliance with ASME Boiler and Pressure Vessel Code standards, and efficiency ratings may need to meet Department of Energy minimum standards for commercial boilers. Importers should confirm applicable state-level requirements and obtain relevant certifications before distribution.
ImportsExports
Imports
$20.7MYoY · free account
Exports
—YoY · free account
12-mo low · imports
Low · free accountOver the twelve months to September 2026, the U.S. imported $278.6M of Central Heating Boilers.
Through September 2026 · exports 11 of 12 months reported. Source: U.S. Census Bureau.
Subheading 1 of 2 in heading 8403
Subheading 840310 · $20.7M of $34.0M
Trade Directory
List your company under HS 840310 — Central Heating Boilers, so the companies trading it can find you. Be the first supplier listed.
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 |
|---|---|---|---|---|---|
| 8403100000 | Central Heating Boilers | $23.0M | 24.89% | 99.80% | $5.7M |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8403100000 | Central Heating Boilers | $8.9M |
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.
Imports · September 2026
origin
Canada and South Korea together supply 61% of it.
customs district
destination
entry
rate provision · imports
0.1% enters free of duty; duty collected equals 24.57% of imports for consumption.