Official data Source: US Census Bureau international trade data
Track this productParts for super-heated water boilers and steam or other vapor generation boilers (other than central heating hot water boilers)
In short
- The US imported $308.5M of this product over the 12 months to August 2026, up 116% on the year before.
- Vietnam is the largest supplier, with 55.1% of US imports; Korea, South is next, with 15.0%.
- Duty paid averaged 15.7% of the value of imports in August 2026, down 2.3 points on a year earlier.
- Korea, South is gaining share: 32.3% over the last 12 months, up from 21.7%.
- US exports were $81.5M over the last 12 months; the largest market is Canada, with 30.2%.
US imports, Aug 2026
$45.7M
↑ +386% vs Aug 2025
Last 12 months
$308.5M
↑ +116% vs the 12 months before
Average duty paid
15.7%
↓ −2.3 pts vs Aug 2025
Top supplier
Vietnam
55.1% of US imports
US imports by month
The last 13 months, so the same month a year ago is on the left. August 2026 is highlighted. Dotted lines mark lasting changes in duty paid, labelled with the supplier, or "Duty" when several moved; the tariff timeline lists each one with its notices.
Show the numbers
| Month | US imports |
|---|---|
| August 2025 | $9.4M |
| September 2025 | $6.4M |
| October 2025 | $8.2M |
| November 2025 | $6.2M |
| December 2025 | $14.4M |
| January 2026 | $25.8M |
| February 2026 | $10.0M |
| March 2026 | $20.7M |
| April 2026 | $17.0M |
| May 2026 | $20.3M |
| June 2026 | $50.2M |
| July 2026 | $83.4M |
| August 2026 | $45.7M |
What changed
- US imports were $45.7M in August 2026, down 45% from July 2026 and up 386% from August 2025.
- Over the 12 months to August 2026 they totalled $308.5M, up 116% on the 12 months before.
- Biggest moves in market share since July 2026: Vietnam up from 22.9% to 55.1%, Korea, South down from 55.2% to 15.0%.
- Duty paid on imports from Thailand fell from 14.3% to 8.8% of their value since July 2026.
- Duty paid on imports from China rose from 36.5% to 39.7% of their value since July 2026.
US trade by year
US imports were $308.5M in the 12 months to Aug 2026, up 29% on the 12 months to Aug 2017. US exports were $81.5M, down 31%. In January 2022 the HS 2022 revision moved some goods between this code and 8549.21, 8549.29, 8549.31 and 3 more, so part of a change across the dashed line can be the revision. Dotted lines mark lasting changes in duty paid, labelled with the supplier, or "Duty" when several moved; the tariff timeline lists each one with its notices.
Show the numbers
| Period | US imports |
|---|---|
| 12 months to Aug 2017 | $238.5M |
| 12 months to Aug 2018 | $174.3M |
| 12 months to Aug 2019 | $100.2M |
| 12 months to Aug 2020 | $179.3M |
| 12 months to Aug 2021 | $150.6M |
| 12 months to Aug 2022 | $96.8M |
| 12 months to Aug 2023 | $114.8M |
| 12 months to Aug 2024 | $175.6M |
| 12 months to Aug 2025 | $142.9M |
| 12 months to Aug 2026 | $308.5M |
- Korea, South
- Vietnam
- Thailand
- Mexico
- All countries
Show the numbers
| Period | Korea, South | Vietnam | Thailand | Mexico |
|---|---|---|---|---|
| 12 months to Aug 2017 | 9.1% | 0.0% | 9.2% | 3.6% |
| 12 months to Aug 2018 | 28.0% | 4.3% | 7.5% | 6.1% |
| 12 months to Aug 2019 | 13.2% | 0.9% | 4.4% | 10.6% |
| 12 months to Aug 2020 | 33.1% | 25.3% | 7.4% | 12.1% |
| 12 months to Aug 2021 | 20.9% | 33.5% | 4.4% | 17.6% |
| 12 months to Aug 2022 | 12.8% | 3.8% | 10.0% | 26.9% |
| 12 months to Aug 2023 | 14.0% | 20.9% | 4.8% | 19.1% |
| 12 months to Aug 2024 | 28.5% | 25.4% | 6.4% | 7.9% |
| 12 months to Aug 2025 | 21.7% | 18.6% | 11.3% | 9.4% |
| 12 months to Aug 2026 | 32.3% | 23.7% | 8.4% | 7.0% |
Show the numbers
| Period | Korea, South | Vietnam | Thailand | Mexico | All countries |
|---|---|---|---|---|---|
| 12 months to Aug 2017 | 0.9% | 4.3% | 2.5% | 0.2% | 3.3% |
| 12 months to Aug 2018 | 1.5% | 4.3% | 0.3% | 0.8% | 2.9% |
| 12 months to Aug 2019 | 0.1% | 4.3% | 0.1% | 1.1% | 7.7% |
| 12 months to Aug 2020 | 3.5% | 4.3% | 1.7% | 0.2% | 4.1% |
| 12 months to Aug 2021 | 1.6% | 4.3% | 0.5% | 0.4% | 4.0% |
| 12 months to Aug 2022 | 0.0% | 4.3% | 0.6% | 0.2% | 7.5% |
| 12 months to Aug 2023 | 3.5% | 4.3% | 0.8% | 0.3% | 8.4% |
| 12 months to Aug 2024 | 3.8% | 4.3% | 0.8% | 0.2% | 5.5% |
| 12 months to Aug 2025 | 9.0% | 6.1% | 1.1% | 0.4% | 10.6% |
| 12 months to Aug 2026 | 12.8% | 14.9% | 14.6% | 0.2% | 13.6% |
| Period | US imports | Duty paid | US exports |
|---|---|---|---|
| 12 months to Aug 2026 | $308.5M+116% | 13.6%+3.0 pts | $81.5M−27% |
| 12 months to Aug 2025 | $142.9M−19% | 10.6%+5.1 pts | $111.9M+7.1% |
| 12 months to Aug 2024 | $175.6M+53% | 5.5%−2.9 pts | $104.5M+7.0% |
| 12 months to Aug 2023 | $114.8M+19% | 8.4%+0.9 pts | $97.6M−29% |
| 12 months to Aug 2022HS 2022 revision | $96.8M−36% | 7.5%+3.6 pts | $137.5M+33% |
| 12 months to Aug 2021 | $150.6M−16% | 4.0%−0.1 pts | $103.8M−7.5% |
| 12 months to Aug 2020 | $179.3M+79% | 4.1%−3.6 pts | $112.2M−7.8% |
| 12 months to Aug 2019 | $100.2M−42% | 7.7%+4.8 pts | $121.7M+4.5% |
| 12 months to Aug 2018 | $174.3M−27% | 2.9%−0.4 pts | $116.5M−1.1% |
| 12 months to Aug 2017 | $238.5M | 3.3% | $117.8M |
Who supplies the US
August 2026. Small figures under each value are the change from August 2025. Average prices aren't shown because this product's lines are counted in different units.
| Country | US imports | Share | Average price | Duty paid | Last 13 months |
|---|---|---|---|---|---|
| Vietnam | $25.2M | 55.1%new | n/a | 16.2% | |
| Korea, South | $6.9M | 15.0%−26.9 pts | n/a | 12.9%+0.1 pts | |
| Thailand | $4.4M | 9.7%+8.3 pts | n/a | 8.8%−1.0 pts | |
| China | $3.8M | 8.2%−6.2 pts | n/a | 39.7%−19.6 pts | |
| Italy | $1.1M | 2.3%new | n/a | 0.3% | |
| Canada | $894K | 2.0%−4.4 pts | n/a | 1.9%−6.8 pts | |
| Mexico | $860K | 1.9%−10.9 pts | n/a | 0.0%−0.1 pts | |
| Finland | $711K | 1.6%new | n/a | 10.0% | |
| Other countries (15) | $2.0M | 4.3%−0.9 pts | n/a | 11.2%−3.1 pts | |
| All countries | $45.7M | 100.0% | n/a | 15.7%−2.3 pts |
The 3 largest suppliers had 64.4% of US imports over the last 12 months.
How the market is shifting
Korea, South gained the most share: 32.3% of US imports over the last 12 months, up from 21.7% in the 12 months before. China lost the most: 7.0%, down from 15.1%. The charts show September 2024 to August 2026 for the 4 largest suppliers over the last 12 months. Dotted lines mark lasting changes in duty paid, labelled with the supplier, or "Duty" when several moved; the tariff timeline lists each one with its notices.
- Korea, South
- Vietnam
- Thailand
- Mexico
- All countries
Show the numbers
| Month | Korea, South | Vietnam | Thailand | Mexico |
|---|---|---|---|---|
| September 2024 | 22.7% | 5.9% | 24.0% | 12.6% |
| October 2024 | 43.7% | 0.2% | 0.5% | 8.2% |
| November 2024 | 10.9% | 12.6% | 0.0% | 20.6% |
| December 2024 | 28.2% | 44.3% | 0.3% | 5.6% |
| January 2025 | 3.8% | 40.2% | 1.1% | 4.1% |
| February 2025 | 17.2% | 21.7% | 9.4% | 5.0% |
| March 2025 | 9.4% | 34.8% | 2.4% | 13.3% |
| April 2025 | 10.6% | 0.0% | 0.0% | 27.9% |
| May 2025 | 0.1% | 0.0% | 19.0% | 12.7% |
| June 2025 | 38.8% | 15.3% | 31.1% | 4.1% |
| July 2025 | 0.0% | 1.3% | 1.3% | 22.3% |
| August 2025 | 42.0% | 0.0% | 1.3% | 12.8% |
| September 2025 | 1.6% | 13.4% | 39.1% | 20.8% |
| October 2025 | 13.6% | 6.3% | 0.7% | 18.5% |
| November 2025 | 0.8% | 0.2% | 0.7% | 24.7% |
| December 2025 | 8.4% | 0.6% | 34.5% | 15.9% |
| January 2026 | 45.9% | 10.3% | 0.7% | 8.5% |
| February 2026 | 5.3% | 0.6% | 1.9% | 25.7% |
| March 2026 | 11.9% | 26.0% | 3.2% | 12.5% |
| April 2026 | 19.1% | 40.2% | 4.4% | 11.1% |
| May 2026 | 16.2% | 44.0% | 2.4% | 5.0% |
| June 2026 | 45.5% | 6.9% | 16.2% | 4.8% |
| July 2026 | 55.2% | 22.9% | 4.3% | 1.7% |
| August 2026 | 15.0% | 55.1% | 9.7% | 1.9% |
Show the numbers
| Month | Korea, South | Vietnam | Thailand | Mexico | All countries |
|---|---|---|---|---|---|
| September 2024 | 4.3% | 4.3% | 4.3% | 0.0% | 7.7% |
| October 2024 | 4.3% | 4.3% | 4.3% | 0.0% | 10.3% |
| November 2024 | 4.2% | 4.3% | n/a | 0.0% | 3.6% |
| December 2024 | 4.3% | 4.3% | 4.3% | 0.0% | 4.5% |
| January 2025 | 4.3% | 4.3% | 4.3% | 0.6% | 4.7% |
| February 2025 | 4.3% | 4.3% | 1.2% | 0.0% | 8.3% |
| March 2025 | 2.5% | 4.3% | 4.2% | 1.9% | 8.0% |
| April 2025 | 0.0% | n/a | n/a | 0.0% | 18.2% |
| May 2025 | 14.3% | n/a | 0.3% | 0.0% | 28.7% |
| June 2025 | 14.3% | 14.3% | 0.0% | 0.0% | 9.1% |
| July 2025 | n/a | 14.3% | 0.5% | 0.3% | 21.7% |
| August 2025 | 12.8% | n/a | 9.7% | 0.1% | 17.9% |
| September 2025 | 15.1% | 24.3% | 14.6% | 0.3% | 18.8% |
| October 2025 | 16.0% | 24.3% | 23.3% | 0.3% | 8.8% |
| November 2025 | 15.0% | 24.3% | 23.3% | 0.0% | 12.1% |
| December 2025 | 15.0% | 24.3% | 23.3% | 0.1% | 12.6% |
| January 2026 | 15.0% | 24.3% | 23.3% | 0.0% | 13.7% |
| February 2026 | 9.5% | 4.6% | 23.3% | 0.0% | 9.1% |
| March 2026 | 8.2% | 14.3% | 14.8% | 0.4% | 11.8% |
| April 2026 | 14.3% | 14.3% | 14.3% | 0.0% | 14.9% |
| May 2026 | 12.0% | 14.3% | 14.3% | 0.0% | 13.7% |
| June 2026 | 14.3% | 14.3% | 12.2% | 0.0% | 15.0% |
| July 2026 | 11.6% | 14.3% | 14.3% | 1.1% | 12.8% |
| August 2026 | 12.9% | 16.2% | 8.8% | 0.0% | 15.7% |
Tariff actions touching this product
When the duty paid on this product changed and stayed changed, for its main suppliers and all countries, newest first, with the Federal Register notices that named the product in the 3 months before. Rates are medians of the 4 months either side, less any usual seasonal swing. A change shows what happened to duty paid, not why; read each notice for what it did.
- February 2026 · Duty paid: China 49.7% → 28.8%.
- April–September 2025 · Duty paid: Korea, South 2.5% → 15.2%, China 31.5% → 59.1%, all countries 6.2% → 11.8%.
- February 2024 · Duty paid: all countries 10.1% → 3.9%.
- September 2022 · Duty paid: all countries 6.4% → 11.8%.
- January 2022 · Duty paid: all countries 3.5% → 12.0%. This is around the January 2022 HS revision, which moved goods in or out of this code.
- February 2020 · Duty paid: China 17.2% → 27.5%.
- September–November 2019 · Duty paid: China 29.2% → 20.3%, all countries 9.6% → 4.5%.
- June 2019 · Duty paid: all countries 4.3% → 10.2%.
- August 2018 · Duty paid: China 4.3% → 29.2%.
Where it enters the US
Main ports of entry over the 12 months to August 2026: US imports and share.
Where US exports go
US exports were $7.0M in August 2026, down 6.2% from August 2025, and $81.5M over the last 12 months, down 27% on the 12 months before. Fastest-growing market with 3% or more of US exports: Malaysia, up 796%.
| Market | Last 12 months | Share | vs 12 months before |
|---|---|---|---|
| Canada | $24.6M | 30.2% | −56% |
| China | $9.5M | 11.7% | +314% |
| Belgium | $5.6M | 6.8% | −4.5% |
| Mexico | $5.0M | 6.2% | −36% |
| Thailand | $4.8M | 5.9% | +388% |
| Malaysia | $3.3M | 4.0% | +796% |
| Netherlands | $3.0M | 3.7% | +77% |
| Israel | $2.1M | 2.6% | +562% |
| Other countries (77) | $23.6M | 28.9% | −35% |
| All countries | $81.5M | 100.0% | −27% |
Markets abroad
Each country's own import figures for this product, from UN Comtrade: the 8 biggest importers outside the US in the latest year each has reported, what they bought from the US, and the change from the year before. Values usually include freight and insurance to the importer's border, so they run a little above US export figures. Countries report a year or more late; 121 have reported 2025 so far. Where a country's figure for imports from the US is under half or over double what the US recorded exporting there that year, the US figure is shown under it.
| Market | Imports | vs year before | From the US | US share |
|---|---|---|---|---|
| Saudi Arabia | $429.4Min 2025 | +537% | $2.9M | 0.7% |
| Indonesia | $85.4Min 2025 | −74% | $132K | 0.2% |
| China | $67.0Min 2025 | +19% | $7K | 0.0% |
| Japan | $57.1Min 2025 | −35% | $90K | 0.2% |
| Korea, South | $54.0Min 2025 | +82% | $1.2MUS records $5.6M | 2.2% |
| Canada | $53.2Min 2025 | −37% | $34.4M | 64.7% |
| Taiwan | $53.1Min 2024 | −52% | $1.9M | 3.5% |
| Singapore | $49.4Min 2025 | +46% | $1.1M | 2.2% |
The biggest market outside the US is Saudi Arabia, which imported $429.4M of this product in 2025, 0.7% of that from the US.
The US supplies 64.7% of imports into Canada, but under 10% into Saudi Arabia, Indonesia and China.
Of these, imports into Saudi Arabia grew fastest: up 537% from 2024 to 2025.
Related products
Other products under heading 8402: steam or other vapor generating boilers not elsewhere specified; super-heated water boilers; parts thereof. US trade over the 12 months to August 2026.
| Product | US imports | US exports |
|---|---|---|
| Vapor generating boilers, not elsewhere specified, including hybrid boilersHS 8402.19 | $19.3M | $33.3M |
| Watertube boilers with a steam production exceeding 45 t per hourHS 8402.11 | $30.9M | $9.6M |
| Watertube boilers with a steam production not exceeding 45 t per hourHS 8402.12 | $15.8M | $13.5M |
| Super-heated water boilersHS 8402.20 | $3.3M | $4.1M |
About these figures
- Source: US Census Bureau international trade data, not seasonally adjusted, in US dollars. Retrieved November 3, 2026.
- US imports are general imports at customs value, which excludes freight and insurance. Exports are at free-alongside-ship value.
- Average price is customs value divided by quantity, across all of the product's 10-digit lines.
- Duty paid is the duty Census calculates on each country's imports for consumption, as a share of their value. It moves with tariff changes, exemptions and the mix of goods within the product.
- Markets abroad are each country's imports as it reports them to UN Comtrade, in US dollars, usually including freight and insurance. Countries report a year or more late and in their own edition of the HS codes, so one still on an older edition is missing for codes that changed in 2022.
- Census revises recent months, so figures can change slightly. These are estimates for research and planning, not customs or legal advice.