Auxiliary plant for use with steam or other vapor generating boilers, super-heated water boilers and central heating boilers

US trade by year

US imports were $105.6M in the 12 months to Aug 2026, up 59% on the 12 months to Aug 2017. US exports were $28.9M, down 54%. 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.

• Thailand
• Canada
• Korea, South
• China
• All countries

Who supplies the US

August 2026. Small figures under each value are the change from August 2025. Landed cost by origin, below, adds freight and duty to the price.

The 3 largest suppliers had 86.1% of US imports over the last 12 months.

Landed cost by origin

What importers paid to land this product at a US port from each main supplier, June–August 2026: the price, freight and insurance to the first US port, and duty, per unit. Suppliers with 3% or more of these imports, cheapest landed first. Small figures under landed cost are the change from the same months a year earlier.

• Price
• Freight and insurance
• Duty

Landed at a US port, Canada was cheapest, at $9,922/tonne: 76.6% below Thailand.

Landed cost from Thailand rose 679% on a year earlier, to $42,402/tonne, mostly on price: $4,283/tonne then, $39,995/tonne now.

How the market is shifting

Thailand gained the most share: 51.4% of US imports over the last 12 months, up from 9.3% in the 12 months before. Canada lost the most: 30.0%, down from 68.9%. 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.

• Thailand
• Canada
• Korea, South
• China
• All countries

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.

1. April–June 2026 · Duty paid: China 48.5% → 38.5%, all countries 9.7% → 1.5%.
2. May 2022 · Duty paid: all countries 9.0% → 1.3%.
3. November 2021 · Duty paid: all countries 2.7% → 8.7%. This is around the January 2022 HS revision, which moved goods in or out of this code.
4. March 2021 · Duty paid: all countries 10.8% → 0.9%.
5. October 2020 · Duty paid: all countries 2.4% → 10.8%.
6. March 2020 · Duty paid: all countries 12.4% → 0.8%.
7. October 2019 · Duty paid: all countries 1.1% → 12.4%.

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; 110 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.

The biggest market outside the US is France, which imported $33.4M of this product in 2025, under 0.1% of it from the US.

Of these, imports into France grew fastest: up 204% from 2024 to 2025.

Related products

Other products under heading 8404: auxiliary plant for use with boilers (steam or other vapor generating, super-heated and central heating); vapor power unit condensers; parts thereof. US trade over the 12 months to August 2026.