Steam or other vapor generating boilers — HTS 8402
Steam or other vapor generating boilers (other than central heating hot water boilers capable also of producing low pressure steam); super-heated water boilers; parts thereof
Chapter 84 › Heading 8402
2026 HTS Rev 19 Synced Rules verified Operational
Written to help non-specialists understand this page. Rates, dates, and legal facts come from the official records above and on the linked source.
HTS heading 8402 covers industrial equipment that generates steam or vapor, along with super-heated water boilers and their parts. It generally includes boilers that produce steam for power generation, manufacturing, processing, or similar uses, but excludes central-heating hot-water boilers that can also produce only low-pressure steam. The heading is a broad 4-digit category, not the final classification used for most entries.
To reach the correct 8-digit HTSUS code, first identify whether the item is a complete boiler, a super-heated water boiler, or a part. Then follow the heading’s subheadings and statistical breakouts, which commonly distinguish products by design, operating characteristics, or material and construction details. Confirm the exact wording and any relevant chapter notes in the current HTSUS, because a similar-looking heating unit or component may belong elsewhere.
What to check
- Describe the equipment’s function, fuel or heat source, operating pressure and temperature, and whether it generates steam, vapor, or super-heated water.
- Determine whether you are classifying a complete boiler or a part, and verify that the part is designed principally for the covered boiler equipment.
- Check the product’s construction materials and any type or capacity distinctions required by the 8-digit subheading.
- Compare the heading notes and exclusions with the product’s technical specifications, especially for central-heating equipment and low-pressure steam systems.
- Use manufacturer drawings, manuals, nameplates, and engineering data to support the classification; ask a customs broker or obtain a binding ruling if the wording remains unclear.
HTS heading 8402 summary
Steam or other vapor generating boilers is a 4-digit product category containing 5 published product-code lines in this snapshot. A heading does not carry one universal duty rate; classification must be narrowed to the line matching the product facts.
How to find your code in this category
A heading is a product category. To get the exact duty, narrow from this 4-digit heading to a sub-category (usually by material), then open the 8-digit code that matches your product.
Open any code in the tables below to see its exact duty rate, a duty calculator (enter your shipment value → estimated duty and landed cost), the rate-change history chart, and the country-by-country breakdown (including Section 301/232 add-on duties).
Why you have to click in: a single category can contain products with very different duties. The rate depends on the specific product — its material and construction — and on the country of origin, and those only get pinned down at the 8-digit code level. That is why this page points you to codes instead of showing one rate for the whole category.
Product codes & duty rates
👇 Each row is a specific product code — click a blue code to open its full page with exact duty rates by country, the rate-history chart, and a duty calculator. 👉
| Code | Description | General (MFN) | Special | Column 2 |
|---|---|---|---|---|
| 8402.11.00.00 👉 | Watertube boilers with a steam production exceeding 45 t per hour | 5.2% | Free | 45% |
| 8402.12.00.00 👉 | Watertube boilers with a steam production not exceeding 45 t per hour | 4.3% | Free | 45% |
| 8402.19.00.00 👉 | Other vapor generating boilers, including hybrid boilers | 5.2% | Free | 45% |
| 8402.20.00.00 👉 | Super-heated water boilers | 3.3% | Free | 45% |
| 8402.90.00 👉 | Parts | 4.3% | Free | 45% |
"Special" shows the free-trade-agreement rate; open a code to see exactly which countries qualify.
Common questions
What products fall under HTS heading 8402?
Steam or other vapor generating boilers (other than central heating hot water boilers capable also of producing low pressure steam); super-heated water boilers; parts thereof. To classify a specific item you must pick the matching sub-category and 8-digit code above; the right choice usually depends on the material and construction of the product.
How do I choose the right code within this category?
Start from the sub-categories (typically divided by material—for example cotton versus man-made fibers), then open the active 8- or 10-digit code that matches the product. When unsure, a licensed customs broker or a CBP binding ruling can confirm the classification.
Reference information only, not customs, legal, or classification advice. Confirm the current code and rate against the official HTS before you import.