# United States tariff line 8402.12.00.00: Watertube boilers with a steam production not exceeding 45 t per hour

> In the United States tariff, line 8402.12.00.00 covers steam or other vapor generating boilers, watertube boilers with a steam production not exceeding 45 t per hour. The general (MFN) duty rate is 4.3%. It falls under HS subheading 8402.12 in heading 84.02 (chapter 84).

Source: https://border.bot/countries/united-states/hs-codes/8402120000
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 84](https://border.bot/countries/united-states/hs-codes/84) / [8402.12](https://border.bot/countries/united-states/hs-codes/840212) / [8402.12.00.00](https://border.bot/countries/united-states/hs-codes/8402120000)

## Key facts

- Tariff line: 8402.12.00.00
- Covers: Steam or other vapor generating boilers, watertube boilers with a steam production not exceeding 45 t per hour
- Duty (MFN): 4.3%
- Preferential rates: From free (17 programmes or origins)
- Additional duties: None recorded
- Restrictions: None recorded
- Tariff: [United States](https://border.bot/countries/united-states)
- HS subheading: [8402.12](https://border.bot/hs-codes/840212)

## What this line covers

In the United States tariff, line 8402.12.00.00 covers steam or other vapor generating boilers, watertube boilers with a steam production not exceeding 45 t per hour.

Its legal text is “Watertube boilers with a steam production not exceeding 45 t per hour”, read under “Steam or other vapor generating boilers”.

## How it is structured

It falls under HS subheading 8402.12 in heading 84.02 (chapter 84). The first six digits are the Harmonized System code; the 4 digits after them are added by the United States tariff.

- Chapter 84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof
- Heading 84.02: 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
- Subheading 8402.12: Steam or other vapor generating boilers
- Line 8402.12.00.00: Watertube boilers with a steam production not exceeding 45 t per hour

## Duty

The general (MFN) duty rate is 4.3%.

Duty-free entry applies to goods that qualify under 16 programmes, and to goods from a group of origins (origin group A*).

- Free: a group of origins (origin group A*) (A*)
- Free: United States-Australia Free Trade Agreement (AU)
- Free: United States-Bahrain Free Trade Agreement Implementation Act (BH)
- Free: United States-Chile Free Trade Agreement (CL)
- Free: United States-Colombia Trade Promotion Agreement Implementation Act (CO)
- Free: African Growth and Opportunity Act (D)
- Free: Caribbean Basin Economic Recovery Act (E)
- Free: United States-Israel Free Trade Area (IL)
- Free: United States-Jordan Free Trade Area Implementation Act (JO)
- Free: United States-Korea Free Trade Agreement Implementation Act (KR)
- Free: United States-Morocco Free Trade Agreement Implementation Act (MA)
- Free: United States-Oman Free Trade Agreement Implementation Act (OM)
- Free: Dominican Republic-Central America-United States Free Trade Agreement (P)
- Free: United States-Panama Trade Promotion Agreement Implementation Act (PA)
- Free: United States-Peru Trade Promotion Agreement Implementation Act (PE)
- Free: United States-Mexico-Canada Agreement (S)
- Free: United States-Singapore Free Trade Agreement (SG)

## In other countries

No other national tariff on border.bot has live lines under 8402.12 yet.

- [The Harmonized System text for 8402.12](https://border.bot/hs-codes/840212)

- Previous line: [8402.11.00.00](https://border.bot/countries/united-states/hs-codes/8402110000) Watertube boilers with a steam production exceeding 45 t per hour
- Next line: [8402.19.00.00](https://border.bot/countries/united-states/hs-codes/8402190000) Other vapor generating boilers, including hybrid boilers

## Frequently asked questions

### What does tariff line 8402.12.00.00 cover in the United States tariff?

In the United States tariff, line 8402.12.00.00 covers steam or other vapor generating boilers, watertube boilers with a steam production not exceeding 45 t per hour.

### What is the general (MFN) duty on 8402.12.00.00 in the United States?

The general (MFN) duty rate is 4.3%.

### Which preferential rates apply to 8402.12.00.00?

Duty-free entry applies to goods that qualify under 16 programmes: the United States-Australia Free Trade Agreement, the United States-Bahrain Free Trade Agreement Implementation Act, the United States-Chile Free Trade Agreement, the United States-Colombia Trade Promotion Agreement Implementation Act, African Growth and Opportunity Act, Caribbean Basin Economic Recovery Act, the United States-Israel Free Trade Area, the United States-Jordan Free Trade Area Implementation Act, the United States-Korea Free Trade Agreement Implementation Act, the United States-Morocco Free Trade Agreement Implementation Act, the United States-Oman Free Trade Agreement Implementation Act, the Dominican Republic-Central America-United States Free Trade Agreement, the United States-Panama Trade Promotion Agreement Implementation Act, the United States-Peru Trade Promotion Agreement Implementation Act, the United States-Mexico-Canada Agreement and the United States-Singapore Free Trade Agreement, and to goods from a group of origins (origin group A*).

## Sources and updates

The tariff lines for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The duty rates for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The trade programmes for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

This page was last updated on 9 October 2026.

Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling.

Official source files:

- https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false

Machine-readable: https://border.bot/countries/united-states/hs-codes/8402120000.json