# United States tariff lines under HS 8402.12

> The United States tariff splits HS 8402.12 (steam or other vapour generating boilers: Watertube boilers with a steam production not exceeding 45t per hour) into 1 national line: 8402.12.00.00 (watertube boilers with a steam production not exceeding 45 t per hour). The general (MFN) duty is 4.3% on this line.

Source: https://border.bot/countries/united-states/hs-codes/840212
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)

## Key facts

- HS subheading: [8402.12](https://border.bot/hs-codes/840212)
- Duty (MFN): 4.3%
- National lines: 1
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof

## United States lines under 8402.12

The United States tariff splits HS 8402.12 (steam or other vapour generating boilers: Watertube boilers with a steam production not exceeding 45t per hour) into 1 national line: 8402.12.00.00 (watertube boilers with a steam production not exceeding 45 t per hour).

The general (MFN) duty is 4.3% on this line.

- [8402.12.00.00](https://border.bot/countries/united-states/hs-codes/8402120000) Steam or other vapor generating boilers, Watertube boilers with a steam production not exceeding 45 t per hour. Duty (MFN): 4.3%

## 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 subheading: [8402.11](https://border.bot/countries/united-states/hs-codes/840211) 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
- Next subheading: [8402.19](https://border.bot/countries/united-states/hs-codes/840219) 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

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 8402.12?

The United States tariff splits HS 8402.12 (steam or other vapour generating boilers: Watertube boilers with a steam production not exceeding 45t per hour) into 1 national line: 8402.12.00.00 (watertube boilers with a steam production not exceeding 45 t per hour).

### What is the duty on HS 8402.12 in the United States?

The general (MFN) duty is 4.3% on this line.

## 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/840212.json