HTS 8402 — Steam or vapor generating boilers Tariff Rate (2026)

Under HTS 8402, steam or vapor generating boilers enter the United States with duty-free as the base MFN rate. Steam or other vapor generating boilers. Used in power generation and industrial processes. On top of the MFN rate, most non-EU imports under this heading carry the Section 301 forced-labor tariff — a two-tier 10%/12.5% duty that replaced the flat 10% Section 122 rate on July 24, 2026. EU-origin goods instead fall under the EU-US trade deal's 15% all-inclusive ceiling (effective July 1, 2026), where nothing stacks and goods with an MFN rate of 15% or more pay MFN only. Chinese-origin goods add a Section 301 China tariff of 25% on top. Worked example: a $10,000 shipment under HTS 8402 owes about $0 in MFN duty (0%); adding the 10% base forced-labor surcharge brings it to roughly $1,000 from a standard-tier origin, or about $1,250 from a 12.5%-tier origin such as China (before that origin's Section 301 China tariff). Check your exact figure with the tariff calculator. The top countries of origin for HTS 8402 imports include CN, MX, KR, JP, DE. Effective duty varies by source country based on trade agreements (USMCA, KORUS) and tariff programs — see the per-country tariff rates by country for how CN compares.