What is the U.S. tariff rate on heat exchange and process heating?

USITC calculated duties imply an effective rate of 11.17% in Jun 2026 (calculated duties ÷ covered customs value, USITC DataWeb). The parseable Column 1 General line-rate range is 0%–4.2%; individual lines are called “Free” only when the official General field is literally Free, and product, origin, preference and tariff mix can contribute to the observed-rate difference.

What are the statutory MFN line rates for heat exchange and process heating?

The parseable Column 1 General line-rate range is 0%–4.2% across the family's 26 eight-digit HTS lines in the 2026 Harmonized Tariff Schedule (headings 8419). “Free” means the official General field is literally Free for a line; it does not determine final entry liability.

Which countries supply the most heat exchange and process heating to the U.S.?

Top retained sources in 2025: Mexico ($1.6B at 3.25%), Taiwan ($1.2B at 10.97%), China ($1.2B at 43.22%). Mexico holds 15.9% of total family import customs value. Retained sources cover 79.7%; their HHI is 810, a lower bound whose floor falls in the diversified range without classifying the omitted tail.

How much heat exchange and process heating does the U.S. import?

$9.8B of customs value in 2025, with $1.2B in USITC Calculated Duties — an effective calculated-duty rate of 12.24%.

Is the U.S. a net importer of heat exchange and process heating?

Yes — a net importer in 2025: $9.8B imported vs $2.5B exported (exports are 26% of imports).

Tariff monitor · Machinery & Equipment

Heat Exchange and Process Heating: Statutory & Effective Tariff Rates

USITC Column 1 General rates for 26 heat exchange and process heating HTS lines (parseable range 0%–4.2%). Effective rate Jun 2026: 11.17%; monthly history since 202

The short answer

The observed effective calculated-duty rate on U.S. imports of heat exchange and process heating was 11.17% in Jun 2026, down from 11.39% a year earlier — USITC Calculated Duties divided by covered customs value. The Column 1 General line-rate range is 0%–4.2% across 26 HTS lines in the 2026 schedule; individual lines are called “Free” only when the official General field is literally Free, which still does not determine a shipment’s final duty. Mexico is the largest source, holding 15.9% of 2025 imports.

Statutory rates from the schedule

Heat exchangers, chillers, dryers, and evaporators — moving heat into and out of a process. This family covers HTS heading 8419: 26 eight-digit rate lines with a parseable Column 1 General range of 0%–4.2% in the 2026 schedule. “Free” means the official General field is literally Free for that line; it does not determine final entry liability.

Observed calculated-duty data

Latest month on record (2026-06): 11.17% effective on $1.0B of imports, versus 11.39% in the same month a year earlier. The monthly archive holds 42 observations from 2023-01 through 2026-06.
In 2025, U.S. imports for consumption in this family totaled $9.8B in customs value, with $1.2B in USITC reported calculated duty on $9.8B of covered customs value: an effective calculated-duty rate of 12.24%. The aggregate reflects the recorded entry mix but does not attribute the result to a specific legal provision.
A year earlier the effective calculated-duty rate was 2.79%, so the observed rate rose 9.4 points.
Top source countries in 2025: Mexico ($1.6B at 3.25%), Taiwan ($1.2B at 10.97%), China ($1.2B at 43.22%), Canada ($857.0M at 2.16%), South Korea ($752.4M at 5.81%).
Reported freight and insurance equaled 3.55% of covered customs value in 2025 ($276.7M total); charge coverage was 79.7% of customs value, from USITC DataWeb. It is shown alongside the effective calculated-duty rate and is not part of the customs-value duty base.

Representative rate lines

8419.11.00.00: Instantaneous gas water heaters · MFN Free
8419.12.00.00: Solar water heaters · MFN Free
8419.19.01: Other · MFN Free
8419.20.00: Medical, surgical or laboratory sterilizers · MFN Free
8419.33.10.00: For agricultural products · MFN Free
8419.33.50.00: Other · MFN Free
8419.34.00.00: Other, for agricultural products · MFN Free
8419.35.10.00: For wood · MFN Free

Frequently asked questions

What is the U.S. tariff rate on heat exchange and process heating? USITC calculated duties imply an effective rate of 11.17% in Jun 2026 (calculated duties ÷ covered customs value, USITC DataWeb). The parseable Column 1 General line-rate range is 0%–4.2%; individual lines are called “Free” only when the official General field is literally Free, and product, origin, preference and tariff mix can contribute to the observed-rate difference.
What are the statutory MFN line rates for heat exchange and process heating? The parseable Column 1 General line-rate range is 0%–4.2% across the family's 26 eight-digit HTS lines in the 2026 Harmonized Tariff Schedule (headings 8419). “Free” means the official General field is literally Free for a line; it does not determine final entry liability.
Which countries supply the most heat exchange and process heating to the U.S.? Top retained sources in 2025: Mexico ($1.6B at 3.25%), Taiwan ($1.2B at 10.97%), China ($1.2B at 43.22%). Mexico holds 15.9% of total family import customs value. Retained sources cover 79.7%; their HHI is 810, a lower bound whose floor falls in the diversified range without classifying the omitted tail.
How much heat exchange and process heating does the U.S. import? $9.8B of customs value in 2025, with $1.2B in USITC Calculated Duties — an effective calculated-duty rate of 12.24%.
Is the U.S. a net importer of heat exchange and process heating? Yes — a net importer in 2025: $9.8B imported vs $2.5B exported (exports are 26% of imports).

About this data

Reference statistics derived from USITC published data. Not a customs ruling. MFN-Free and Special-rate fields describe statutory line coverage only; final entry liability requires origin, date, eligibility, exclusions and other transaction facts. Calculated Duties are statistical estimates, not a cash-collections ledger. Confirm classification, origin, program eligibility, and final entry liability with a licensed customs broker.

Last reviewed 2026-08-31.