HTS tariff line · chapter 84
8403.10.00
Central heating boilers (other than those of heading 8402) and parts thereof: boilers
Analysis
HTS 8403.10.00 covers central heating boilers (other than those of heading 8402) and parts thereof: boilers under heading 8403 (central heating boilers (other than those of heading 8402) and parts thereof).
Goods from countries without normal trade relations pay the column 2 rate of 45% instead of nothing, so origin decides between free entry and a 45% duty.
The normal trade relations rate here is zero, shared by about 61% of the 823 tariff lines in chapter 84, a useful check when a neighbouring dutiable line is a candidate. Chapter 99 measures such as Section 301 or 232 can still apply on top, depending on where the goods come from.
The other line in the same group is 8403.90.00 (central heating boilers (other than those of heading 8402)…, duty-free).
Census statistics map these goods to NAICS 333414 (Heating Equipment (except Warm Air Furnaces) Manufacturing), an industry of 354 US establishments employing 17,079 people. That concordance is how imports of this line are compared with US output.
Every edition we compared, from Jan 2023 to Oct 2026 (Rev. 22), shows the same general rate of Free.
Neighbouring lines
| Line | Description | General rate |
|---|---|---|
| 8403.90.00 | Central heating boilers (other than those of heading 8402) and parts thereof: parts | Free |