Product classification
HS code for Economizers: 8404.10
Boilers, auxiliary plant, for use with boilers of heading no. 8402 or 8403 (e.g. economisers, super-heaters, soot removers, gas recoverers).
Classification of economizers under HS 8404.10
Economizers are classified under HS code 8404.10 as auxiliary plants for use with boilers of heading 84.02 or 84.03. These devices are essentially heat exchangers that capture waste heat from boiler exhaust gases to preheat the feedwater entering the boiler, thereby increasing the overall thermal efficiency of the system. The classification is strictly tied to their role as an auxiliary component to a steam or central heating boiler system. To be classified under 8404.10, the economizer must be designed to work in conjunction with a boiler to improve its performance or operation. If the device is used for general heat exchange purposes unrelated to a boiler system, it may fall under a different heading. The technical construction usually involves a series of tubes through which water flows, while hot flue gases pass over the exterior of the tubes.
- Covers
- Feedwater economizers for steam boilers
- Flue gas heat recovery units for boilers
- Auxiliary heat exchangers for central heating boilers
- High-pressure economizers
- Condensing economizers
- Cast iron or steel tube economizers
- Also under 8404.10
- GE Power economizers
- Siemens Energy superheaters
- Clyde Bergemann soot blowers
- Babcock & Wilcox air preheaters
Codes often confused with 8404.10
Common mistake. Economizers are frequently misclassified under HS code 8419.50, which covers general-purpose heat exchangers. The distinction is that 8404.10 is specific to boiler auxiliary plants. If the heat exchanger is not part of a boiler system (e.g., used in a chemical process), 8419.50 is correct. They are also sometimes confused with the boilers themselves (8402), but as auxiliary equipment, they must be separated unless they are imported as an integral, non-detachable part of the boiler unit.
Top exporters and importers of HS 840410 (the code used for economizers), 2025
In 2025, the largest exporter of HS 840410 (the code used for economizers) in UN Comtrade data was China, with 36% of world exports; the largest importer in UN Comtrade data was the United States, with 9.9% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Figures cover everything classified under HS 840410, not only economizers.
Top exporters 2025 · share of world exports
- 1 China $194M 36% of world exports
- 2 Italy $47M 8.7% of world exports
- 3 Germany $45M 8.3% of world exports
World total: $540M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United States $49M 9.9% of world imports
- 2 France $33M 6.7% of world imports
- 3 United Kingdom $29M 5.9% of world imports
World total: $495M Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM codes for economizers
Brazil splits HS 8404.10 into 2 NCM codes. Pick the one that matches your product:
- 8404.10.10Auxiliary plant, steam/super-heated water boilers
- 8404.10.20Auxiliary plant for central heating boilers
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about economizers
What is the HS code for Economizers?
The HS code for Economizers is 840410 (Boilers; auxiliary plant, for use with boilers of heading no. 8402 or 8403 (e.g. economisers, super-heaters, soot removers, gas recoverers)). The HS code for economizers used as auxiliary plant for boilers is 8404.10. This applies to both steam and central heating boiler applications.
How do I classify Economizers for customs?
Economizers is classified under HS code 840410 — Boilers; auxiliary plant, for use with boilers of heading no. 8402 or 8403 (e.g. economisers, super-heaters, soot removers, gas recoverers). This is a 6-digit subheading level code.
Can an economizer be classified under 8419?
An economizer is only classified under 8419.50 if it is a general heat exchanger not intended for use as an auxiliary plant for a boiler of heading 84.02 or 84.03. If it is for a boiler, 8404.10 takes precedence.
Which countries are the top exporters of economizers (HS 840410)?
In 2025, the top exporters of HS 840410 (the code used for economizers) in UN Comtrade data were China ($194M, 36% of world exports), Italy ($47M) and Germany ($45M). World exports came to about $540M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of economizers (HS 840410)?
In 2025, the top importers of HS 840410 (the code used for economizers) in UN Comtrade data were the United States ($49M, 9.9% of world imports), France ($33M) and the United Kingdom ($29M). World imports came to about $495M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Is the HS code for Economizers the same in all countries?
The base HS code 840410 for Economizers is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.
What is the NCM code for economizers in Brazil?
Brazil splits HS 840410 into 2 NCM codes, so the right one for economizers depends on the product's details: 8404.10.10 (Auxiliary plant, steam/super-heated water boilers), 8404.10.20 (Auxiliary plant for central heating boilers).