HS code · 6-digit subheading
HS Code 8403.90 – Boilers; parts of central heating boilers (excluding those of heading no. 8402)
HS code 8403.90 is the 6-digit subheading for boilers, parts of central heating boilers (excluding those of heading no. 8402). It is used for heat exchangers for central heating boilers, boiler burners (gas/oil), control boards for boilers, circulation pumps for heating systems and expansion vessels.
What HS 8403.90 covers
This category covers all parts specifically designed for central heating boilers classified under heading 840310. This trade is essential for the manufacturing, installation, maintenance, and repair of heating systems in residential, commercial, and institutional buildings globally. It includes a wide array of components, from heat exchangers and burners to control boards, circulation pumps, and safety devices. The market for these parts is driven by the demand for new boiler installations, routine servicing, and upgrades to improve efficiency or comply with evolving energy regulations. Importers are typically boiler manufacturers, HVAC service companies, wholesalers, and retailers. Exporters are often specialized component manufacturers or the boiler OEMs themselves, providing a robust supply chain for the heating industry.
- Covers
- Heat exchangers for central heating boilers
- Boiler burners (gas/oil)
- Control boards for boilers
- Circulation pumps for heating systems
- Expansion vessels
- Pressure relief valves for heating boilers
- Boiler casings
- Igniters
- Thermostats for boilers
- Examples
- Grundfos circulation pumps
- Honeywell boiler controls
- Siemens boiler components
- Worcester Bosch spare parts
Codes often confused with 8403.90
Common mistake. Must be differentiated from parts of steam or vapor generating boilers (840290) and general heating appliance parts (841990), as these parts are specific to central heating boilers of heading 8403.
Top exporters and importers of HS code 840390, 2025
In 2025, the largest exporter of HS code 840390 in UN Comtrade data was Slovakia, with 17% of world exports; the largest importer in UN Comtrade data was Germany, with 14% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Top exporters 2025 · share of world exports
- 1 Slovakia $347M 17% of world exports
- 2 France $297M 14% of world exports
- 3 Germany $246M 12% of world exports
World total: $2.1B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Germany $321M 14% of world imports
- 2 United Kingdom $239M 10% of world imports
- 3 France $231M 10% of world imports
World total: $2.3B 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 code for 8403.90
Brazil does not split HS 8403.90: its NCM code is 8403.90.00.
All Brazil NCM codes in heading 84.03 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 8403.90
What is HS code 840390?
HS code 840390 is a 6-digit subheading in the Harmonized System that covers: Boilers; parts of central heating boilers (excluding those of heading no. 8402). This category covers all parts specifically designed for central heating boilers classified under heading 840310. This trade is essential for the manufacturing, installation, maintenance, and repair of heating systems in residential, commercial, and institutional buildings globally. It includes a wide array of components, from heat exchangers and burners to control boards, circulation pumps, and safety devices. The market for these parts is driven by the demand for new boiler installations, routine servicing, and upgrades to improve efficiency or comply with evolving energy regulations. Importers are typically boiler manufacturers, HVAC service companies, wholesalers, and retailers. Exporters are often specialized component manufacturers or the boiler OEMs themselves, providing a robust supply chain for the heating industry.
What products fall under HS code 840390?
Heat exchangers for central heating boilers, boiler burners (gas/oil), control boards for boilers, circulation pumps for heating systems, expansion vessels, pressure relief valves for heating boilers, boiler casings, igniters, thermostats for boilers
What are common misclassifications for HS code 840390?
Must be differentiated from parts of steam or vapor generating boilers (840290) and general heating appliance parts (841990), as these parts are specific to central heating boilers of heading 8403.
Which countries are the top exporters of goods under HS code 840390?
In 2025, the top exporters of HS code 840390 in UN Comtrade data were Slovakia ($347M, 17% of world exports), France ($297M) and Germany ($246M). World exports came to about $2.1B, 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 goods under HS code 840390?
In 2025, the top importers of HS code 840390 in UN Comtrade data were Germany ($321M, 14% of world imports), the United Kingdom ($239M) and France ($231M). World imports came to about $2.3B, 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.
How is HS code 840390 structured?
HS code 840390 is a 6-digit subheading under the Harmonized System. The first 2 digits (84) identify the chapter, digits 3-4 (03) identify the heading, and digits 5-6 (90) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 840390?
In Brazil, HS code 840390 is NCM 8403.90.00. The last two digits are 00 because Brazil does not split this HS code further.