Sourcing water-tube steam boilers from China

Zero duty across both steam-output bands

Heading 8402 includes steam-generating boilers and their parts. Water-tube steam boilers are split by steam production: exceeding 45 tonnes per hour, or not exceeding that output. This guide covers that family; see the wider steam boilers guide for other boiler types.

Read from the UK Trade Tariff on 25 October 2026, both water-tube boiler lines and the parts line carried 0% duty for goods from China. The supplied tariff record lists no anti-dumping or countervailing measures, suspensions or attached import controls for these lines. Tariff clearance does not replace pressure equipment compliance.

Confirm the commodity code using the boiler design and declared steam output. The parts examples share the same tariff line; confirm that separately shipped components qualify as boiler parts rather than assuming every tube, valve or accessory belongs there.

Specify steam output, pressure and the supply boundary

State the required steam output, working pressure, steam condition, fuel and feedwater quality. Agree whether the order includes the burner, feed pumps, water treatment, blowdown equipment and control panel. Obtain drawings showing the drums, headers, tube banks, connections and maintenance access, plus shipping dimensions and lifting arrangements.

Agree the design standard and conformity assessment route before fabrication. Water-tube boilers commonly use the European water-tube boiler design standard identified in our wider guide. Under the Pressure Equipment (Safety) Regulations 2016, the boiler needs the applicable conformity assessment; confirm the applicable UKCA or CE marking and declaration of conformity requirements with the relevant authority. Match the documents to the supplied design and pressure.

Before use, arrange a suitable written scheme of examination and complete the required examination. Confirm with the relevant authority who should draw up or certify the scheme. For combustion installations in England and Wales, check whether medium combustion plant permitting applies, including the relevant exemptions and compliance dates.

Worked duty example

Illustrative example, not a quote: Illustrative order: one water-tube steam boiler with burner and controls under 8402 12 00 00, invoiced at £60,000 free on board, with £5,000 of freight and insurance to the UK. The customs value is £65,000. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £65,000, so it is £13,000. With no duty, the only import tax is the VAT, which a VAT-registered importer can usually reclaim. The import duty and VAT guide explains each step.

Inspection checklist

Identity and documents: match the nameplate, serial number, drawings, pressure rating and conformity declaration to the actual boiler and included assemblies.

Pressure boundary: trace drum, header and tube materials to certificates; review weld inspection records and witness the agreed hydrostatic test before shipment.

Protection and controls: check safety valves, water-level indication, low-water cut-outs and burner interlocks against the approved design; agree functional checks with the commissioning engineer.

Arrival condition: inspect tube banks, headers, insulation, cladding and connections for damage or moisture; compare loose components with the packing list and photograph defects before installation.

What goes wrong

A certificate may cover a different pressure or design, while material records fail to identify the installed tubes or headers. Weld defects and leaking joints can then emerge during testing or firing. Agree document review and witnessed tests before dispatch; factory verification helps establish whether the supplier can make and document the specified boiler.

Unclear supply boundaries leave the buyer without feedwater equipment, compatible controls or commissioning support. Poor transport bracing can damage connections and cladding. Record interfaces, loose-item lists, packing requirements and responsibility for site assembly in the purchase specification.

Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For machinery and equipment, see machinery imports.