Sourcing replacement boiler casings from China
Replacement central-heating boiler casings from China carry 0% UK duty under the parts lines of heading 8403, with no listed trade remedies. Only sell casings once compliance with applicable product safety rules is demonstrated; match the exact boiler model and casing function. Cambridge China Bridge sources replacement central-heating boiler casings.
0% duty on replacement boiler casing parts
Heading 8403 covers central-heating boilers other than those of heading 8402, and their parts. This guide covers replacement casings and casing panels supplied separately. The table distinguishes complete casings from panels under the same parts codes; these are product variants, rather than additional tariff subdivisions.
Read from the UK Trade Tariff on 1 October 2026, both parts lines carried 0% duty for goods from China. The supplied tariff record lists no anti-dumping or countervailing duties, suspensions, steel measures or attached import controls. Complete boilers carry 2%; that rate does not describe separately supplied casing parts.
Confirm the material, intended boiler models and whether the shipment contains bare casings or assembled equipment before choosing the commodity code. For related parts within this heading, see replacement boiler heat exchangers.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Replacement cast-iron central-heating boiler casings | 8403 90 10 00 | 0% | None |
| Replacement central-heating boiler casings of other materials | 8403 90 90 00 | 0% | None |
Specify the boiler model and casing function
Give the factory the boiler make, model, variant and original part reference, supported by drawings and an approved sample. Specify material, thickness, folds, mounting holes, clips, screws, ventilation openings and finish. State whether the casing is an outer cover or forms part of a sealed enclosure, and identify any gasket supplied with it.
Agree sealing-face geometry, gasket location, access-panel alignment and clearance around controls and pipework. Ask for trial-fit evidence against the intended model. Only sell products once compliance with applicable product safety regulations has been demonstrated. Ask a compliance reviewer to assess the supplied casing or assembly, rather than accepting paperwork for an unrelated complete boiler.
Worked duty example
Illustrative example, not a quote: Illustrative order: 300 replacement steel central-heating boiler casings under 8403 90 90 00, invoiced at £28,000 free on board, with £4,000 of freight and insurance to the UK. The customs value is £32,000. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £32,000, so it is £6,400. 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 fit: match part references and drawings; trial-fit sampled casings on the intended model or an agreed fixture, checking holes, clips, access panels and control openings.
Sealing surfaces: check flatness, gasket seating and closure alignment against the approved sample; reject damaged seals and distorted mating edges.
Material and finish: check the agreed material and thickness, coating coverage, corrosion, sharp edges, casting cracks and damaged fixing points.
Packing and arrival: check protection around corners and projecting clips; inspect unloaded parts for dents, scratches and moisture damage before accepting them into stock.
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What goes wrong
Similar-looking boiler variants can have different fixing positions, control openings or sealing arrangements. A casing may fit around the appliance yet fail to close correctly. Coating build-up around clips, bent panels and compressed gaskets can also spoil the approved fit.
Approve the casing on the intended model before production and agree how the factory records design changes. Keep warehouse inspection to unloaded parts. Arrange work on a domestic gas boiler through a Gas Safe registered engineer and ask them to follow the appliance manufacturer's servicing instructions.
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.
Frequently asked questions
What is the UK import duty on replacement boiler casings from China?
The heading 8403 parts lines carry 0% duty: 8403 90 10 00 for cast iron and 8403 90 90 00 for other materials. The supplied tariff record lists no anti-dumping or countervailing duty.
Can a factory copy a casing from photographs?
Use photographs to explain the part, then provide drawings and an approved sample. Check fixing positions, sealing faces and trial fit against the exact boiler variant before production.
Which documents should I request for a replacement casing?
Request the part drawing, material and coating specification, compatibility list and trial-fit record. Ask a compliance reviewer which safety evidence applies to the casing or assembly being supplied.
Who should fit a replacement casing on a domestic gas boiler?
Arrange fitting through a Gas Safe registered engineer, using the boiler manufacturer's servicing instructions. Keep warehouse checks to unloaded parts and agreed inspection fixtures.