Sourcing biomass boiler grates from China
Replacement biomass boiler grates from China carry 0% UK duty under the cast-iron and other boiler-parts lines of heading 8403. Articles supplied for workplace use must be safe, so far as reasonably practicable, and accompanied by adequate safe-use information. Cambridge China Bridge sources replacement biomass boiler grates.
0% duty on replacement boiler grates
Read from the UK Trade Tariff on 1 October 2026, heading 8403 covers central heating boilers and their parts. Replacement grates identifiable as parts of these boilers fall within the parts lines: 8403 90 10 00 for cast iron and 8403 90 90 00 for other materials. The table shows different grate forms sharing these codes.
Both parts lines carry 0% duty for goods from China. The supplied tariff record lists no anti-dumping or countervailing duty, suspension or attached import control for either line. The complete boilers in this heading carry 2%; that rate does not describe separately imported replacement grates classified as parts.
Give your customs broker the material specification, drawing and intended boiler application to confirm the commodity code. For complete heating equipment, see wood pellet central heating boilers.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Cast-iron replacement biomass boiler grate bars | 8403 90 10 00 | 0% | None |
| Cast-steel replacement biomass boiler grate bars | 8403 90 90 00 | 0% | None |
Specify the alloy, air slots and grate fit
Identify the boiler maker, model, original part reference and whether the grate is fixed or moving. Provide a controlled drawing covering support faces, engagement features, air-slot geometry, clearances and machining. Describe the fuel and operating conditions, and agree the material grade and heat treatment with the boiler maintainer. A worn sample alone is a poor dimensional reference.
Ask for material analysis linked to the production batch, an inspection report against the drawing and a sample fit check before bulk production. Agree how substitutions will be approved. For workplace use, supplied articles must be safe, so far as reasonably practicable, and accompanied by adequate information for safe use. Include installation and maintenance information relevant to the replacement part.
Worked duty example
Illustrative example, not a quote: Illustrative order of 40 cast-iron replacement grate bars under 8403 90 10 00, invoiced at £8,000 free on board, with £1,200 of freight and insurance to the UK. The customs value is £9,200. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £9,200, so it is £1,840. 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
Material: match batch identification to the agreed material analysis and heat-treatment records; investigate certificates that cannot be traced to the supplied castings.
Fit: measure support faces, locating features, air slots and flatness against the drawing; trial-fit mating segments and moving interfaces on a suitable fixture.
Casting condition: inspect for cracks, broken edges, distortion and blocked slots; agree any additional examination with the maintainer before ordering.
Arrival and identification: check quantities, part references, batch labels and transit damage; separate damaged castings and retain the inspection record. Plan quality inspection before dispatch as well.
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What goes wrong
A replacement can look correct yet bind when hot, leave uneven air gaps or fail to engage with adjacent segments. Copying an eroded sample can reproduce wear as a manufacturing dimension. An unapproved alloy substitution can change resistance to heat and wear. Resolve these risks through drawings, traceable material evidence and a fit trial.
For workplace installations, HSE says maintenance should be carried out only by competent people with sufficient information, instruction and training. It also states that plant and equipment must be made safe before maintenance starts. Give the maintainer the agreed part specification and installation information before arranging replacement.
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 biomass boiler grates from China?
Both relevant parts lines carry 0%: 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 Chinese foundry copy my worn grate?
Use the sample alongside a controlled drawing and the original part reference. Worn support faces and enlarged air slots should not become the dimensions of the new casting.
What material evidence should I ask for?
Ask for the agreed material grade, batch-linked chemical analysis and relevant heat-treatment records. Check that the documents identify the castings supplied, and approve substitutions before production.
Who should fit replacement grates at a workplace?
HSE says maintenance should be carried out by competent people with sufficient information, instruction and training. Plant and equipment must be made safe before maintenance starts.