Sourcing Stirling generating sets from China

Duty on complete Stirling generating sets

Heading 8502 covers electric generating sets and rotary converters. For a complete Stirling-engine generating set, the supplied line to investigate is 8502 39 80 90, other generating sets, other. The table shows buying configurations under that same line, rather than separate tariff bands. For wider heading context, see gas CHP generating sets.

Read from the UK Trade Tariff on 1 October 2026, this line carried 0% duty for goods from China. The supplied record lists no anti-dumping or countervailing duty, suspension or attached import control for it. Import VAT is normally 20%.

Give your customs broker the engine operating description, heat-source arrangement, electrical output and list of equipment supplied together. Ask them to confirm the complete assembly's classification using finding your commodity code. Identify separately supplied engines, heat exchangers and control equipment in the enquiry.

Specify heat input, cooling and net electrical output

State whether the set will use recovered process heat or a dedicated heater. Specify the available heat-source temperature and flow, cooling-water conditions, ambient conditions and intended operating load. Agree net electrical output after the set's own pumps, fans and controls have consumed power. Record useful recovered heat separately from electrical output.

Define the working gas, charging pressure, sealing arrangement, generator, power electronics, output voltage, frequency and operating mode. Agree start-up behaviour, shutdown on loss of cooling and access for servicing. Ask the factory to demonstrate sustained operation under the agreed heat-input and cooling conditions.

For Great Britain, check that the relevant machinery conformity assessment has been completed and the relevant conformity marking is affixed. Request machinery conformity documents and electrical safety evidence for the delivered configuration. Confirm with the relevant authority the responsibilities for compiling the machinery technical file and making it available on request.

The pressure-equipment rules regulate equipment and assemblies with maximum allowable pressure above 0.5 bar. Give your testing and certification adviser the working-gas circuit, pressure and vessel details to assess applicability before approving the design.

Worked duty example

Illustrative example, not a quote: Illustrative order of one compact Stirling-engine generating set for a business heat-recovery trial under 8502 39 80 90, invoiced at £20,000 free on board, with £1,500 of freight and insurance to the UK. The customs value is £21,500. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £21,500, so it is £4,300. 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 engine, generator, controller and heat-exchanger references to the approved drawings, rating plates and conformity documents.

Thermal and electrical performance: record heat-source and cooling conditions alongside sustained net electrical output. Check voltage stability, load response, vibration and signs of overheating.

Sealing and protection: review working-gas leak-test records and inspect coolant joints. Have a competent tester demonstrate agreed cooling-loss shutdown, electrical protection and guarding.

Arrival condition: inspect heater connections, heat exchangers, mounts, wiring and crate damage. Compare the delivered assembly with the approved photographs and inspection brief.

What goes wrong

A demonstration can show useful output with a hotter heat source or colder cooling water than the buyer can provide. Quoted generator output can also exclude the power consumed by auxiliary equipment. Tie acceptance to recorded operating conditions and net output at the agreed delivery point.

Working-gas leakage, coolant leaks, loose mounts and altered control settings can undermine repeatability. A replacement heat exchanger or controller can also make the delivered configuration differ from the tested sample. Agree substitution approval, retain test records and identify seals, service parts and charging arrangements before ordering.

Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For components and parts, see sourcing for manufacturers.