Boiler economisers and auxiliaries from China

0% duty

Read from the UK Trade Tariff on 27 September 2026, auxiliary plant for use with boilers of heading 8402 or 8403 (for example, economisers, superheaters, soot removers, gas recoverers), condensers for steam or other vapour power units, and parts, heading 8404, carried 0% on goods from China on every line, with no anti-dumping measure.

Steam boilers themselves are covered in our steam boilers guide and central heating boilers in our central heating boilers guide; heat exchangers for other uses are under heading 8419, so confirm the commodity code.

Pressure equipment and standards

Economisers, superheaters and condensers under pressure fall under the Pressure Equipment (Safety) Regulations 2016 according to their pressure, volume and fluid, and need conformity assessment, UKCA marking where required, a declaration of conformity and pressure test records. Water-tube boilers and their auxiliary installations are designed to the BS EN 12952 series and shell boilers to BS EN 12953.

Specifying auxiliary plant

Specify duty (flue gas and water flows and temperatures), design pressure and temperature, tube material and fin type, casing and insulation, connections and bypass, soot-blowing access, and the design code, inspection and test plan.

Worked duty example

An invented example rather than a quote: two boiler flue gas economisers, commodity code 8404 10 00 00, bought for £64,000 free on board, with £5,000 of freight and insurance, so £69,000 is the value customs works from. No duty is due on economisers; import VAT at 20% of £69,000 is £13,800. If you are VAT-registered, that VAT is normally reclaimable. See calculating UK import duty and VAT for the method.

Inspection checklist

Welding and NDT: check welder qualifications, weld maps and radiography or other NDT records against the inspection plan.

Pressure test: witness the hydrostatic test at the specified pressure and check the records.

Documents and packing: check material certificates, the declaration of conformity and nameplate, and that tube banks are braced and connections capped for transit.

What goes wrong

Auxiliary plant orders fail on welds, materials and fit. Tube welds fail NDT, tube material is not the grade on the certificate, flange positions do not match the boiler, fins corrode in acidic flue gas, and pressure documentation is incomplete.

Witness NDT and pressure tests, check materials, and confirm connection drawings. See our quality inspection guide.

Cambridge China Bridge sources boiler economisers and auxiliary plant for UK boiler houses and contractors, checking the maker's pressure equipment approvals first. See factory verification.