Sourcing thermostats and controllers from China

Duty by type

Read from the UK Trade Tariff on 25 September 2026, electronic and other thermostats, manostats, and hydraulic or pneumatic regulating instruments carried 0% duty on goods from China. Other automatic regulating or controlling instruments and parts of the heading carried 2%. None had an anti-dumping measure. Under 9032 89 00, electronic power steering controllers, digital valve controllers for liquids and gases, and listed gas flow control panels have a 0% suspension to the end of 2028. For humidity control equipment, see our automatic humidity controller sourcing guide. For voltage regulation equipment, see our automatic voltage regulator sourcing guide.

A controller built into a boiler, an oven or a machine is classified with that product, not here; confirm the commodity code for what you actually import.

Smart thermostats and security

A thermostat that connects to Wi-Fi, a hub or an app is a connectable product. Schedule 3 of the PSTI security regulations excepts desktops, laptops and non-cellular tablets, not heating controls, so the rules on default passwords, a vulnerability reporting route and a published update period apply; see the PSTI guide.

Wireless models are also radio equipment. Ask who runs the cloud service and app, and what happens to the product if that service stops.

Electrical safety and voltage

The Electrical Equipment (Safety) Regulations 2016 cover equipment rated between 50 and 1,000 volts AC or 75 and 1,500 volts DC. A mains-wired thermostat or panel controller is inside that range; a battery room thermostat is not, but it still has to be safe under general product safety law. Both need UKCA or CE evidence for the rules that apply, and electrical controls bring WEEE obligations.

For industrial PID controllers, check the sensor inputs, relay ratings and accuracy against your application, and ask for the test report behind the rating. For sourcing electrical test instruments, see our oscilloscopes and multimeters guide. For earthing test instruments, see sourcing earth resistance testers. For liquid-level sensing applications, see our liquid level transmitter sourcing guide. For power quality measurement, see our power quality analyser sourcing guide. For conductivity control applications, see our conductivity controller sourcing guide. For liquid-level control applications, see our liquid level controller sourcing guide. For weighing applications, see our strain-gauge load cell sourcing guide. For pH control applications, see our automatic pH controller sourcing guide.

Worked duty example

For a made-up shipment of 10,000 smart room thermostats under 9032 10 20 90, add the £3,000 of freight and insurance to the £120,000 free-on-board price and customs sees £123,000. Duty on electronic thermostats is zero, leaving import VAT of £24,600, 20% of the customs value. For a VAT-registered buyer that is a cash-flow cost rather than a lasting one. The duty and VAT guide walks through the calculation.

Inspection checklist

Accuracy against the declared rating: BS EN 60730-2-9 sets the particular requirements for temperature sensing controls. Test samples against a calibrated reference thermometer at several set points, record the switching differential, and reject units that read outside the accuracy stated on the datasheet the factory quoted.

Switching and wiring: BS EN 60730-1 covers the general requirements for automatic electrical controls, including endurance cycling. Ask for the test report for the relay at its rated load, check the terminal markings and ratings on the label match the report, and check wiring terminals for loose screws and the enclosure for cracks on production pieces.

Connected models: ETSI EN 303 645 is the consumer IoT security baseline the PSTI rules draw on, and EN 300 328 covers 2.4 GHz radios such as Wi-Fi. Check that each unit has a unique password or forces one to be set, that the firmware version matches the approved sample, and that the vulnerability reporting route and support period appear in the documentation.

What goes wrong

Thermostats fail on accuracy, switching and security. Temperature sensors read a degree or two off so rooms overheat or stay cold, relays weld or chatter after a season of cycling, and claimed compatibility with UK boilers, OpenTherm or heat pumps does not work in practice. Connected models ship with shared default passwords or no security update policy, apps fail to pair, and battery units drain within weeks.

Check sensing accuracy against a calibrated reference at several temperatures, run relay endurance cycles at the rated load, test samples on the boilers and heat pumps customers use, check that networked units force a unique password and that a PSTI statement of compliance and vulnerability reporting route exist, test pairing and firmware updates, and measure battery life.

Samples and inspection

Test samples on the boiler, heat pump or process they will control, including switching accuracy and behaviour after a power cut. At inspection, check wiring terminals, labels and firmware version.

Cambridge China Bridge sources thermostats, temperature and pressure controllers, with PSTI, radio and electrical safety evidence settled before the order. See how our sourcing service works.