A thermal actuator is an electrically operated valve actuator used for zone control in underfloor heating, radiant cooling, and hydronic HVAC systems. When energized by a thermostat or controller, a PTC heating element warms an internal wax charge that expands and drives a piston, opening or closing the manifold valve. When power is removed, the wax cools, contracts, and a return spring resets the valve. The result is quiet, gradual valve movement with no solenoid noise or hydraulic shock.

Legom is a manufacturer. Our thermal actuators are produced at our own facility in Jiaxing, Zhejiang, China, with in-house injection molding, sub-assembly, wiring, and end-of-line endurance testing. We do not source finished actuators from third parties and resell them. Factory visits are welcome by appointment for clients who wish to audit the production process directly.

A Normally Closed (NC) actuator keeps the valve closed when no power is supplied and opens it when energized by a thermostat signal. A Normally Open (NO) actuator does the opposite: it holds the valve open at rest and closes it when energized. NC is the standard choice for underfloor heating zone control, because it stops water flow automatically during a power outage. NO configurations are used where maintaining flow by default is the safer operating condition.

Select the voltage that matches your room thermostat or heating controller output. Most European residential systems use 230V actuators wired directly to the thermostat. Systems using a central heating controller or smart-home platform often operate at 24V. The 12V variant suits low-voltage DC control systems. If unsure, check the output voltage specification of your thermostat or controller before ordering.

Legom actuators use M30x1.5mm and M28x1.5mm adapter threads, the two most common standards across major manifold manufacturers. Confirm the thread size on your manifold valve head before ordering. If your manifold uses a different thread, contact the Legom team to discuss adapter options or a custom adapter as part of an OEM project.

Standard models complete their opening or closing cycle in 3 to 5 minutes. This gradual actuation protects the valve seat and reduces hydraulic shock compared with fast-acting solenoid valves. The 920062PL is available with a faster 60 to 90 second actuation option where quicker response is required.

Legom thermal actuators are CE and RoHS certified and built to comply with the EN 60730 standard for automatic electrical controls. Protection grades are IP41 or IP54 depending on the model, suiting installation in manifold boxes and enclosed utility spaces. Compliance documents are available on request for procurement and project submission.

Yes. The 920071PL and 920075PL are smart thermal actuators that connect through WiFi and ZigBee on the Tuya platform, enabling app-based control and integration with voice assistants for connected-home floor heating. The 920075PL is also offered in 8 housing colours. For wired smart systems, the 24V and 0 to 10V modulating models integrate directly with building management systems.

Legom thermal actuators carry a standard 12-month warranty from the date of shipment against manufacturing defects in materials and workmanship. Units that fail to perform to specified force or stroke under normal operating conditions within the warranty period will be replaced. Warranty claims must be accompanied by a sample return for inspection. Extended warranty terms can be discussed for long-term OEM supply agreements.

Legom ships worldwide from Jiaxing, Zhejiang, China via sea freight, air freight, or express courier. We support all major international shipping terms including EXW, FOB Ningbo, CIF, and DDP depending on client preference. Full export documentation, including commercial invoice, packing list, and certificate of origin, is provided with every shipment.

Yes. Legom offers full OEM and ODM customization including voltage rating, control direction (NC or NO), control signal (on/off, 0 to 10V, or smart Tuya), adapter thread size, cable length, force output, and housing colour. All projects are handled under strict NDA. Contact the engineering team with your voltage, control direction, adapter thread, and required force to begin.

An on/off actuator has two states: fully open when energized and fully closed at rest (or the reverse for NO). A 0 to 10V modulating actuator, such as the 920080PL, positions the valve proportionally across its travel in response to a varying control voltage, allowing finer flow regulation and supporting energy-saving, comfort, heating, and off modes. Modulating units suit advanced controllers and building management systems that demand proportional rather than simple on/off control.