Room Thermostat
Manufacturer & Supplier in China
Legom is a factory-direct room thermostat manufacturer and supplier in China, producing CE and RoHS certified smart thermostats for water-based underfloor heating and cooling systems at our own facility in Jiaxing, Zhejiang Province. With in-house PCB assembly, firmware development, burn-in testing, and 100% functional inspection on every unit, Legom supplies OEM underfloor heating system integrators and HVAC distributors in 90+ countries with consistent, independently verified thermostat products for residential, commercial, and hospitality applications.
When you source room thermostats from Legom, you specify CE and RoHS certified devices engineered for direct integration with M30 × 1.5 thermal actuators, hydronic manifolds, and the Legom base station ecosystem — supporting individual zone control, centralized multi-room management, and automatic heating/cooling changeover for heat pump systems.
Quality Meets Reliability
CE Certified
Room Thermostat
Rapid Temperature Responsiveness
Precise Temperature Regulation
Durable Performance
Product Range
Legom manufactures 3 room thermostat models for water-based underfloor heating and radiant cooling systems — each designed for a distinct control interface, feature set, and installation context. All models are CE certified, compatible with NTC sensors and Legom thermal actuators, and available for OEM and ODM customization. The Legom base station is supported across all three models for centralized multi-zone control.
Apus Room Thermostat
The Apus RT-A1 is Legom's premium rotary-knob thermostat — the only model in the range with a tactile knob interface and the highest actuator capacity of up to 5 simultaneous actuators.
| Parameter | Specification |
|---|---|
| Model | Apus RT-A1 |
| Interface | Rotary-push knob with fine ratchet + backlit LCD |
| Operating Voltage | 230VAC, 50/60Hz |
| Max Actuator Capacity | 5 thermal actuators simultaneously |
| Operating Modes | Heating and cooling dual mode |
| Actuator Type | NC and NO supported |
| Advanced Parameters | H1–H4 |
| Housing | 86 × 86 × 31mm; surface mount |
| Colour Options | White, Black |
| Base Station Compatible | Yes |
FC Room Thermostat
The FC FC1D is the only Legom thermostat with an automatic CO changeover terminal — enabling seamless switching between heating and cooling mode via a 230V signal without manual user intervention.
| Parameter | Specification |
|---|---|
| Model | FC FC1D |
| Interface | Button panel; backlit LCD display |
| Operating Voltage | 100–240VAC, 50/60Hz |
| CO Changeover | Auto CO terminal — switches heating/cooling on 230V signal |
| Operating Modes | Heating and cooling dual mode |
| Sensor | NTC; internal and external probe supported |
| Child Lock | Yes — long press Up + Down 5 seconds |
| WiFi Indicator | Yes — dedicated WiFi status display |
| Advanced Parameters | H1–H4, L1, L2 (6 parameters) |
| Housing | 86 × 86 × 13mm; panel mount |
| Colour Options | White, Black |
| Base Station Compatible | Yes |
Volcano Thermostat
The Volcano RB-2305HT is Legom's widest-voltage thermostat — operating on 100–240VAC — with the highest temperature accuracy at ±1°C and the broadest colour range across three variants.
| Parameter | Specification |
|---|---|
| Model | Volcano RB-2305HT |
| Variants | RT-V1, RT-V2, RT-V3 |
| Interface | Circular display panel; minimal aesthetic |
| Operating Voltage | 100–240VAC, 50/60Hz |
| Temperature Accuracy | ±1°C |
| Sensor | NTC; internal (5–35°C) and external probe (5–60°C) |
| Sensor Modes | Internal only / External only / Both simultaneously |
| Housing | 86mm square; circular display |
| Colour Options | White, Black, Grey |
| Base Station Compatible | Yes |
Model Comparison
All three models support water-based underfloor heating and cooling, NTC sensor, and Legom base station integration. Key differences are summarised below to assist product selection.
| Feature | Apus RT-A1 | FC FC1D | Volcano RB-2305HT |
|---|---|---|---|
| Interface | Rotary-push knob | Button panel | Button / circular display |
| Voltage | 230VAC | 100–240VAC | 100–240VAC |
| Heating + Cooling | Yes | Yes | Yes (with heat pump) |
| Auto CO Changeover | No | Yes | No |
| Max Actuators | 5 | Standard | Standard |
| Child Lock | No | Yes | No |
| WiFi Indicator | No | Yes | No |
| Temperature Accuracy | Standard | Standard | ±1°C |
| Colour Options | White, Black | White, Black | White, Black, Grey |
| Housing Depth | 31mm | 13mm (slimmest) | Standard |
| Advanced Parameters | 4 (H1–H4) | 6 (H1–H4, L1–L2) | Standard |
| Base Station | Yes | Yes | Yes |
How to Select the Right Room Thermostat
All three Legom room thermostats support water-based underfloor heating and the Legom base station. The right model depends on your system's specific control requirements. Confirm these three points before specifying:
What control interface does the end user prefer?
The Apus uses a rotary-push knob. This is more tactile and intuitive for users unfamiliar with digital menus, and it suits wet-hand environments. The FC and Volcano use button panels with LCD displays. These are better suited to users comfortable with digital interfaces and requiring more configuration options.
Does the system require automatic heating/cooling changeover?
If your system uses a central signal to switch all zones between heating and cooling mode, as in heat pump systems with seasonal changeover, specify the FC FC1D. Its CO terminal accepts a 230V signal and automatically changes the thermostat mode without user input. Neither the Apus nor the Volcano supports this function.
How many actuators does each zone require?
For large rooms or open-plan spaces served by multiple manifold loops from a single thermostat, specify the Apus RT-A1. It controls up to 5 thermal actuators simultaneously from one thermostat. For standard single-actuator zones, all three models are suitable. For multi-room centralized control, integrate any model with the Legom base station.
Once you have confirmed these three parameters, the Legom team can confirm the correct model and arrange samples. Contact us via WhatsApp or info@legomsmart.com.
Manufacturing Capacity
Legom's room thermostat production facility is located in Jiaxing, Zhejiang Province, China. The facility operates dedicated PCB assembly lines, SMD component mounting, burn-in testing equipment, and function testing stations, enabling consistent high-volume output with full unit-level traceability for OEM supply chains.
| Parameter | Detail |
|---|---|
| Production Location | Jiaxing, Zhejiang Province, China |
| MOQ | 1000 units |
| Lead Time — Standard Models | Confirmed at order; contact the team for current scheduling |
| Lead Time — Custom / ODM | Project-based; agreed with the engineering team at specification stage |
| Primary Export Markets | Europe (primary); 90+ countries served globally |
| Shipping Methods | Sea freight / Air freight / Express courier |
| Quality Inspection | 100% PCB function testing and burn-in test before dispatch; batch certificates available on request |
| Certifications | CE, RoHS |
| OEM Partners | 400+ globally |
Legom's room thermostats are integrated into underfloor heating systems, heat pump installations, and smart building projects across European and international markets. With 400+ OEM partners in 90+ countries, CE and RoHS certification, and in-house electronics manufacturing from PCB assembly through functional burn-in testing, Legom provides the production consistency and documentation required by professional HVAC system integrators and distributors.
Production Process
5-Stage Production Process
Every Legom room thermostat passes through a structured 5-stage electronics manufacturing process — from PCB component assembly through final functional testing — ensuring reliable performance and batch-level traceability for OEM supply chains.
PCB Component Assembly
SMD components placed and soldered onto PCB using automated pick-and-place equipment
PCBA Assembly Line
Assembled PCBs integrated into thermostat housings with display and interface components
Electronics Workshop
Firmware flashing, parameter configuration, and wiring verification on dedicated electronics workstations
Burn-in Test
Control boards run under power for extended period to identify and eliminate early-failure components before dispatch
Function Testing
100% PCB function test — sensor response, relay output, display, and parameter operation verified on every unit
Each Legom room thermostat is manufactured through a controlled electronics production process. PCBs are assembled using automated SMD equipment, integrated into thermostat housings, flashed with firmware, and subjected to burn-in testing and full functional verification before packaging. Every unit is individually tested for sensor response, relay output, display function, and parameter operation before dispatch.
What Legom's OEM Service Covers
Legom's OEM and ODM service for room thermostats covers the full development and production cycle:
- ● Model selection and specification review — Legom's engineering team reviews your system requirements — control interface, voltage range, sensor configuration, actuator capacity, and changeover functionality — against the standard catalogue to identify the correct model.
- ● Firmware customization — Default parameter values (temperature compensation, protection thresholds, display behavior, power-on mode) can be customized to match your system's operating requirements or your brand's default configuration.
- ● Housing and interface customization — Colour, label printing, display language, and button layout can be customized for OEM clients supplying thermostats under their own brand into specific regional markets.
- ● Sample and approval cycle — Samples are produced and functionally tested against your specification before production commitment. CE test documentation can be arranged for regulatory submission.
- ● Private label / white label — Thermostats can be supplied under your brand with custom packaging, product labels, and installation documentation. All OEM projects are handled under strict confidentiality.
- ● System integration support — For clients integrating Legom thermostats with third-party manifolds, actuators, or base station systems, Legom's engineering team can provide wiring diagrams, compatibility confirmation, and technical documentation.
Applications
Legom room thermostats are used wherever individual zone temperature control is required in water-based heating and cooling systems — from single-room residential installations through multi-zone commercial buildings.
Underfloor Heating Systems
The primary application for Legom room thermostats is in water-based underfloor heating systems, where each thermostat controls one or more thermal actuators on the manifold to regulate the floor circuit flow for a single zone. The thermostat senses the room air temperature (or floor surface temperature via external probe) and opens or closes the actuator to maintain the set point. The Apus RT-A1, FC FC1D, and Volcano RB-2305HT are all suited to this application. For complete system components, see also Legom's thermal actuators, manifolds, and floor heating pipes.
Heat Pump Systems with Heating and Cooling
Heat pump installations that provide both underfloor heating in winter and radiant cooling in summer require a thermostat that can switch operating modes automatically. The FC FC1D is the specified model for this application — its CO terminal accepts a 230V changeover signal from the heat pump controller, automatically switching the thermostat between heating and cooling mode without user intervention. This is particularly relevant for four-pipe fan coil systems and reversible heat pump installations in mild-climate markets.
Residential Multi-Zone Control with Base Station
For multi-room residential installations where the installer or homeowner wants centralized temperature management, all three Legom thermostats can be integrated with the Legom base station. The base station connects to the heat source (boiler or heat pump) and all zone thermostats, coordinating zone demand signals and heat source activation. This enables whole-house temperature management from a single interface while maintaining individual room temperature control at each thermostat.
Commercial and Hospitality Buildings
In hotels, serviced apartments, and small commercial buildings, room thermostats provide individual zone temperature control for each room or unit. The child lock function on the FC FC1D prevents unauthorized temperature changes by guests or building occupants — making it suited to hospitality and care facility installations where temperature limits need to be enforced. The minimal aesthetic of the Volcano RB-2305HT in White, Black, or Grey suits premium interior specification.
Fan Coil and Air Handling Units
Room thermostats can also control fan coil units in buildings without underfloor heating — using the thermostat output to control a fan coil valve or a relay that switches the fan unit. The FC FC1D's wide voltage range (100–240VAC) and CO changeover capability make it particularly suited to installations where the same fan coil serves heating and cooling from a central system. See also Legom's HVAC valve range for compatible fan coil component valves.
OEM Integration into Complete HVAC Systems
Legom supplies room thermostats to OEM system integrators who bundle thermostats with manifolds, actuators, and controls as complete underfloor heating kits. For these clients, Legom offers firmware parameter customization, private label packaging, and volume supply from 100 units. The thermostat's compatibility with Legom thermal actuators, base stations, and manifolds — all manufactured at the same facility — simplifies system-level certification and technical support for OEM kit manufacturers.
Frequently Asked Questions
Legom manufactures three room thermostat models: the Apus RT-A1 (rotary-push knob, up to 5 actuators, 230VAC), the FC FC1D (button panel, auto CO changeover, child lock, WiFi indicator, 100–240VAC), and the Volcano RB-2305HT (circular display, ±1°C accuracy, three colour variants, 100–240VAC). All three support water-based underfloor heating and cooling, NTC sensor configurations, and integration with the Legom base station for centralized multi-zone control.
The Apus RT-A1 is distinguished by its rotary-push knob interface and its capacity to control up to 5 thermal actuators simultaneously — making it the right choice for large zones or users who prefer tactile knob control. The FC FC1D is the only model with an automatic CO changeover terminal, which switches the thermostat between heating and cooling mode on a 230V signal — essential for reversible heat pump systems. It also adds child lock and WiFi indicator functions. The Volcano RB-2305HT offers the widest voltage range (100–240VAC), the highest temperature accuracy (±1°C), and the broadest colour selection (White, Black, Grey) in a minimal circular-display aesthetic.
Yes. All three Legom room thermostats are designed specifically for water-based underfloor heating systems. They are compatible with Legom's own thermal actuators (M30 × 1.5 thread, NC and NO types) as well as third-party actuators with standard wiring. The NTC sensor supports both room air temperature sensing and floor surface temperature sensing via external probe — the latter being the standard mode for underfloor heating where floor surface temperature limits need to be monitored and capped independently of room air temperature.
The Legom base station is a central controller that connects to all room thermostats in a multi-zone system and manages heat source activation based on aggregate zone demand. Without a base station, each thermostat operates as a standalone controller — opening and closing its actuator independently based on room temperature. This is sufficient for simple single-zone or multi-zone systems where the boiler or heat pump is controlled separately. The base station is needed when you want centralized demand management across all zones — preventing the heat source from running when no zone actually requires heat, and coordinating changeover signals in heating/cooling systems. All three Legom thermostats are base station compatible. See the Legom base station page for full specifications.
All Legom room thermostats are CE and RoHS certified. CE certification confirms compliance with European safety, electromagnetic compatibility, and low-voltage directive requirements. RoHS confirms that the electronic components comply with restrictions on hazardous substances. Certification documentation is available upon request for regulatory submission and procurement compliance purposes.
Yes. Legom thermostats use a standard relay output that is compatible with most 230VAC thermal actuators regardless of brand, as long as the actuator's electrical rating falls within the thermostat's output capacity. Both NC (normally closed) and NO (normally open) actuator configurations are supported. The Apus RT-A1 explicitly supports both NC and NO configurations and can drive up to 5 actuators simultaneously. For confirmation of compatibility with a specific third-party actuator, contact the Legom technical team with the actuator's wiring diagram and electrical specification.
Yes. Legom supplies room thermostats to OEM clients under private label with custom packaging, product labels, and installation documentation. Firmware parameter defaults can be adjusted to match your system's requirements. Housing colour, label printing, and display language customization are available subject to minimum order quantities. All OEM projects are handled under confidentiality agreements. Contact the Legom sales team via WhatsApp or info@legomsmart.com to discuss your OEM requirements.
MOQ is 1000 units for standard catalogue models. Lead time for standard orders is confirmed at the time of order — contact the Legom team for current production scheduling. For OEM or custom firmware orders, lead time is project-based and agreed with the engineering team at the specification stage.
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 — commercial invoice, packing list, certificate of origin, and production test reports — is provided with every shipment.