Are you tired of smart thermostats that feel complicated or don’t suit your needs? Some smart thermostats on the market have designs that make operation difficult, like unclear displays, confusing interfaces, hard-to-press buttons, or even specs that don’t meet your local standards.
Legom understands your frustration. That’s why we create thermostat products based on real user needs. If you want to understand more about how different thermostat models compare before making a decision, you can read our guide on room thermostat facts and product variations. Additionally, we also accept OEM/ODM of your custom room thermostats production. It is as easy as you share your requirements with us, then we will do our best to meet them! Check our factory video below for your reference.
Now, let’s go through what makes our thermostats different from the rest.
Contents
- 1 Appearance and Structure
- 2 Smart Functions That Make a Difference
- 3 Product Quality and Design Upgrades
- 4 Easy Installation and Maintenance Design
- 5 Why Legom Smart Thermostats Are the Right Choice
- 6 Frequently Asked Questions
- 6.1 What standards do Legom smart thermostats support?
- 6.2 What does NO/NC mean on a thermostat specification?
- 6.3 How do I read and respond to the fault codes on a Legom thermostat?
- 6.4 What is the operating voltage range of Legom smart thermostats?
- 6.5 Can Legom thermostats be customized for OEM or ODM production?
Appearance and Structure
We’ve designed two main versions of our thermostat to match different decoration styles and regulations: British Standard and European Standard.
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British Standard Thermostat Shell
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European Standard Thermostat Shell
Key Materials and Construction
- Two Options: British Standard and European Standard
- Surface Sticker: 0.8mm thick, PC material, coated for durability
- Surface Cover: PC+ABS alloy, flame-retardant, passes glow wire test, with laser-marked buttons
- Control Board: Double-layer PCB, plug-in and patch process
- Inner Cover: PC+ABS alloy, for insulation between control board and power board
- Power Board: Double-layer PCB, connects power supply, heating devices, sensors, etc.
- Base: Flame-retardant material, laser-marked wiring guide on the back
Thermostat Models to Fit Your Needs
British Standard Single Heating
British standard single heating
- Wide voltage: 100V to 240V
- NO/NC options
- Dry contact and NTC interfaces
- Program with temperature sampling (IN/OUT/ALL)
UK Standard Dual Heating + WiFi
UK standard dual heat supply + wifi
- 5 modes: Cooling, floor heating, air heating, combined heating, ventilation
- Adjustable air volume: high, medium, low
- Dry contact and NTC interfaces
- Wide voltage: 100V to 240V
British Standard Electric Floor Heating
British standard electric floor heating
- Single panel load: approx. 3500W
- 4mm² wire terminals
- NTC interface
- Temperature sampling (IN/OUT/ALL)
European Standard Single Heating
- Wide voltage: 100V to 240V
- NO/NC options
- NTC interface
- Temperature sampling program
European Standard Single Heating 24V
European standard single heating 24V
- Voltage design: 24V
- NO/NC options
- NTC interface
- Temperature sampling (IN/OUT/ALL)
European Standard Dual Power
European standard dual power generation
- Heating default when powered on
- CO terminal: 220V for cooling switch
- NTC interface
- Temperature sampling
Smart Functions That Make a Difference
Fault Codes for Easy Troubleshooting
If something goes wrong, our thermostat shows clear fault codes so you can identify the issue quickly without needing a technician for basic diagnostics.
- E1: Internal sensor short circuit
- E2: Internal sensor open circuit
- E3: External sensor short circuit
- E4: External sensor open circuit
Advanced Settings for Precise Temperature Control
You can easily adjust temperature compensation, starting temperature difference, and high and low temperature protection settings directly from the thermostat interface. For guidance on how to configure these settings to maximize energy efficiency, you can read our article on room thermostat settings for energy efficiency.
Factory Reset for Quick Recovery
Made a mistake in your settings? No problem. Simply restore factory settings anytime to return the thermostat to its original configuration without any technical support required.
Product Quality and Design Upgrades
We care about every detail of our smart thermostats, from production to your hands.
High-Quality Circuit Boards
Our SMT circuit boards are made in dust-free, anti-static environments and go through full inspection at every production stage.
Inductive Touch Buttons
Stronger control sensitivity and longer lifespan than traditional touch switches, so the buttons remain responsive even after years of regular use.
Wide Voltage Switching Power Supply
No more worries about voltage compatibility. Our design supports 100V to 240V worldwide, which means the same thermostat model works across different markets without any modifications.
Durable, Clean Look
Forget peeling paint. Our matte white surfaces use laser engraving for button markings. This method is eco-friendly and significantly more durable than traditional printing.
Clear, Bright Display
Brighter and softer LED display with no visual blind spots. Easy to read at any angle and from across the room.
Shockproof Packaging
We’ve replaced paper supports with pearl cotton for better protection during transport, reducing the risk of damage before the product reaches you.
Premium Packaging
Upgraded to 300g white paper with UV coating. Strong, bright, and professional in appearance for both direct sale and OEM branding requirements.
Protective Blister Film
Keeps your thermostat clean during installation and protects the surface from paint, dust, and scratches until the unit is fully set up.
Easy Installation and Maintenance Design
Integrated Shell Design
No gaps, no dirt traps. The seamless shell design means cleaning is straightforward and the thermostat stays looking new even after years of use.
Protective Buckles
We added left and right protective buckles to prevent the panel from falling during installation, which makes the process safer and more reliable for installers working in confined spaces.
Optimized Screwdriver Access
Our design fits most screwdriver sizes and prevents damage to internal parts. The screwdriver insertion hole also complies with IEC standards to ensure safe and consistent installation practice across markets.
“When we designed for both British and European markets at the same time, the hardest part was not the electrical specs. That part is clear. The real challenge was making the installation experience consistent and intuitive for installers who work with two or three different thermostat brands in the same week. Every detail, from the protective buckles that stop the panel dropping mid-installation, to the laser-engraved labels that do not fade, came directly from watching real installers work and asking them what wastes their time. A thermostat that is easy to install gets installed correctly. And a correctly installed thermostat is the one that actually delivers on its energy savings promise.”
— Maggie Shen, Founder of Legom
Why Legom Smart Thermostats Are the Right Choice
With all these thoughtful designs and user-friendly features, Legom smart thermostats are built to solve the common problems users face every day. From clear fault codes and wide voltage compatibility to shockproof packaging and integrated shell design, every detail has been considered with both the installer and the end user in mind.
You can explore the full product range on our room thermostat product page, or contact us directly to discuss your requirements. Let us know what you need and we will help you find the perfect thermostat solution, whether that is a standard unit or a fully customized OEM/ODM production run.
Frequently Asked Questions
What standards do Legom smart thermostats support?
Legom smart thermostats are available in two main standard configurations: British Standard and European Standard. Both configurations are designed to meet the regulatory and dimensional requirements of their respective markets. British Standard models use the 86mm x 86mm or 146mm formats common in the UK and markets that follow British electrical standards, while European Standard models use the 80mm round or 86mm square formats typical in continental Europe and many other regions. We also offer 24V versions for systems that operate on low-voltage control circuits, such as fan coil units and commercial HVAC installations.
What does NO/NC mean on a thermostat specification?
NO stands for Normally Open and NC stands for Normally Closed. These terms describe the default electrical state of the thermostat’s output relay when no heating or cooling demand is present. A Normally Open thermostat only closes the circuit (activates the heating device) when the room temperature drops below the setpoint. A Normally Closed thermostat keeps the circuit closed by default and opens it when the setpoint is reached. The correct choice depends on the type of heating system you are connecting. Most underfloor heating zone valves and boiler systems require one or the other, and choosing incorrectly can cause the system to run continuously or not at all.
How do I read and respond to the fault codes on a Legom thermostat?
Legom smart thermostats display fault codes directly on the LED screen when a sensor issue is detected. E1 indicates an internal sensor short circuit, E2 indicates an internal sensor open circuit, E3 indicates an external sensor short circuit, and E4 indicates an external sensor open circuit. Short circuit faults typically suggest a damaged or pinched sensor wire, while open circuit faults usually indicate a disconnected or broken sensor. If you see any of these codes, first check the sensor wiring connections at the thermostat base before replacing any components. Most sensor faults are resolved by re-securing a loose terminal connection.
What is the operating voltage range of Legom smart thermostats?
Most Legom smart thermostat models support a wide voltage input of 100V to 240V, which makes them compatible with electrical systems across Europe, the UK, Asia, the Middle East, and most other markets worldwide. This eliminates the need for voltage converters or market-specific hardware variants in most cases. We also offer a 24V model specifically for low-voltage applications such as fan coil unit control and commercial building automation systems. Always verify the rated voltage of your specific model before installation and ensure the wiring complies with local electrical codes.
Can Legom thermostats be customized for OEM or ODM production?
Yes. Legom accepts both OEM and ODM orders for custom room thermostats. OEM production allows you to use your own brand name, logo, and packaging on a Legom-manufactured thermostat, while ODM involves working with our team to develop a product design tailored to your specific functional or aesthetic requirements. We have experience producing custom thermostats for partners in more than 90 countries and can accommodate a wide range of customization options including voltage specifications, communication protocols, display styles, and housing colors. To start a discussion, simply share your requirements with our team and we will provide a proposal based on your needs.
Reviewed and updated by the LEGOM Technical Team on May 25, 2026. This article covers the design, construction, product models, smart features, and quality standards of Legom smart thermostats, based on Legom’s experience as a room thermostat manufacturer supplying HVAC temperature control solutions to partners in more than 90 countries worldwide.