RT51.23i WiFi Hydronic Heating Thermostat
MENRED RT51.23i is a WiFi hydronic heating thermostat designed for water-based underfloor heating systems. It provides accurate room temperature control, programmable heating schedules and smart APP operation for residential and commercial heating applications.
With WiFi connectivity and potential free output function, RT51.23i can be integrated with hydronic heating systems including thermal actuators, valves and heating zones, providing flexible control solutions for modern radiant heating applications.
The thermostat features a clear 3.5-inch display, weekly programmable schedule and user-friendly operation. Users can customize heating periods according to daily routines, improving indoor comfort while reducing unnecessary energy consumption.
RT51.23i is a smart programmable thermostat developed by MENRED for controlling hydronic underfloor heating systems.
Unlike electric floor heating thermostats that directly control heating cables or mats, hydronic heating thermostats manage room temperature by controlling heating system components such as thermal actuators and valves.
The RT51.23i combines programmable temperature control, WiFi remote management and potential free output, making it suitable for water-based heating systems in homes, apartments, hotels and commercial buildings.
RT51.23i WiFi model allows users to adjust room temperature anytime and anywhere through smart devices, providing convenient remote heating management.
Designed for water-based underfloor heating applications, RT51.23i works with hydronic heating systems requiring reliable room temperature control.
The potential free output function provides flexible connection options for different heating control systems and improves compatibility with various applications.
Users can customize heating schedules according to daily routines, including waking up, leaving home, returning home and sleeping periods.
The preheat function allows the thermostat to reach the scheduled temperature in advance, ensuring a comfortable environment when needed.
The thermostat can detect open window conditions and reduce unnecessary heating operation to improve energy efficiency.
Child lock prevents accidental operation and keeps heating settings secure.
RT51.23i is designed for hydronic heating systems where temperature control is required for different heating zones.
Typical system configuration:
The thermostat helps maintain comfortable indoor temperature by controlling heating operation according to preset values and user schedules.
| Voltage | AC220V / AC230V 50Hz |
| Rated Power | <1.5W |
| Relay Load | 3A |
| Signal Terminal | 0.75mm² Wire |
| Temperature Range | 5℃ ~ 90℃ |
| Measuring Range | -9.5℃ ~ 99.5℃ |
| Protection Class | IP20 |
| Ambient Temperature | -10℃ ~ 55℃ |
| Model | Load | Function |
| RT51.13 | 3A | Hydronic heating |
| RT51.23i | 3A | Hydronic heating, WiFi control, potential free output |
| RT51.36 | 16A | Electric heating, time control, external sensor |
| RT51.36i | 16A | Electric heating, WiFi control, external sensor |

| Attribute | Value |
|---|---|
| Model NO. | RT51.23i |
| Product Type | WiFi Hydronic Heating Thermostat |
| Heating System | Hydronic Underfloor Heating System |
| Control Function | Room Temperature Control, Weekly Programming, WiFi APP Control |
| Relay Output | 3A |
| Output Type | Potential Free Output |
| Voltage | AC220V / AC230V 50Hz |
| Rated Power | <1.5W |
| Signal Terminal | 0.75mm² Wire |
| Temperature Range | 5℃ ~ 90℃ |
| Measuring Range | -9.5℃ ~ 99.5℃ |
| Protection Class | IP20 |
| Material | Anti-Flammable PC |
| Ambient Temperature | -10℃ ~ 55℃ |
| Design Style | Modern European Design |
| Certification | CE, ISO9001 |
| Trademark | MENRED |
The MENRED RT51.23i is designed for modern hydronic underfloor heating applications where reliable temperature control and smart management are required.
With WiFi connectivity, users can remotely adjust heating settings through mobile devices. The thermostat supports programmable schedules, allowing heating operation to match different daily routines.
The potential free output provides flexible connection options for hydronic heating systems, making RT51.23i suitable for applications requiring compatibility with different heating control components.
MENRED is a professional thermostat manufacturer providing heating control solutions for global HVAC partners.
With experience in floor heating control systems, MENRED supports OEM and ODM cooperation including product customization, packaging solutions and technical support.
RT51 series thermostats are developed for distributors, heating contractors and project suppliers looking for reliable heating control products.


Since its inception in 1995, Zhejiang Menred Comfort System Co., Ltd., affectionately known as Menred, has firmly established itself as a beacon of innovation and excellence in the global manufacturing industry. Specializing in 'radiant heating and cooling, ventilation, water purification, and smart home' systems, Menred is not only a trusted partner of the National Key Laboratory of 'Future Building' but also proudly serves as a certified factory for Electrolux AB, a leading name in the global appliance arena. At 'MENRED Comfort Home', we have ambitiously evolved from mere temperature control solutions to comprehensive systematic air conditioning systems. Our focus is not just on cost-effective solutions but on pioneering energy efficiency, putting the user's needs at the heart of our product development. Our passion extends to creating sublime comfort home product solutions, spearheading the innovative development of green building equipment, and delving into the engineering application and research of Building Integrated Photovoltaic (BIPV) and energy storage solutions. Within the esteemed Menred group, we proudly house 4 National High-tech Enterprises alongside 3 enterprises recognized for High-quality Technological Advancement. These enterprises have not only been conferred with the prestigious national title of Technologically Advanced Little Giant' but also have been distinguished as Service Oriented Manufacturing Demonstration Enterprises, signifying our commitment to excellence and innovation.



