As the colder months approach, keeping your home comfortable without wasting energy becomes a priority. However, many heating systems still rely on conventional thermostats with limited scheduling options and little integration with modern smart home ecosystems.
This is where the SONOFF Thermostat Core Zigbee (TP-WGZBA) comes in. This smart thermostat is designed to bring intelligent heating control to your home, allowing you to manage temperatures, create heating schedules and automate your heating system.
Integrating heating into a smart home ecosystem is one of the most useful applications of home automation, allowing different devices and systems to adapt to your daily routine and comfort requirements.
Featuring Zigbee 3.0 connectivity, a modern display and two different control outputs, the SONOFF Thermostat Core offers an interesting solution for compatible hydronic heating systems, underfloor heating and boilers.
In this review, we will take a closer look at its main features, technical specifications, installation requirements, smart home compatibility and whether it is worth considering for your heating installation.
What is the SONOFF Thermostat Core Zigbee?
The SONOFF Thermostat Core TP-WGZBA is a Zigbee 3.0 smart thermostat designed to control compatible heating systems through temperature regulation, scheduling and home automation.
Unlike conventional thermostats, which offer basic temperature control, this device allows users to integrate their heating system into a smart home environment.
You can set a target temperature and let the thermostat automatically activate or deactivate the heating depending on the measured room temperature.
One of its most interesting features is its dual-output design:
- Powered relay output: designed to control compatible actuators used in hydronic underfloor heating systems, with a maximum load of 3 A.
- Dry contact output: designed to control compatible boilers through a potential-free thermostat connection.
This makes the device particularly interesting for water-based heating installations, where different control configurations are commonly used.
The thermostat also features a front display and a physical rotary control, allowing users to adjust the temperature directly without always needing a smartphone.
SONOFF Thermostat Core: Main technical specifications
Before looking at its smart features, let’s review the main technical specifications.
| Feature | Specification |
|---|---|
| Model | TP-WGZBA |
| Manufacturer | SONOFF |
| Connectivity | Zigbee 3.0 |
| Power supply | 100–240 V AC |
| Powered relay output | Up to 3 A |
| Boiler control | COM/NO dry contact |
| Temperature range | 5–30 °C |
| Scheduling | 3 weekly schedules |
| Daily programming | Up to 12 periods |
| Temperature sensor | Built-in |
| External sensor | Optional NTC 10 kΩ |
| Presence detection | Yes |
| Open-window detection | Yes |
| Installation | Wall-mounted, flush installation |
| Dimensions | 86 × 86 × 45.5 mm |
One important consideration is that the SONOFF Thermostat Core requires a compatible Zigbee hub. It does not operate as a standalone WiFi thermostat.
1. Dual outputs for different heating systems
One of the most interesting features of the SONOFF Thermostat Core is its dual-output configuration.
This allows the thermostat to work with different heating applications rather than being limited to a single type of connection.
Hydronic underfloor heating control
The first output is a powered relay designed to control compatible electric actuators commonly used in hydronic underfloor heating systems.
In these installations, actuators control the opening and closing of water circuits, allowing individual heating zones to be managed.
The thermostat measures the room temperature and activates the output whenever the measured temperature falls below the selected setpoint.
Once the desired temperature is reached, the output switches off and the heating demand stops.
The powered output supports a maximum load of 3 A and operates with a 100–240 V AC supply.
Before connecting an actuator, it is essential to check its electrical specifications and whether it uses a normally open or normally closed operating logic.
Boiler control through a dry contact
The second output is particularly useful for compatible boiler installations.
It features a potential-free dry contact using the COM and NO terminals, allowing the thermostat to send an ON/OFF heating demand to a boiler equipped with a compatible thermostat input.
Its operating principle is straightforward:
- When the room temperature falls below the setpoint, the COM-NO contact closes and requests heating.
- When the selected temperature is reached, the contact opens and the heating demand stops.
This allows compatible boilers to be controlled through a conventional ON/OFF thermostat connection.
Important: The COM-NO output is a potential-free contact. It must not be connected directly to 230 V. Always check the boiler manufacturer’s wiring diagram and thermostat input specifications before installation.
If you are interested in other solutions for automating equipment through a potential-free contact, take a look at our SONOFF MINI-ZBD review: a Zigbee dry contact smart switch. It is particularly useful for automating garage doors, boilers and other equipment with external control inputs.
2. Weekly scheduling with up to 12 daily periods
One of the main advantages of installing a smart thermostat is the ability to adapt heating operation to your daily routine.
There is little reason to maintain the same temperature throughout the day if nobody is at home for several hours.
The SONOFF Thermostat Core supports up to three independent heating schedules, with weekly programming and up to 12 temperature periods per day.
This allows you to create different temperature settings depending on the time of day.
For example:
- Morning: Set a comfortable temperature before waking up.
- Working hours: Reduce the temperature while everyone is away.
- Afternoon: Restore the comfort temperature before returning home.
- Night: Maintain a more moderate temperature during sleeping hours.
Having three independent schedules also makes it easier to adapt heating operation to different routines, including weekdays, weekends and holidays.
Once configured, the thermostat automatically follows the selected schedule, reducing the need for constant manual adjustments.
3. Smart open-window detection
This is another particularly useful feature during the winter months.
How many times have you left your heating running while opening a window to ventilate a room?
When a window is opened, the room temperature can drop quickly. If the heating continues operating during ventilation, energy may be wasted compensating for heat losses that could otherwise be avoided.
The SONOFF Thermostat Core features automatic open-window detection based on sudden temperature changes.
It can also work with compatible door and window sensors to identify when ventilation takes place.
When an open window is detected, the thermostat can activate its protection mode and stop requesting heating, helping to avoid unnecessary operation.
This feature is particularly useful when you want to automate your heating system without constantly having to intervene manually.
4. Presence detection for smarter heating management
The thermostat also incorporates a presence sensor that detects when someone approaches the device.
When presence is detected, the display can automatically wake up, making it easier to read the information and adjust the settings.
When nobody is nearby, the display switches off to avoid unnecessary illumination.
SONOFF also provides presence-related automation features that can be used as part of a wider smart heating setup.
This opens up possibilities for creating automation routines that consider both scheduled heating and room occupancy.
However, it is important to understand that proximity detection is not the same as a complete room occupancy monitoring system. It does not guarantee that a room is occupied or empty.
5. More accurate temperature monitoring with external sensors
In certain installations, the temperature measured by a thermostat mounted on the wall may not accurately represent the actual room temperature.
This can happen for several reasons:
- The thermostat’s installation location.
- Proximity to heat sources.
- Wall temperature variations.
- Internal heating generated by electronic components.
To address this, SONOFF supports compatible external Zigbee temperature sensors as an alternative temperature measurement source.
Compatible models include:
- SNZB-02.
- SNZB-02P.
- SNZB-02D.
- SNZB-02WD.
- SNZB-02LD.
- SNZB-02B.
- SNZB-02M.
This allows users to place a sensor in a more representative location and use its readings to manage the room temperature.
The thermostat also supports temperature calibration to compensate for potential measurement deviations.
Keep in mind that the external sensor needs to be paired with the same compatible Zigbee gateway.
6. Temperature history and heating activity monitoring
Another useful feature is the ability to review historical heating information.
The device allows users to monitor three main parameters:
- Target temperature or setpoint.
- Actual room temperature.
- Heating activity.
Historical information can be stored for up to six months.
This can be useful for analysing how the heating system behaves, checking when heating demand has been activated and comparing the target temperature with the actual room temperature.
However, the device is not an electricity or thermal energy meter. Its operating history should not be confused with direct energy consumption measurements.
7. Safety features: child lock and frost protection
The SONOFF Thermostat Core also includes several features designed to improve safety and heating system operation.
Child lock: Prevents accidental changes to the thermostat settings through the physical controls.
Frost protection: Provides a protection function designed to help prevent excessively low temperatures.
External NTC sensor protection: Allows users to connect a compatible floor temperature probe to monitor floor temperature and provide overheating protection.
This function requires a 10 kΩ NTC sensor with a beta value of 3950 K. The probe is not included with the thermostat and must be purchased separately when required.
8. Zigbee, eWeLink and Home Assistant compatibility
Since the SONOFF Thermostat Core uses Zigbee 3.0, it requires a compatible gateway to connect to a smart home system.
Within the SONOFF ecosystem, it can be integrated through compatible devices such as:
- SONOFF ZBBridge-P.
- SONOFF ZBBridge-U.
- SONOFF NSPanel Pro.
- SONOFF NSPanel Pro Gen2.
- SONOFF iHost.
- SONOFF Bridge-M.
Another interesting option within the SONOFF ecosystem is the SONOFF NSPanel Pro Gen2, a smart wall-mounted control panel featuring a Zigbee 3.0 hub that allows you to centralize the management of different smart home devices.
It is important to check the required firmware and eWeLink app versions for each gateway before installation.
If you are interested in other SONOFF solutions for electrical installations and smart home automation, check out our SONOFF Basic DIN Rail comparison: Zigbee vs WiFi, where we explain the differences between both communication technologies and their practical applications.
Is the SONOFF Thermostat Core compatible with Home Assistant?
Yes. The device can also be integrated into Home Assistant-based smart home installations.
One option is Zigbee2MQTT, which requires version 2.14.0 or later for this device.
If you want to build a local smart home system using Home Assistant, one interesting option is the SONOFF Dongle Max, a Zigbee and Thread coordinator that allows you to manage compatible devices without relying on proprietary manufacturer hubs.
With ZHA, users should check the available manual configuration procedure and potential integration limitations to access the supported functions.
Therefore, if you already use Home Assistant, it is worth checking software versions and compatibility before purchasing the thermostat.
It is also important to distinguish between basic Zigbee connectivity and the availability of every advanced feature on each smart home platform.
9. Can it control electric heating systems?
This is one of the most important questions to consider before purchasing the device.
Although the SONOFF Thermostat Core includes a powered relay output rated up to 3 A, it is not designed to directly control every type of electric heating system.
Its main applications are hydronic heating systems and compatible boilers.
For example, if you have an electric underfloor heating system with a heating element that draws more than 3 A, you cannot connect it directly to the thermostat output.
In that situation, an appropriately rated contactor or another suitable power switching solution would need to be considered, provided that the control arrangement is compatible with the installation.
A thermostat designed for hydronic underfloor heating should not automatically be considered suitable for directly switching electric heating elements.
10. Installation and wiring: what should you check?
The SONOFF Thermostat Core is designed for flush wall installation.
Its dimensions are 86 × 86 × 45.5 mm, with an approximate flush mounting depth of 31.5 mm.
Before replacing an existing conventional thermostat, several aspects of the electrical installation should be checked.
1. Electrical power supply
The device requires both live and neutral conductors (L and N). Therefore, you should not assume that every existing thermostat installation can be replaced using only the two wires already present.
2. Heating system type
Identify whether you are controlling a boiler through a dry contact or a hydronic underfloor heating actuator through the powered output.
3. Actuator or boiler input type
Check whether the actuator uses normally open or normally closed logic and identify the type of control input required by the boiler.
4. Available installation space
Check the dimensions of the wall mounting box and the available depth for the device and its wiring connections.
5. Safety configuration
Review the heating control parameters and ensure that all electrical protection devices and system limitations are correctly configured.
Always disconnect the electrical supply before carrying out installation work. If you are not qualified to identify conductors and verify wiring diagrams, the installation should be carried out by a qualified professional.
Is the SONOFF Thermostat Core Zigbee worth buying?
After reviewing its features, the SONOFF Thermostat Core is an interesting option for anyone looking to upgrade their home heating with smart control and automation.
Its main advantage is combining temperature regulation, weekly scheduling and Zigbee smart home integration in a single device.
The dual-output configuration is particularly useful because it supports two common heating applications: compatible hydronic underfloor heating actuators and boilers with ON/OFF dry-contact control.
The main advantages include:
- Zigbee 3.0 connectivity.
- Dual heating control outputs.
- Advanced weekly scheduling.
- Open-window detection.
- External temperature sensor support.
- Heating activity history.
- Integration with different smart home platforms.
- Modern display with physical rotary control.
However, there are some important limitations to consider. It requires a compatible Zigbee gateway, needs a live and neutral power supply and cannot directly control every type of electric heating system.
If you have a compatible water-based heating installation or boiler and want to integrate it into your smart home ecosystem, this thermostat is definitely worth considering.
SONOFF Thermostat Core price and where to buy
If you are considering upgrading your heating system with a smart thermostat, you can check the latest price of the SONOFF Thermostat Core TP-WGZBA directly through the official SONOFF store.
We also have an exclusive discount code for the AutomatismosMundo community.
DISCOUNT CODE: AXLM10
Use the code AXLM10 to get 10% OFF across the entire official SONOFF online store.
You can use it to purchase the Thermostat Core as well as other smart home devices, Zigbee sensors, smart switches and accessories.
BUY SONOFF THERMOSTAT CORE ZIGBEE – OFFICIAL SONOFF STORE
Enter the discount code AXLM10 at checkout to apply your 10% discount.
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Final thoughts: make your home heating smarter with SONOFF
Smart home technology is evolving towards more integrated systems that do much more than simply switch devices on and off remotely.
The SONOFF Thermostat Core Zigbee is a good example of this evolution. By combining temperature control, scheduling, external sensors and automation features, it provides new possibilities for managing home heating more efficiently.
However, as we have seen throughout this review, checking system compatibility and electrical installation requirements is essential before purchasing.
At AutomatismosMundo, we will continue exploring devices that make home automation and industrial technology more accessible to everyone, from beginners to experienced professionals.
What do you think about the new SONOFF Thermostat Core? Would you install it in your home?
