Sonoff Thermostat Core TP-WGZBA Zigbee Thermostat

Product detailed description

Sonoff Thermostat Core: smart room thermostat for underfloor heating and boilers 

Sonoff Thermostat Core TP-WGZBA is a wall-mounted Zigbee thermostat for a flush-mounted wall box that controls hydronic underfloor heating as well as a gas or other boiler. It has two outputs: an active relay for underfloor heating actuators and a potential-free contact for the boiler. You set the temperature with a rotary dial right on the wall or in the eWeLink app, where you can schedule the whole week.

The thermostat communicates over Zigbee 3.0, so it needs a Zigbee gateway (for example Sonoff ZBBridge or iHost). This lets it join automations together with temperature and window sensors, and it also works in Home Assistant via Zigbee2MQTT.

One thermostat for actuators and the boiler

Most room thermostats can control either a boiler or underfloor heating. Sonoff TP-WGZBA handles both at once. The active relay output (max. 3 A, resistive load) powers 100 to 240 V AC thermoelectric actuators of hydronic underfloor heating. The potential-free COM/NO contact signals the boiler to start when a room needs heat and switches it off once the target temperature is reached. The boiler doesn't run needlessly and you save gas.

You set the output logic in the eWeLink app under heating system settings: NO actuator or NC boiler. So you don't need a different model depending on the actuators in your manifold.

Three weekly schedules with 12 time periods per day

The smart thermostat offers three independent weekly programs, each with up to 12 time periods per day. You can have one for a normal work week, another for home office and a third for holidays, and simply switch between them. Schedules run on the built-in real-time clock right in the thermostat, so they work even without internet and without a connection to the Zigbee gateway, as long as the thermostat has power.

Available modes are Automatic (by schedule), Manual and Anti-freeze (heating off with frost protection). You can also switch modes right on the thermostat by double-pressing the button.

A display that wakes up when you approach

The thermostat has a built-in radar presence sensor. The display lights up when you come close and turns off when you walk away, so it doesn't glow in the bedroom at night. You can set the sensitivity to three levels (about 0.3 m, 0.6 m and 1 m) and adjust the display brightness. The same sensor is also used for occupancy-based heating of the room.

You change the temperature with a smooth rotary dial from 5 to 30 °C, no tiny touch arrows. Parents will appreciate the child lock, which prevents unwanted changes.

More accurate temperature with a remote sensor

Every wall thermostat measures a temperature affected by the wall and its own electronics. Sonoff handles this properly: you can set a temperature offset or use a Zigbee temperature sensor placed elsewhere in the room as the temperature source. Supported sensors are SNZB-02, SNZB-02P, SNZB-02D, SNZB-02WD, SNZB-02LD, SNZB-02B and SNZB-02M, which must be connected to the same Zigbee gateway. You can find a suitable sensor, for example, in the temperature and humidity sensors category; a proven choice is the Sonoff SNZB-02D with display.

With underfloor heating you can also connect an external NTC 10 kΩ (B3950) floor probe, which protects the floor from overheating. The probe is optional and not included.

Open window detection and protection

When you air the room, the thermostat detects it in two ways: by a sharp temperature drop or by a Zigbee door/window sensor (SNZB-04, SNZB-04P, SNZB-04PR2) on the same gateway. Heating then switches to anti-freeze mode so you don't heat the street. It also offers frost protection, overheat protection and up to 6 months of heating history in the app (target and actual temperature and heating time).

Installation and wiring

The thermostat mounts in a standard wall box with 60 mm screw spacing; the in-wall depth is 31.5 mm. For power it needs both live (L) and neutral (N). If you have an old two-wire thermostat on the wall, it may not be a direct replacement and the wiring should be checked by an electrician. The terminals accept wires from 0.2 to 3.5 mm².

The model is also listed as TPWGZBA or Sonoff Thermostat Core. If you're looking for other options, see our full range of smart thermostats.

Who is this thermostat for

• Homes with hydronic underfloor heating that want to control each room separately.
• Owners of a gas or other boiler with a potential-free input for a room thermostat.
• Sonoff and eWeLink users who already have a Zigbee gateway or NSPanel Pro.
• Home Assistant fans with Zigbee2MQTT who want local heating control.
• New builds and renovations where both live and neutral are available in the box.

Use cases

• Underfloor heating thermostat for every room: each thermostat controls the actuators of its zone in the manifold.
• Smart thermostat for a gas boiler: the potential-free contact starts the boiler only when a room needs heat.
• Savings while airing: the window sensor stops heating while the window is open.
• Heating on your family's schedule: three weekly schedules for work, home office and holidays.
• Accurate temperature in the living room: the thermostat follows an SNZB-02 sensor placed away from the wall. ️
• Zigbee thermostat for Home Assistant: control and automations via Zigbee2MQTT without the cloud.

Key features

• Two outputs: 3 A active relay for actuators and a potential-free contact for the boiler.
• Zigbee 3.0: reliable network with Sonoff sensors and gateways; a Zigbee gateway is required.
• 3 weekly schedules: up to 12 time periods per day, running locally even without internet.
• Rotary dial: smooth temperature setting from 5 to 30 °C right on the wall.
• Radar presence sensor: the display wakes on approach and heating adapts to occupancy.
• Remote temperature sensor: support for SNZB-02 sensors and adjustable temperature offset.
• Open window detection: by temperature drop or with an SNZB-04 sensor.
• NTC floor probe: optional floor overheat protection.
• Protection: child lock, frost protection and overheat protection.
• 6-month history: overview of temperatures and heating time in the eWeLink app.

Technical specifications

Protocols and compatibility

• Zigbee 3.0 (IEEE 802.15.4): remote control requires a Zigbee gateway, for example Sonoff Zigbee Bridge PRO, Sonoff iHost, NSPanel Pro or a USB Zigbee coordinator.
• eWeLink: the main app for setting schedules, heating system type, temperature offset and history.
• Home Assistant: via Zigbee2MQTT from version 2.14.0. Native ZHA support has not been merged yet; a separate script is temporarily needed for all features.
• Apple Home: the thermostat is not a Matter device; it reaches Apple Home through the Matter bridge Sonoff Bridge Max (Bridge-M).
• SmartThings: via the separate SONOFF Edge driver.

Why choose Sonoff Thermostat Core

• One device controls both underfloor heating actuators and the boiler, so you don't need two thermostats.
• Schedules run locally, heating follows the schedule even during an internet outage.
• A physical dial and a display that only wakes when you approach are more convenient than touch panels.
• It fits into the Sonoff ecosystem with temperature and window sensors and also works in Home Assistant.

For higher-power electric underfloor heating, choose a thermostat with a 16 A relay instead, for example the MOES Zigbee thermostat for electric heating.

Frequently asked questions

Reviews of our store

All reviews of our store