Sonoff-C Thermostat Core Zigbee Smart Thermostat | TP-WGZBA
Sonoff-C Thermostat Core Zigbee Smart Thermostat | TP-WGZBA
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Sonoff Thermostat Core Zigbee Smart Thermostat | TP-WGZBA
The SONOFF Thermostat Core (TP-WGZBA) is a flush-mounted Zigbee 3.0 wall thermostat for water (hydronic) heating systems and boilers. It has a powered relay output for heating actuators and a separate potential-free dry contact for a boiler, a physical dial for setting the temperature, and weekly heating plans managed through a SONOFF Zigbee gateway.
Color: White
Two Outputs for Hydronic Heating & Boilers: The active relay output drives heating actuators up to 3A (resistive load), and the passive dry-contact output (COM / NO) switches a boiler without putting voltage on its terminals.
Three Weekly Heating Plans: Store three independent temperature plans, each covering a full week with up to 12 time periods per day, and switch between weekday, weekend or holiday routines.
Dial Control & Presence Wake-Up: Set the temperature with the physical dial. Built-in radar presence sensing wakes the display when you approach (detection distance about 0.3 m, 0.6 m or 1 m), and the screen brightness is adjustable.
Window-Open Detection & Remote Sensor: When a window is opened the thermostat stops calling for heat. It can also link to a SONOFF door/window sensor, and use a SONOFF Zigbee temperature sensor on the same gateway as the room-temperature source for more accurate readings. Child lock and anti-freeze mode are included.
Who it's for / Works with: Homes with hydronic (water) underfloor heating or a boiler that want app, schedule and automation control. It needs a SONOFF Zigbee gateway with the eWeLink app; Apple Home is supported through a SONOFF Matter bridge, and it works with Zigbee2MQTT (2.14.0 or newer for full functionality).
Good to know: Designed for water heating systems — electric underfloor heating mats generally exceed 3A and must not be connected directly. Native ZHA support is still in progress. An external NTC floor sensor (10KΩ, B3950) is supported but not included. Italian 503 back boxes need an adapter.
Technical Specifications
| Specification | TP-WGZBA |
|---|---|
| Wireless | Zigbee 3.0 (IEEE 802.15.4) |
| Applicable system | Water (hydronic) heating system |
| Installation | Flush wall mount; in-wall depth 31.5 mm; screw hole distance 60 mm |
| Rated input | 100-240V~ 50/60Hz, max 3A |
| Actuator output | Active relay output, max 3A resistive load |
| Boiler output | Passive dry contact (COM, NO) |
| Temperature setting range | 5°C – 30°C |
| Radar detection distance | Low ≈0.3 m / Medium ≈0.6 m / High ≈1 m |
| External floor sensor | 10KΩ NTC, B value 3950K (not included) |
| Dimensions | 86 × 86 × 45.5 mm |
| Net weight | 155 g |
| Operating temperature | 0°C – 50°C |
| Operating humidity | ≤90% RH, non-condensing |
| Housing material | PC |
| Recommended wire | 24AWG – 12AWG (0.2 – 3.5 mm²) |
| Automatic operation cycles | 10,000 |
| Certification | CE, RoHS |
📄 User manual: Download the official SONOFF TP-WGZBA user manual (PDF)