Sonoff Thermostat Core (TP-WGZBA) smart thermostat, Zigbee, for water underfloor heating and boilers
Description
Sonoff Thermostat Core (TP-WGZBA) – Zigbee wall thermostat for water underfloor heating and boilers
The Sonoff Thermostat Core is a flush-mounted Zigbee 3.0 wall thermostat for hydronic underfloor heating (via actuators) and for boilers (via dry contact). It has two outputs: a 3A active output for actuators and a dry contact (COM, NO) for the boiler, with NO/NC logic configurable in eWeLink. It is adjusted with a physical dial, and the screen turns on when you approach and off when you leave, thanks to the radar presence sensor. The internal RTC clock keeps schedules running even without Zigbee.
Note: the Thermostat Core is not a gateway; it requires a compatible Zigbee hub, for example SONOFF Bridge-M or eWeLink CUBE. It is not suitable for electric underfloor heating (maximum load is 3A). The NTC floor sensor is not included. The thermostat requires live (L) and neutral (N); installation must be carried out only by a qualified electrician. The Italian 503 wall box requires an adapter (SONOFF provides a 3D printing file).
Features:
- Two outputs: 3A active output for actuators and dry contact for the boiler; NO/NC logic configured in eWeLink
- 3 weekly schedules with up to 12 time slots per day
- Physical dial; the screen turns on when you approach and off when you leave (radar presence sensor), with adjustable brightness
- Temperature taken from an external SONOFF sensor (SNZB-02, -02P, -02D, -02WD, -02LD, -02B, -02M) and Temp Offset
- Dual open window detection: automatic or via SNZB-04 / 04P / 04PR2 connected to the same gateway
- Switches off the boiler when the target temperature is reached; presence-adaptive heating
- Child lock, frost protection, overheat protection via external NTC sensor and 6 months of history
- Works with eWeLink, Apple Home (via Matter Bridge) and Home Assistant (Zigbee2MQTT 2.14.0 or newer)
Practical use cases:
- Water underfloor heating: the thermostat controls the room circuit actuators and keeps the temperature according to the weekly schedule.
- Gas boiler: through the dry contact, the boiler starts only when the room needs heat and stops when the target temperature is reached.
- Living room: heating adapts to presence, and the screen lights up only when you approach the thermostat.
- Airing the room: when the window is opened, detected automatically or by the SNZB-04P sensor, heating no longer runs for nothing.
Technical specifications:
| Model | TP-WGZBA |
| Wireless protocol | Zigbee 3.0 (IEEE 802.15.4) |
| Power supply | 100-240V~ 50/60Hz, max. 3A; live (L) and neutral (N) required |
| Active output | relay for actuators, max. 3A, resistive load |
| Passive output | dry contact for the boiler (COM, NO) |
| Setting range | 5–30 °C |
| Presence sensor | radar, 3 distance levels: ~0.3 m, ~0.6 m, ~1 m |
| Floor sensor input | NTC 10KΩ, B 3950K (sensor not included) |
| Wire size | 0.2–3.5 mm² (24–12 AWG) |
| Dimensions | 86 × 86 × 45.5 mm; in-wall depth 31.5 mm; mounting hole spacing 60 mm |
| Weight | 155 g |
| Operating temperature | 0–50 °C |
| Operating humidity | ≤90% RH, non-condensing |
| Altitude | 2000 m |
| Other data | impulse voltage 4KV, pollution degree II, type of action 1.B, 10,000 cycles |
| Housing | PC, white |
| Certifications | CE, RoHS |
It is the right choice for anyone with water underfloor heating or a boiler who wants a Zigbee thermostat with weekly schedules, presence-based control and a physical dial.