ENGO EREL-16ZB ZigBee Smart Relay 1×16A – Wireless Boiler, Pump & Lighting Control
The ENGO EREL-16ZB is a ZigBee 3.0 smart relay module that provides wireless on/off control of 230V loads up to 16A — all from the ENGO Smart app, Alexa, or Google Assistant. Housed in a compact flush-box or DIN rail enclosure, it acts as a smart boiler relay, pump switch, lighting controller, or general automation module. It stores programmed rules and continues to operate offline — and accepts an optional EFS300 temperature sensor for advanced temperature-triggered automation.
Why Choose the ENGO EREL-16ZB?
Stable, low-power wireless mesh — works with EGATE-PRO gateway for cloud control or standalone in offline mode with saved rules.
High-capacity relay handles boilers, immersion heaters, pumps, lighting circuits, fans, and gate motors.
Clean contact output — drives any device requiring a potential-free signal, including boiler thermostat inputs.
Saved rules and schedules run without internet — rules execute even when broadband is down.
Connect an optional EFS300 temperature sensor (S1/S2 terminals) for temperature-triggered rules — ideal for hot water cylinder or pipe frost protection.
Full remote control via ENGO Smart app, Amazon Alexa, and Google Assistant — requires EGATE-PRO gateway.
Fits in a standard UK 47 mm flush-mount back box (behind a socket or switch plate) or mounts on DIN rail — flexible installation.
Binds directly with ENGO ZigBee thermostats for offline thermostat-to-relay control, even without internet.
Suitable For
About the EREL-16ZB
The EREL-16ZB is a ZigBee 3.0 relay module that can be hidden inside a standard flush-mount back box (behind a socket or light switch faceplate) or installed on a DIN rail in a consumer unit or manifold cabinet. It requires a ZigBee gateway (EGATE-PRO or EGATEZB) to access cloud features, but it also stores rules locally and operates fully offline — critical for heating applications where reliable operation cannot depend solely on internet connectivity.
The S1/S2 contacts on the EREL-16ZB accept the optional ENGO EFS300 external temperature sensor. Once connected, the sensor's reading appears in the ENGO Smart app, and you can create rules such as "switch the relay ON when the sensor temperature drops below 5°C" — ideal for pipe frost protection, hot water cylinder boost, or controlling equipment based on ambient temperature in a remote location such as a loft, garage, or outbuilding.
The ENGO Binding function allows the relay to be directly linked with ENGO ZigBee thermostats (EONE or E25 series) without the gateway acting as the intermediary. This means the relay will respond to the thermostat's heat demand signal even when there is no internet connection and the gateway is offline — a robust fail-safe for heating control applications.
The EREL-16ZB must be added to an ENGO ZigBee gateway (EGATE-PRO or EGATEZB, sold separately) to enable app control, scheduling via the cloud, and voice assistant commands. Without a gateway, the relay can still operate via ENGO Binding with a compatible thermostat, using its locally stored rules.
Key Features
- ZigBee 3.0 wireless communication (2.4 GHz)
- Volt-free COM/NO relay output — 16A maximum load
- 230V AC 50Hz power supply
- Works offline — stores and executes rules without internet
- EFS300 temperature sensor input (S1/S2 terminals) — −40°C to 120°C range
- ENGO Binding — direct offline thermostat-to-relay control
- ENGO Smart app control (requires EGATE-PRO or EGATEZB gateway)
- Amazon Alexa and Google Assistant voice control (requires gateway)
- Tuya Smart and SmartLife compatible
- Supports bistable switch or monostable pushbutton local control
- Flush-mount back box installation (47 mm depth)
- DIN rail mounting bracket included
- LED status indicator
- Factory reset via 8-second button hold
- Compliant: 2014/30/EU, 2014/35/EU, 2014/53/EU, 2011/65/EU
Technical Specifications
| Specification | Value |
|---|---|
| Model | EREL-16ZB |
| Communication | ZigBee 3.0, 2.4 GHz |
| Power Supply | 230V AC / 50Hz |
| Max Load | 16A |
| Output | Volt-free COM/NO relay |
| Sensor Input (S1/S2) | EFS300 temperature sensor or volt-free contact |
| Sensor Temp. Range | −40°C to 120°C (with EFS300) |
| Offline Operation | Yes — stored rules execute without internet |
| Mounting | Flush box (47 mm) or DIN rail (bracket included) |
| App | ENGO Smart (Tuya Cloud), Tuya Smart, SmartLife |
| Voice Control | Amazon Alexa, Google Assistant (requires gateway) |
| Gateway Required | Yes — EGATE-PRO or EGATEZB (sold separately) |
| Warranty | 5 years |
Installation Notes
Installation must be carried out by a qualified person per BS 7671. The relay operates at 230V and must be correctly fused within the circuit.
- Connect L and N (230V supply) and the COM/NO output to the controlled device's input
- Connect optional EFS300 sensor to S1/S2 terminals; activate temperature sensor mode in the app settings
- Red LED flashing quickly on power-up: relay is in pairing mode — add to gateway via ENGO Smart app
- Hold button for 8 seconds to reset (red LED flashes): relay returns to pairing mode
- For ENGO Binding with a thermostat: both devices must be on the same ZigBee network; press the relay button 5 times quickly to enter binding mode
- When bound to a thermostat, the relay will switch off after 50 minutes if communication is lost — fail-safe behaviour
Frequently Asked Questions
Do I need the gateway for this to work?
You need the gateway for app control, remote access, cloud scheduling, and voice commands. However, if you use ENGO Binding with a compatible thermostat, the relay will operate offline without the gateway, executing locally stored rules.
Can I use this to control my boiler?
Yes — the volt-free COM/NO output is compatible with the thermostat input on any standard UK boiler. Wire the output to the boiler's T/T or thermostat terminals.
Can I use this with a temperature sensor?
Yes — connect an ENGO EFS300 sensor to the S1/S2 terminals and activate it in the app settings. The sensor reading becomes available for creating temperature-based automation rules.
Will it fit behind a standard UK socket?
Yes — the compact dimensions allow installation inside a 47 mm deep flush back box, hidden behind a standard UK socket or switch faceplate.
Is it compatible with third-party ZigBee devices?
The EREL-16ZB is designed for use within the ENGO Smart / Tuya ecosystem. It may be compatible with other Tuya-based ZigBee 3.0 gateways, but full functionality is only guaranteed with ENGO gateways.
What's in the Box
- 1× EREL-16ZB ZigBee smart relay module
- DIN rail mounting bracket
- Quick installation guide
Note: EGATE-PRO or EGATEZB gateway sold separately. EFS300 temperature sensor sold separately.
Requires ENGO ZigBee gateway for app and voice control. Installation by qualified person per BS 7671. Max load 16A. Temperature sensor (EFS300) sold separately.
Original: $45.89
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ENGO EREL-16ZB ZigBee Smart Relay 1×16A – Wireless Boiler, Pump & Lighting Control
The ENGO EREL-16ZB is a ZigBee 3.0 smart relay module that provides wireless on/off control of 230V loads up to 16A — all from the ENGO Smart app, Alexa, or Google Assistant. Housed in a compact flush-box or DIN rail enclosure, it acts as a smart boiler relay, pump switch, lighting controller, or general automation module. It stores programmed rules and continues to operate offline — and accepts an optional EFS300 temperature sensor for advanced temperature-triggered automation.
Why Choose the ENGO EREL-16ZB?
Stable, low-power wireless mesh — works with EGATE-PRO gateway for cloud control or standalone in offline mode with saved rules.
High-capacity relay handles boilers, immersion heaters, pumps, lighting circuits, fans, and gate motors.
Clean contact output — drives any device requiring a potential-free signal, including boiler thermostat inputs.
Saved rules and schedules run without internet — rules execute even when broadband is down.
Connect an optional EFS300 temperature sensor (S1/S2 terminals) for temperature-triggered rules — ideal for hot water cylinder or pipe frost protection.
Full remote control via ENGO Smart app, Amazon Alexa, and Google Assistant — requires EGATE-PRO gateway.
Fits in a standard UK 47 mm flush-mount back box (behind a socket or switch plate) or mounts on DIN rail — flexible installation.
Binds directly with ENGO ZigBee thermostats for offline thermostat-to-relay control, even without internet.
Suitable For
About the EREL-16ZB
The EREL-16ZB is a ZigBee 3.0 relay module that can be hidden inside a standard flush-mount back box (behind a socket or light switch faceplate) or installed on a DIN rail in a consumer unit or manifold cabinet. It requires a ZigBee gateway (EGATE-PRO or EGATEZB) to access cloud features, but it also stores rules locally and operates fully offline — critical for heating applications where reliable operation cannot depend solely on internet connectivity.
The S1/S2 contacts on the EREL-16ZB accept the optional ENGO EFS300 external temperature sensor. Once connected, the sensor's reading appears in the ENGO Smart app, and you can create rules such as "switch the relay ON when the sensor temperature drops below 5°C" — ideal for pipe frost protection, hot water cylinder boost, or controlling equipment based on ambient temperature in a remote location such as a loft, garage, or outbuilding.
The ENGO Binding function allows the relay to be directly linked with ENGO ZigBee thermostats (EONE or E25 series) without the gateway acting as the intermediary. This means the relay will respond to the thermostat's heat demand signal even when there is no internet connection and the gateway is offline — a robust fail-safe for heating control applications.
The EREL-16ZB must be added to an ENGO ZigBee gateway (EGATE-PRO or EGATEZB, sold separately) to enable app control, scheduling via the cloud, and voice assistant commands. Without a gateway, the relay can still operate via ENGO Binding with a compatible thermostat, using its locally stored rules.
Key Features
- ZigBee 3.0 wireless communication (2.4 GHz)
- Volt-free COM/NO relay output — 16A maximum load
- 230V AC 50Hz power supply
- Works offline — stores and executes rules without internet
- EFS300 temperature sensor input (S1/S2 terminals) — −40°C to 120°C range
- ENGO Binding — direct offline thermostat-to-relay control
- ENGO Smart app control (requires EGATE-PRO or EGATEZB gateway)
- Amazon Alexa and Google Assistant voice control (requires gateway)
- Tuya Smart and SmartLife compatible
- Supports bistable switch or monostable pushbutton local control
- Flush-mount back box installation (47 mm depth)
- DIN rail mounting bracket included
- LED status indicator
- Factory reset via 8-second button hold
- Compliant: 2014/30/EU, 2014/35/EU, 2014/53/EU, 2011/65/EU
Technical Specifications
| Specification | Value |
|---|---|
| Model | EREL-16ZB |
| Communication | ZigBee 3.0, 2.4 GHz |
| Power Supply | 230V AC / 50Hz |
| Max Load | 16A |
| Output | Volt-free COM/NO relay |
| Sensor Input (S1/S2) | EFS300 temperature sensor or volt-free contact |
| Sensor Temp. Range | −40°C to 120°C (with EFS300) |
| Offline Operation | Yes — stored rules execute without internet |
| Mounting | Flush box (47 mm) or DIN rail (bracket included) |
| App | ENGO Smart (Tuya Cloud), Tuya Smart, SmartLife |
| Voice Control | Amazon Alexa, Google Assistant (requires gateway) |
| Gateway Required | Yes — EGATE-PRO or EGATEZB (sold separately) |
| Warranty | 5 years |
Installation Notes
Installation must be carried out by a qualified person per BS 7671. The relay operates at 230V and must be correctly fused within the circuit.
- Connect L and N (230V supply) and the COM/NO output to the controlled device's input
- Connect optional EFS300 sensor to S1/S2 terminals; activate temperature sensor mode in the app settings
- Red LED flashing quickly on power-up: relay is in pairing mode — add to gateway via ENGO Smart app
- Hold button for 8 seconds to reset (red LED flashes): relay returns to pairing mode
- For ENGO Binding with a thermostat: both devices must be on the same ZigBee network; press the relay button 5 times quickly to enter binding mode
- When bound to a thermostat, the relay will switch off after 50 minutes if communication is lost — fail-safe behaviour
Frequently Asked Questions
Do I need the gateway for this to work?
You need the gateway for app control, remote access, cloud scheduling, and voice commands. However, if you use ENGO Binding with a compatible thermostat, the relay will operate offline without the gateway, executing locally stored rules.
Can I use this to control my boiler?
Yes — the volt-free COM/NO output is compatible with the thermostat input on any standard UK boiler. Wire the output to the boiler's T/T or thermostat terminals.
Can I use this with a temperature sensor?
Yes — connect an ENGO EFS300 sensor to the S1/S2 terminals and activate it in the app settings. The sensor reading becomes available for creating temperature-based automation rules.
Will it fit behind a standard UK socket?
Yes — the compact dimensions allow installation inside a 47 mm deep flush back box, hidden behind a standard UK socket or switch faceplate.
Is it compatible with third-party ZigBee devices?
The EREL-16ZB is designed for use within the ENGO Smart / Tuya ecosystem. It may be compatible with other Tuya-based ZigBee 3.0 gateways, but full functionality is only guaranteed with ENGO gateways.
What's in the Box
- 1× EREL-16ZB ZigBee smart relay module
- DIN rail mounting bracket
- Quick installation guide
Note: EGATE-PRO or EGATEZB gateway sold separately. EFS300 temperature sensor sold separately.
Requires ENGO ZigBee gateway for app and voice control. Installation by qualified person per BS 7671. Max load 16A. Temperature sensor (EFS300) sold separately.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The ENGO EREL-16ZB is a ZigBee 3.0 smart relay module that provides wireless on/off control of 230V loads up to 16A — all from the ENGO Smart app, Alexa, or Google Assistant. Housed in a compact flush-box or DIN rail enclosure, it acts as a smart boiler relay, pump switch, lighting controller, or general automation module. It stores programmed rules and continues to operate offline — and accepts an optional EFS300 temperature sensor for advanced temperature-triggered automation.
Why Choose the ENGO EREL-16ZB?
Stable, low-power wireless mesh — works with EGATE-PRO gateway for cloud control or standalone in offline mode with saved rules.
High-capacity relay handles boilers, immersion heaters, pumps, lighting circuits, fans, and gate motors.
Clean contact output — drives any device requiring a potential-free signal, including boiler thermostat inputs.
Saved rules and schedules run without internet — rules execute even when broadband is down.
Connect an optional EFS300 temperature sensor (S1/S2 terminals) for temperature-triggered rules — ideal for hot water cylinder or pipe frost protection.
Full remote control via ENGO Smart app, Amazon Alexa, and Google Assistant — requires EGATE-PRO gateway.
Fits in a standard UK 47 mm flush-mount back box (behind a socket or switch plate) or mounts on DIN rail — flexible installation.
Binds directly with ENGO ZigBee thermostats for offline thermostat-to-relay control, even without internet.
Suitable For
About the EREL-16ZB
The EREL-16ZB is a ZigBee 3.0 relay module that can be hidden inside a standard flush-mount back box (behind a socket or light switch faceplate) or installed on a DIN rail in a consumer unit or manifold cabinet. It requires a ZigBee gateway (EGATE-PRO or EGATEZB) to access cloud features, but it also stores rules locally and operates fully offline — critical for heating applications where reliable operation cannot depend solely on internet connectivity.
The S1/S2 contacts on the EREL-16ZB accept the optional ENGO EFS300 external temperature sensor. Once connected, the sensor's reading appears in the ENGO Smart app, and you can create rules such as "switch the relay ON when the sensor temperature drops below 5°C" — ideal for pipe frost protection, hot water cylinder boost, or controlling equipment based on ambient temperature in a remote location such as a loft, garage, or outbuilding.
The ENGO Binding function allows the relay to be directly linked with ENGO ZigBee thermostats (EONE or E25 series) without the gateway acting as the intermediary. This means the relay will respond to the thermostat's heat demand signal even when there is no internet connection and the gateway is offline — a robust fail-safe for heating control applications.
The EREL-16ZB must be added to an ENGO ZigBee gateway (EGATE-PRO or EGATEZB, sold separately) to enable app control, scheduling via the cloud, and voice assistant commands. Without a gateway, the relay can still operate via ENGO Binding with a compatible thermostat, using its locally stored rules.
Key Features
- ZigBee 3.0 wireless communication (2.4 GHz)
- Volt-free COM/NO relay output — 16A maximum load
- 230V AC 50Hz power supply
- Works offline — stores and executes rules without internet
- EFS300 temperature sensor input (S1/S2 terminals) — −40°C to 120°C range
- ENGO Binding — direct offline thermostat-to-relay control
- ENGO Smart app control (requires EGATE-PRO or EGATEZB gateway)
- Amazon Alexa and Google Assistant voice control (requires gateway)
- Tuya Smart and SmartLife compatible
- Supports bistable switch or monostable pushbutton local control
- Flush-mount back box installation (47 mm depth)
- DIN rail mounting bracket included
- LED status indicator
- Factory reset via 8-second button hold
- Compliant: 2014/30/EU, 2014/35/EU, 2014/53/EU, 2011/65/EU
Technical Specifications
| Specification | Value |
|---|---|
| Model | EREL-16ZB |
| Communication | ZigBee 3.0, 2.4 GHz |
| Power Supply | 230V AC / 50Hz |
| Max Load | 16A |
| Output | Volt-free COM/NO relay |
| Sensor Input (S1/S2) | EFS300 temperature sensor or volt-free contact |
| Sensor Temp. Range | −40°C to 120°C (with EFS300) |
| Offline Operation | Yes — stored rules execute without internet |
| Mounting | Flush box (47 mm) or DIN rail (bracket included) |
| App | ENGO Smart (Tuya Cloud), Tuya Smart, SmartLife |
| Voice Control | Amazon Alexa, Google Assistant (requires gateway) |
| Gateway Required | Yes — EGATE-PRO or EGATEZB (sold separately) |
| Warranty | 5 years |
Installation Notes
Installation must be carried out by a qualified person per BS 7671. The relay operates at 230V and must be correctly fused within the circuit.
- Connect L and N (230V supply) and the COM/NO output to the controlled device's input
- Connect optional EFS300 sensor to S1/S2 terminals; activate temperature sensor mode in the app settings
- Red LED flashing quickly on power-up: relay is in pairing mode — add to gateway via ENGO Smart app
- Hold button for 8 seconds to reset (red LED flashes): relay returns to pairing mode
- For ENGO Binding with a thermostat: both devices must be on the same ZigBee network; press the relay button 5 times quickly to enter binding mode
- When bound to a thermostat, the relay will switch off after 50 minutes if communication is lost — fail-safe behaviour
Frequently Asked Questions
Do I need the gateway for this to work?
You need the gateway for app control, remote access, cloud scheduling, and voice commands. However, if you use ENGO Binding with a compatible thermostat, the relay will operate offline without the gateway, executing locally stored rules.
Can I use this to control my boiler?
Yes — the volt-free COM/NO output is compatible with the thermostat input on any standard UK boiler. Wire the output to the boiler's T/T or thermostat terminals.
Can I use this with a temperature sensor?
Yes — connect an ENGO EFS300 sensor to the S1/S2 terminals and activate it in the app settings. The sensor reading becomes available for creating temperature-based automation rules.
Will it fit behind a standard UK socket?
Yes — the compact dimensions allow installation inside a 47 mm deep flush back box, hidden behind a standard UK socket or switch faceplate.
Is it compatible with third-party ZigBee devices?
The EREL-16ZB is designed for use within the ENGO Smart / Tuya ecosystem. It may be compatible with other Tuya-based ZigBee 3.0 gateways, but full functionality is only guaranteed with ENGO gateways.
What's in the Box
- 1× EREL-16ZB ZigBee smart relay module
- DIN rail mounting bracket
- Quick installation guide
Note: EGATE-PRO or EGATEZB gateway sold separately. EFS300 temperature sensor sold separately.
Requires ENGO ZigBee gateway for app and voice control. Installation by qualified person per BS 7671. Max load 16A. Temperature sensor (EFS300) sold separately.
