ENGO ETR-868 Wireless Relay Controller 868MHz 230V – No-Wire Zone Control for Pumps, Boilers & Lighting
ENGO ETR-868 Wireless Relay Controller 868MHz 230V – No-Wire Zone Control for Pumps, Boilers & Lighting
The ENGO ETR-868 is a wireless relay kit that solves the problem of missing or impractical cable runs in heating installations. Operating on 868 MHz, it links a 230V transmitter to a mains receiver (up to 300 m in open space) with a 16A volt-free relay output. Factory-paired and ready to use, it eliminates the need to route extra cable between a thermostat, wiring centre, pump, boiler, or control box — making it invaluable for retrofits, extensions, and complex layouts.
Why Choose the ETR-868?
Easily bridges the gap between a manifold, boiler, or pump even through floors and walls in large properties.
Controls pumps, boilers, fan coils, lighting circuits, electric heaters, gates, and other 230V loads up to 16A.
Clean contact relay output — safe for both low-voltage and mains control inputs on any device.
Receiver and transmitter both fit in standard 47 mm flush-mount back boxes or snap onto DIN rail.
Both units arrive ready to use — no pairing procedure required for single-receiver setups.
Built-in capacitor in the transmitter sends an "OFF" command to the receiver if mains power is lost — no stuck-on relay.
Pair additional ETR-868RX receivers to a single transmitter for multi-point control from one signal source.
The perfect answer when wiring is not possible — no chasing, no cable, no disruption to finished rooms.
Suitable For
About the ETR-868
The ETR-868 is a two-part 868 MHz wireless relay system. The transmitter connects to a 230V AC signal source (such as the thermostat output of a wiring centre, a zone valve output, or a light switch output). When the transmitter is powered, it continuously sends a coded signal to the receiver. The receiver activates its 16A volt-free COM/NO relay, supplying or switching the connected load. When the transmitter loses power (zone off, boiler signal off, switch turned off), it uses its built-in super-capacitor to transmit a final "OFF" command, ensuring the receiver returns to its open state immediately.
Missing wiring between thermostat and wiring centre: Mount the transmitter at the thermostat's location (wired to the thermostat's SL output) and the receiver at the wiring centre (connected to the SL zone input) — no cable run needed between the two.
Wiring centre to boiler: Mount the transmitter at the wiring centre (wired to the pump or boiler output) and the receiver at the boiler (connected to the thermostat input) — eliminates a long cable run to a remote boiler.
Wireless pump switch via light switch: Transmitter wired to a lighting circuit; receiver controls the circulation pump — turning the light on activates the pump.
The transmitter continuously repeats its signal while powered. If the receiver loses the signal for any reason (e.g. severe interference), it will return to its OFF (open) state — a fail-safe design that prevents devices from being left running indefinitely.
Key Features
- 868 MHz radio communication — up to 300 m open-space range
- Transmitter: 230V AC powered — activates relay when supplied
- Receiver: 230V AC powered — volt-free COM/NO relay output, 16A max load
- Super-capacitor in transmitter sends "OFF" on power loss
- Unique transmission codes — prevents cross-interference with other devices
- Factory pre-paired transmitter and receiver
- Additional receivers (ETR-868RX) can be paired with the same transmitter
- Receiver and transmitter both fit in flush-mount back box (47 mm depth)
- DIN rail mounting brackets included for panel installation
- LED status indicator on both units
- External "NO contact" input on transmitter for monostable switch override
- 2014/30/EU, 2014/35/EU, 2014/53/EU, 2011/65/EU compliant
Technical Specifications
| Specification | Transmitter (TX) |
|---|---|
| Power Supply | 230V AC / 50Hz |
| RF Frequency | 868 MHz (868.0–868.6 MHz) |
| Range | Up to 300 m (open space) |
| Backup | Super-capacitor — sends OFF on power loss |
| Dimensions (TX) | 46 × 46 × 24 mm |
| Specification | Receiver (RX) |
| Power Supply | 230V AC / 50Hz |
| Output | Volt-free COM/NO relay |
| Max Load | 16(5)A |
| Mounting | Flush box (47 mm) or DIN rail (bracket included) |
| Dimensions (RX) | 46 × 46 × 24 mm |
Installation Notes
Installation must be carried out by a qualified person per BS 7671. Both transmitter and receiver require 230V AC connections.
- Transmitter: connect L and N from the source signal (e.g. zone output on wiring centre, pump output, or switched live)
- Receiver: connect L and N to 230V supply; wire the COM/NO output to the controlled device's input
- Both units arrive pre-paired — no pairing required for a single-receiver setup
- To pair additional ETR-868RX receivers: hold the button on the receiver for 5 seconds to enter pairing mode while the transmitter is running
- Mount away from metal enclosures where possible to maximise RF range
- DIN rail brackets are included — use for panel or consumer unit installation
Frequently Asked Questions
What is the maximum cable-saving distance?
Up to 300 m in open space. In practice, through 2–3 floors and partition walls in a domestic property, reliable operation is typical up to 50–80 m. For very large or heavily shielded buildings, use an ETR-868RX repeater receiver closer to the transmitter to relay the signal further.
Can I control more than one device from a single transmitter?
Yes — pair additional ETR-868RX receivers to the same transmitter. All paired receivers will activate and deactivate simultaneously when the transmitter is powered on and off.
What happens if the signal is interrupted?
The receiver returns to its OFF (relay open) state within seconds of losing the RF signal — a fail-safe behaviour that prevents controlled devices from remaining powered on indefinitely.
Can this replace the missing wire between my thermostat and wiring centre?
Yes — wire the transmitter to the thermostat's SL (switched live) output, and connect the receiver's COM/NO output to the corresponding SL zone input on the wiring centre. This exactly replicates what a direct cable would do.
Does this work with non-ENGO equipment?
Yes — the ETR-868 uses standard 230V inputs and volt-free COM/NO outputs that are compatible with any manufacturer's heating controls, pumps, boilers, or lighting systems.
What's in the Box
- 1× ETR-868 transmitter (TX)
- 1× ETR-868 receiver (RX)
- DIN rail mounting brackets
- Quick installation guide
Note: For additional receiver units, order the ETR-868RX separately.
Installation by qualified person per BS 7671. Both units require 230V AC. Max load 16A. For additional relay receivers see ETR-868RX.
Original: $91.78
-65%$91.78
$32.12More Images
ENGO ETR-868 Wireless Relay Controller 868MHz 230V – No-Wire Zone Control for Pumps, Boilers & Lighting
The ENGO ETR-868 is a wireless relay kit that solves the problem of missing or impractical cable runs in heating installations. Operating on 868 MHz, it links a 230V transmitter to a mains receiver (up to 300 m in open space) with a 16A volt-free relay output. Factory-paired and ready to use, it eliminates the need to route extra cable between a thermostat, wiring centre, pump, boiler, or control box — making it invaluable for retrofits, extensions, and complex layouts.
Why Choose the ETR-868?
Easily bridges the gap between a manifold, boiler, or pump even through floors and walls in large properties.
Controls pumps, boilers, fan coils, lighting circuits, electric heaters, gates, and other 230V loads up to 16A.
Clean contact relay output — safe for both low-voltage and mains control inputs on any device.
Receiver and transmitter both fit in standard 47 mm flush-mount back boxes or snap onto DIN rail.
Both units arrive ready to use — no pairing procedure required for single-receiver setups.
Built-in capacitor in the transmitter sends an "OFF" command to the receiver if mains power is lost — no stuck-on relay.
Pair additional ETR-868RX receivers to a single transmitter for multi-point control from one signal source.
The perfect answer when wiring is not possible — no chasing, no cable, no disruption to finished rooms.
Suitable For
About the ETR-868
The ETR-868 is a two-part 868 MHz wireless relay system. The transmitter connects to a 230V AC signal source (such as the thermostat output of a wiring centre, a zone valve output, or a light switch output). When the transmitter is powered, it continuously sends a coded signal to the receiver. The receiver activates its 16A volt-free COM/NO relay, supplying or switching the connected load. When the transmitter loses power (zone off, boiler signal off, switch turned off), it uses its built-in super-capacitor to transmit a final "OFF" command, ensuring the receiver returns to its open state immediately.
Missing wiring between thermostat and wiring centre: Mount the transmitter at the thermostat's location (wired to the thermostat's SL output) and the receiver at the wiring centre (connected to the SL zone input) — no cable run needed between the two.
Wiring centre to boiler: Mount the transmitter at the wiring centre (wired to the pump or boiler output) and the receiver at the boiler (connected to the thermostat input) — eliminates a long cable run to a remote boiler.
Wireless pump switch via light switch: Transmitter wired to a lighting circuit; receiver controls the circulation pump — turning the light on activates the pump.
The transmitter continuously repeats its signal while powered. If the receiver loses the signal for any reason (e.g. severe interference), it will return to its OFF (open) state — a fail-safe design that prevents devices from being left running indefinitely.
Key Features
- 868 MHz radio communication — up to 300 m open-space range
- Transmitter: 230V AC powered — activates relay when supplied
- Receiver: 230V AC powered — volt-free COM/NO relay output, 16A max load
- Super-capacitor in transmitter sends "OFF" on power loss
- Unique transmission codes — prevents cross-interference with other devices
- Factory pre-paired transmitter and receiver
- Additional receivers (ETR-868RX) can be paired with the same transmitter
- Receiver and transmitter both fit in flush-mount back box (47 mm depth)
- DIN rail mounting brackets included for panel installation
- LED status indicator on both units
- External "NO contact" input on transmitter for monostable switch override
- 2014/30/EU, 2014/35/EU, 2014/53/EU, 2011/65/EU compliant
Technical Specifications
| Specification | Transmitter (TX) |
|---|---|
| Power Supply | 230V AC / 50Hz |
| RF Frequency | 868 MHz (868.0–868.6 MHz) |
| Range | Up to 300 m (open space) |
| Backup | Super-capacitor — sends OFF on power loss |
| Dimensions (TX) | 46 × 46 × 24 mm |
| Specification | Receiver (RX) |
| Power Supply | 230V AC / 50Hz |
| Output | Volt-free COM/NO relay |
| Max Load | 16(5)A |
| Mounting | Flush box (47 mm) or DIN rail (bracket included) |
| Dimensions (RX) | 46 × 46 × 24 mm |
Installation Notes
Installation must be carried out by a qualified person per BS 7671. Both transmitter and receiver require 230V AC connections.
- Transmitter: connect L and N from the source signal (e.g. zone output on wiring centre, pump output, or switched live)
- Receiver: connect L and N to 230V supply; wire the COM/NO output to the controlled device's input
- Both units arrive pre-paired — no pairing required for a single-receiver setup
- To pair additional ETR-868RX receivers: hold the button on the receiver for 5 seconds to enter pairing mode while the transmitter is running
- Mount away from metal enclosures where possible to maximise RF range
- DIN rail brackets are included — use for panel or consumer unit installation
Frequently Asked Questions
What is the maximum cable-saving distance?
Up to 300 m in open space. In practice, through 2–3 floors and partition walls in a domestic property, reliable operation is typical up to 50–80 m. For very large or heavily shielded buildings, use an ETR-868RX repeater receiver closer to the transmitter to relay the signal further.
Can I control more than one device from a single transmitter?
Yes — pair additional ETR-868RX receivers to the same transmitter. All paired receivers will activate and deactivate simultaneously when the transmitter is powered on and off.
What happens if the signal is interrupted?
The receiver returns to its OFF (relay open) state within seconds of losing the RF signal — a fail-safe behaviour that prevents controlled devices from remaining powered on indefinitely.
Can this replace the missing wire between my thermostat and wiring centre?
Yes — wire the transmitter to the thermostat's SL (switched live) output, and connect the receiver's COM/NO output to the corresponding SL zone input on the wiring centre. This exactly replicates what a direct cable would do.
Does this work with non-ENGO equipment?
Yes — the ETR-868 uses standard 230V inputs and volt-free COM/NO outputs that are compatible with any manufacturer's heating controls, pumps, boilers, or lighting systems.
What's in the Box
- 1× ETR-868 transmitter (TX)
- 1× ETR-868 receiver (RX)
- DIN rail mounting brackets
- Quick installation guide
Note: For additional receiver units, order the ETR-868RX separately.
Installation by qualified person per BS 7671. Both units require 230V AC. Max load 16A. For additional relay receivers see ETR-868RX.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The ENGO ETR-868 is a wireless relay kit that solves the problem of missing or impractical cable runs in heating installations. Operating on 868 MHz, it links a 230V transmitter to a mains receiver (up to 300 m in open space) with a 16A volt-free relay output. Factory-paired and ready to use, it eliminates the need to route extra cable between a thermostat, wiring centre, pump, boiler, or control box — making it invaluable for retrofits, extensions, and complex layouts.
Why Choose the ETR-868?
Easily bridges the gap between a manifold, boiler, or pump even through floors and walls in large properties.
Controls pumps, boilers, fan coils, lighting circuits, electric heaters, gates, and other 230V loads up to 16A.
Clean contact relay output — safe for both low-voltage and mains control inputs on any device.
Receiver and transmitter both fit in standard 47 mm flush-mount back boxes or snap onto DIN rail.
Both units arrive ready to use — no pairing procedure required for single-receiver setups.
Built-in capacitor in the transmitter sends an "OFF" command to the receiver if mains power is lost — no stuck-on relay.
Pair additional ETR-868RX receivers to a single transmitter for multi-point control from one signal source.
The perfect answer when wiring is not possible — no chasing, no cable, no disruption to finished rooms.
Suitable For
About the ETR-868
The ETR-868 is a two-part 868 MHz wireless relay system. The transmitter connects to a 230V AC signal source (such as the thermostat output of a wiring centre, a zone valve output, or a light switch output). When the transmitter is powered, it continuously sends a coded signal to the receiver. The receiver activates its 16A volt-free COM/NO relay, supplying or switching the connected load. When the transmitter loses power (zone off, boiler signal off, switch turned off), it uses its built-in super-capacitor to transmit a final "OFF" command, ensuring the receiver returns to its open state immediately.
Missing wiring between thermostat and wiring centre: Mount the transmitter at the thermostat's location (wired to the thermostat's SL output) and the receiver at the wiring centre (connected to the SL zone input) — no cable run needed between the two.
Wiring centre to boiler: Mount the transmitter at the wiring centre (wired to the pump or boiler output) and the receiver at the boiler (connected to the thermostat input) — eliminates a long cable run to a remote boiler.
Wireless pump switch via light switch: Transmitter wired to a lighting circuit; receiver controls the circulation pump — turning the light on activates the pump.
The transmitter continuously repeats its signal while powered. If the receiver loses the signal for any reason (e.g. severe interference), it will return to its OFF (open) state — a fail-safe design that prevents devices from being left running indefinitely.
Key Features
- 868 MHz radio communication — up to 300 m open-space range
- Transmitter: 230V AC powered — activates relay when supplied
- Receiver: 230V AC powered — volt-free COM/NO relay output, 16A max load
- Super-capacitor in transmitter sends "OFF" on power loss
- Unique transmission codes — prevents cross-interference with other devices
- Factory pre-paired transmitter and receiver
- Additional receivers (ETR-868RX) can be paired with the same transmitter
- Receiver and transmitter both fit in flush-mount back box (47 mm depth)
- DIN rail mounting brackets included for panel installation
- LED status indicator on both units
- External "NO contact" input on transmitter for monostable switch override
- 2014/30/EU, 2014/35/EU, 2014/53/EU, 2011/65/EU compliant
Technical Specifications
| Specification | Transmitter (TX) |
|---|---|
| Power Supply | 230V AC / 50Hz |
| RF Frequency | 868 MHz (868.0–868.6 MHz) |
| Range | Up to 300 m (open space) |
| Backup | Super-capacitor — sends OFF on power loss |
| Dimensions (TX) | 46 × 46 × 24 mm |
| Specification | Receiver (RX) |
| Power Supply | 230V AC / 50Hz |
| Output | Volt-free COM/NO relay |
| Max Load | 16(5)A |
| Mounting | Flush box (47 mm) or DIN rail (bracket included) |
| Dimensions (RX) | 46 × 46 × 24 mm |
Installation Notes
Installation must be carried out by a qualified person per BS 7671. Both transmitter and receiver require 230V AC connections.
- Transmitter: connect L and N from the source signal (e.g. zone output on wiring centre, pump output, or switched live)
- Receiver: connect L and N to 230V supply; wire the COM/NO output to the controlled device's input
- Both units arrive pre-paired — no pairing required for a single-receiver setup
- To pair additional ETR-868RX receivers: hold the button on the receiver for 5 seconds to enter pairing mode while the transmitter is running
- Mount away from metal enclosures where possible to maximise RF range
- DIN rail brackets are included — use for panel or consumer unit installation
Frequently Asked Questions
What is the maximum cable-saving distance?
Up to 300 m in open space. In practice, through 2–3 floors and partition walls in a domestic property, reliable operation is typical up to 50–80 m. For very large or heavily shielded buildings, use an ETR-868RX repeater receiver closer to the transmitter to relay the signal further.
Can I control more than one device from a single transmitter?
Yes — pair additional ETR-868RX receivers to the same transmitter. All paired receivers will activate and deactivate simultaneously when the transmitter is powered on and off.
What happens if the signal is interrupted?
The receiver returns to its OFF (relay open) state within seconds of losing the RF signal — a fail-safe behaviour that prevents controlled devices from remaining powered on indefinitely.
Can this replace the missing wire between my thermostat and wiring centre?
Yes — wire the transmitter to the thermostat's SL (switched live) output, and connect the receiver's COM/NO output to the corresponding SL zone input on the wiring centre. This exactly replicates what a direct cable would do.
Does this work with non-ENGO equipment?
Yes — the ETR-868 uses standard 230V inputs and volt-free COM/NO outputs that are compatible with any manufacturer's heating controls, pumps, boilers, or lighting systems.
What's in the Box
- 1× ETR-868 transmitter (TX)
- 1× ETR-868 receiver (RX)
- DIN rail mounting brackets
- Quick installation guide
Note: For additional receiver units, order the ETR-868RX separately.
Installation by qualified person per BS 7671. Both units require 230V AC. Max load 16A. For additional relay receivers see ETR-868RX.
