ENGO EHW-B WiFi Hot Water Timer with Built-In Thermostat – Programmable DHW Controller | Black
ENGO EHW-B WiFi Hot Water Timer with Built-In Thermostat – Programmable DHW Controller | Black
The ENGO EHW-B is a WiFi-enabled programmable timer and built-in thermostat for domestic hot water (DHW) heaters — in a sleek matt black finish. It lets you schedule exactly when your water heater runs, control it remotely via the ENGO Smart app, and use its built-in thermostat to maintain the target water temperature — saving energy without sacrificing comfort. Compatible with most electric water heaters and immersion cylinders. No hub required.
Why Choose the ENGO EHW-B?
Control, schedule, and monitor your water heater remotely from anywhere in the world — iOS and Android.
Set precise times for the heater to run — only heat water when you actually need it, reducing electricity bills.
Maintains your target water temperature with adjustable hysteresis (±1°C to ±20°C) — no separate thermostat needed.
2.4 GHz WiFi built in — connects directly to your home network. No gateway or bridge device required.
Avoid heating water during peak tariff hours — programme to run on off-peak Economy 7 or Octopus Go overnight rates.
S1/COM input accepts an external temperature sensor or a volt-free contact for advanced control scenarios.
Contemporary dark finish blends with modern kitchen, utility, and bathroom interiors. White version (EHW-W) also available.
Clear display and straightforward programming directly on the device — no app required for basic operation.
Suitable For
About the EHW-B
The EHW-B replaces or supplements a standard hot water timer or immersion heater controller. It mounts on the wall near the water heater and wires to the heater's mains supply via its built-in relay. Its 230V COM/NO/NC relay output (rated 5(2)A) switches the heater according to the programmed schedule and thermostat setpoint.
If you're on an Economy 7, Octopus Go, or other time-of-use electricity tariff, the EHW-B makes it simple to schedule your water heater to run exclusively during cheap-rate hours — typically overnight between 00:30 and 07:30. Set the schedule once in the app and the heater will automatically exploit your cheapest electricity without any manual intervention.
The built-in thermostat monitors water temperature using the S1/COM input, which accepts an NTC temperature sensor (such as a clip-on or immersion probe) or a volt-free contact from an existing thermostat. The hysteresis band is adjustable from ±1°C to ±20°C, giving flexible control suited to everything from precise temperature maintenance to simple bang-bang switching.
The EHW's built-in relay is rated 5(2)A — suitable for directly switching low-power water heaters or signal circuits. For controlling higher-current immersion heaters or boiler loads, the EHW should be wired to a 16A contactor or external relay, with the EHW's output controlling the contactor coil.
Key Features
- WiFi 2.4 GHz built in — no hub or gateway required
- ENGO Smart app control (iOS & Android, Tuya Cloud)
- Programmable timer — set operating hours and heating schedule
- Built-in thermostat with adjustable hysteresis (±1°C to ±20°C)
- Display temperature accuracy: 0.5°C
- Relay output: NO/COM/NC, rated 5(2)A at 230V
- S1/COM input: NTC temperature sensor or volt-free contact
- 230V AC 50Hz power supply
- Energy savings — avoids unnecessary heating
- Intuitive onboard control panel and display
- Matt black finish (see EHW-W for white)
- Compact 90 × 90 × 44 mm housing
- Wall mount installation
Technical Specifications
| Specification | Value |
|---|---|
| Model | EHW-B |
| Colour | Matt Black |
| Power Supply | 230V AC / 50Hz |
| Communication | Wi-Fi 2.4 GHz (no hub required) |
| App | ENGO Smart (Tuya Cloud) — iOS & Android |
| Relay Output | NO/COM/NC, 5(2)A at 230V AC |
| Sensor/Input (S1/COM) | NTC temperature sensor or volt-free contact |
| Control Algorithm | Hysteresis (±1°C to ±20°C) |
| Display Accuracy | 0.5°C |
| Dimensions | 90 × 90 × 44 mm |
| Mounting | Wall mount |
Installation Notes
Installation must be carried out by a qualified person per BS 7671. Ensure the relay output rating is appropriate for the load being switched — use an external contactor for loads exceeding 5A.
- Wire 230V L and N to the power supply terminals
- Connect the NO/COM output to the heater's mains supply (for loads up to 5A direct; use a contactor for larger loads)
- Connect an NTC temperature sensor to S1/COM for thermostat operation, or a volt-free contact for ON/OFF override
- Wi-Fi setup: 2.4 GHz only — ensure your phone is on 2.4 GHz during app setup
- Programme schedule and setpoints directly on the device or via the ENGO Smart app
Frequently Asked Questions
Can this control a standard immersion heater?
Yes, but most immersion heaters draw 3kW (approx. 13A) which exceeds the relay's 5A rating. Wire the EHW's relay output to a 16A contactor coil, and let the contactor switch the immersion heater directly. The EHW controls the contactor; the contactor controls the heater.
Do I need an app to use this?
No — the EHW can be programmed and operated directly using the onboard control panel and display. The app adds convenience (remote access, scheduling from anywhere) but is not required for basic operation.
Does it work with any water heater?
It is compatible with most electric water heaters and immersion cylinder systems that accept on/off switching control. It is not suitable for gas boiler hot water circuits (which use a different control method) or combi boilers.
Is there a white version?
Yes — the EHW-W is identical in specification and features but finished in white. See the EHW-W listing.
Does the built-in thermostat need a separate sensor?
Yes — the thermostat function requires an external NTC temperature sensor connected to the S1/COM terminals. Without a sensor, only timer-based on/off control is available.
What's in the Box
- 1× EHW-B WiFi hot water timer (matt black)
- Wall mounting fixings
- Quick installation guide
Note: NTC temperature sensor sold separately. For the white version see EHW-W.
Installation by qualified person per BS 7671. Relay rated 5(2)A — use external contactor for loads exceeding 5A. 2.4 GHz Wi-Fi only. White version available: EHW-W.
Original: $101.23
-65%$101.23
$35.43More Images
ENGO EHW-B WiFi Hot Water Timer with Built-In Thermostat – Programmable DHW Controller | Black
The ENGO EHW-B is a WiFi-enabled programmable timer and built-in thermostat for domestic hot water (DHW) heaters — in a sleek matt black finish. It lets you schedule exactly when your water heater runs, control it remotely via the ENGO Smart app, and use its built-in thermostat to maintain the target water temperature — saving energy without sacrificing comfort. Compatible with most electric water heaters and immersion cylinders. No hub required.
Why Choose the ENGO EHW-B?
Control, schedule, and monitor your water heater remotely from anywhere in the world — iOS and Android.
Set precise times for the heater to run — only heat water when you actually need it, reducing electricity bills.
Maintains your target water temperature with adjustable hysteresis (±1°C to ±20°C) — no separate thermostat needed.
2.4 GHz WiFi built in — connects directly to your home network. No gateway or bridge device required.
Avoid heating water during peak tariff hours — programme to run on off-peak Economy 7 or Octopus Go overnight rates.
S1/COM input accepts an external temperature sensor or a volt-free contact for advanced control scenarios.
Contemporary dark finish blends with modern kitchen, utility, and bathroom interiors. White version (EHW-W) also available.
Clear display and straightforward programming directly on the device — no app required for basic operation.
Suitable For
About the EHW-B
The EHW-B replaces or supplements a standard hot water timer or immersion heater controller. It mounts on the wall near the water heater and wires to the heater's mains supply via its built-in relay. Its 230V COM/NO/NC relay output (rated 5(2)A) switches the heater according to the programmed schedule and thermostat setpoint.
If you're on an Economy 7, Octopus Go, or other time-of-use electricity tariff, the EHW-B makes it simple to schedule your water heater to run exclusively during cheap-rate hours — typically overnight between 00:30 and 07:30. Set the schedule once in the app and the heater will automatically exploit your cheapest electricity without any manual intervention.
The built-in thermostat monitors water temperature using the S1/COM input, which accepts an NTC temperature sensor (such as a clip-on or immersion probe) or a volt-free contact from an existing thermostat. The hysteresis band is adjustable from ±1°C to ±20°C, giving flexible control suited to everything from precise temperature maintenance to simple bang-bang switching.
The EHW's built-in relay is rated 5(2)A — suitable for directly switching low-power water heaters or signal circuits. For controlling higher-current immersion heaters or boiler loads, the EHW should be wired to a 16A contactor or external relay, with the EHW's output controlling the contactor coil.
Key Features
- WiFi 2.4 GHz built in — no hub or gateway required
- ENGO Smart app control (iOS & Android, Tuya Cloud)
- Programmable timer — set operating hours and heating schedule
- Built-in thermostat with adjustable hysteresis (±1°C to ±20°C)
- Display temperature accuracy: 0.5°C
- Relay output: NO/COM/NC, rated 5(2)A at 230V
- S1/COM input: NTC temperature sensor or volt-free contact
- 230V AC 50Hz power supply
- Energy savings — avoids unnecessary heating
- Intuitive onboard control panel and display
- Matt black finish (see EHW-W for white)
- Compact 90 × 90 × 44 mm housing
- Wall mount installation
Technical Specifications
| Specification | Value |
|---|---|
| Model | EHW-B |
| Colour | Matt Black |
| Power Supply | 230V AC / 50Hz |
| Communication | Wi-Fi 2.4 GHz (no hub required) |
| App | ENGO Smart (Tuya Cloud) — iOS & Android |
| Relay Output | NO/COM/NC, 5(2)A at 230V AC |
| Sensor/Input (S1/COM) | NTC temperature sensor or volt-free contact |
| Control Algorithm | Hysteresis (±1°C to ±20°C) |
| Display Accuracy | 0.5°C |
| Dimensions | 90 × 90 × 44 mm |
| Mounting | Wall mount |
Installation Notes
Installation must be carried out by a qualified person per BS 7671. Ensure the relay output rating is appropriate for the load being switched — use an external contactor for loads exceeding 5A.
- Wire 230V L and N to the power supply terminals
- Connect the NO/COM output to the heater's mains supply (for loads up to 5A direct; use a contactor for larger loads)
- Connect an NTC temperature sensor to S1/COM for thermostat operation, or a volt-free contact for ON/OFF override
- Wi-Fi setup: 2.4 GHz only — ensure your phone is on 2.4 GHz during app setup
- Programme schedule and setpoints directly on the device or via the ENGO Smart app
Frequently Asked Questions
Can this control a standard immersion heater?
Yes, but most immersion heaters draw 3kW (approx. 13A) which exceeds the relay's 5A rating. Wire the EHW's relay output to a 16A contactor coil, and let the contactor switch the immersion heater directly. The EHW controls the contactor; the contactor controls the heater.
Do I need an app to use this?
No — the EHW can be programmed and operated directly using the onboard control panel and display. The app adds convenience (remote access, scheduling from anywhere) but is not required for basic operation.
Does it work with any water heater?
It is compatible with most electric water heaters and immersion cylinder systems that accept on/off switching control. It is not suitable for gas boiler hot water circuits (which use a different control method) or combi boilers.
Is there a white version?
Yes — the EHW-W is identical in specification and features but finished in white. See the EHW-W listing.
Does the built-in thermostat need a separate sensor?
Yes — the thermostat function requires an external NTC temperature sensor connected to the S1/COM terminals. Without a sensor, only timer-based on/off control is available.
What's in the Box
- 1× EHW-B WiFi hot water timer (matt black)
- Wall mounting fixings
- Quick installation guide
Note: NTC temperature sensor sold separately. For the white version see EHW-W.
Installation by qualified person per BS 7671. Relay rated 5(2)A — use external contactor for loads exceeding 5A. 2.4 GHz Wi-Fi only. White version available: EHW-W.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The ENGO EHW-B is a WiFi-enabled programmable timer and built-in thermostat for domestic hot water (DHW) heaters — in a sleek matt black finish. It lets you schedule exactly when your water heater runs, control it remotely via the ENGO Smart app, and use its built-in thermostat to maintain the target water temperature — saving energy without sacrificing comfort. Compatible with most electric water heaters and immersion cylinders. No hub required.
Why Choose the ENGO EHW-B?
Control, schedule, and monitor your water heater remotely from anywhere in the world — iOS and Android.
Set precise times for the heater to run — only heat water when you actually need it, reducing electricity bills.
Maintains your target water temperature with adjustable hysteresis (±1°C to ±20°C) — no separate thermostat needed.
2.4 GHz WiFi built in — connects directly to your home network. No gateway or bridge device required.
Avoid heating water during peak tariff hours — programme to run on off-peak Economy 7 or Octopus Go overnight rates.
S1/COM input accepts an external temperature sensor or a volt-free contact for advanced control scenarios.
Contemporary dark finish blends with modern kitchen, utility, and bathroom interiors. White version (EHW-W) also available.
Clear display and straightforward programming directly on the device — no app required for basic operation.
Suitable For
About the EHW-B
The EHW-B replaces or supplements a standard hot water timer or immersion heater controller. It mounts on the wall near the water heater and wires to the heater's mains supply via its built-in relay. Its 230V COM/NO/NC relay output (rated 5(2)A) switches the heater according to the programmed schedule and thermostat setpoint.
If you're on an Economy 7, Octopus Go, or other time-of-use electricity tariff, the EHW-B makes it simple to schedule your water heater to run exclusively during cheap-rate hours — typically overnight between 00:30 and 07:30. Set the schedule once in the app and the heater will automatically exploit your cheapest electricity without any manual intervention.
The built-in thermostat monitors water temperature using the S1/COM input, which accepts an NTC temperature sensor (such as a clip-on or immersion probe) or a volt-free contact from an existing thermostat. The hysteresis band is adjustable from ±1°C to ±20°C, giving flexible control suited to everything from precise temperature maintenance to simple bang-bang switching.
The EHW's built-in relay is rated 5(2)A — suitable for directly switching low-power water heaters or signal circuits. For controlling higher-current immersion heaters or boiler loads, the EHW should be wired to a 16A contactor or external relay, with the EHW's output controlling the contactor coil.
Key Features
- WiFi 2.4 GHz built in — no hub or gateway required
- ENGO Smart app control (iOS & Android, Tuya Cloud)
- Programmable timer — set operating hours and heating schedule
- Built-in thermostat with adjustable hysteresis (±1°C to ±20°C)
- Display temperature accuracy: 0.5°C
- Relay output: NO/COM/NC, rated 5(2)A at 230V
- S1/COM input: NTC temperature sensor or volt-free contact
- 230V AC 50Hz power supply
- Energy savings — avoids unnecessary heating
- Intuitive onboard control panel and display
- Matt black finish (see EHW-W for white)
- Compact 90 × 90 × 44 mm housing
- Wall mount installation
Technical Specifications
| Specification | Value |
|---|---|
| Model | EHW-B |
| Colour | Matt Black |
| Power Supply | 230V AC / 50Hz |
| Communication | Wi-Fi 2.4 GHz (no hub required) |
| App | ENGO Smart (Tuya Cloud) — iOS & Android |
| Relay Output | NO/COM/NC, 5(2)A at 230V AC |
| Sensor/Input (S1/COM) | NTC temperature sensor or volt-free contact |
| Control Algorithm | Hysteresis (±1°C to ±20°C) |
| Display Accuracy | 0.5°C |
| Dimensions | 90 × 90 × 44 mm |
| Mounting | Wall mount |
Installation Notes
Installation must be carried out by a qualified person per BS 7671. Ensure the relay output rating is appropriate for the load being switched — use an external contactor for loads exceeding 5A.
- Wire 230V L and N to the power supply terminals
- Connect the NO/COM output to the heater's mains supply (for loads up to 5A direct; use a contactor for larger loads)
- Connect an NTC temperature sensor to S1/COM for thermostat operation, or a volt-free contact for ON/OFF override
- Wi-Fi setup: 2.4 GHz only — ensure your phone is on 2.4 GHz during app setup
- Programme schedule and setpoints directly on the device or via the ENGO Smart app
Frequently Asked Questions
Can this control a standard immersion heater?
Yes, but most immersion heaters draw 3kW (approx. 13A) which exceeds the relay's 5A rating. Wire the EHW's relay output to a 16A contactor coil, and let the contactor switch the immersion heater directly. The EHW controls the contactor; the contactor controls the heater.
Do I need an app to use this?
No — the EHW can be programmed and operated directly using the onboard control panel and display. The app adds convenience (remote access, scheduling from anywhere) but is not required for basic operation.
Does it work with any water heater?
It is compatible with most electric water heaters and immersion cylinder systems that accept on/off switching control. It is not suitable for gas boiler hot water circuits (which use a different control method) or combi boilers.
Is there a white version?
Yes — the EHW-W is identical in specification and features but finished in white. See the EHW-W listing.
Does the built-in thermostat need a separate sensor?
Yes — the thermostat function requires an external NTC temperature sensor connected to the S1/COM terminals. Without a sensor, only timer-based on/off control is available.
What's in the Box
- 1× EHW-B WiFi hot water timer (matt black)
- Wall mounting fixings
- Quick installation guide
Note: NTC temperature sensor sold separately. For the white version see EHW-W.
Installation by qualified person per BS 7671. Relay rated 5(2)A — use external contactor for loads exceeding 5A. 2.4 GHz Wi-Fi only. White version available: EHW-W.
