01 / ROOM CONTROL
E40 thermostat
One battery thermostat for each independently controlled room. Available in white or black.
View E40 thermostat →Wireless Retrofit Heating Controls
Wireless retrofit • ENGO controls
Your rooms.
Your comfort.
Less disruption.
Give each room its own temperature control — without running new wires to the room thermostats or radiator heads.
Check my setup with RBSi →Battery-powered room controls. A powered hub and professionally connected plant relay complete the system.
The temperature you choose in the room.
The radiator response to match.
A practical upgrade for existing homes
Better control, room by room.
A comfortable living room. A cooler bedroom. A home office that follows your working day. ENGO room controls let you manage compatible radiator heating around the way you use your home.
RBSi already supplies this approach with client heat-pump packages. We can help you select the right components for your existing system too.
Set the room, not just the valve
The E40 room thermostat measures the room temperature and works with its paired radiator heads.
Keep the room wiring simple
Battery-powered thermostats and heads mean no new control cables to those devices.
Bring it together online
The EGATE-PRO connects compatible devices to ENGO Smart for app access and scheduling.
The building blocks
Four parts. One considered system.
02 / RADIATOR CONTROL
ETRV-M30 head
A battery head for each compatible radiator valve. Pair up to six heads to one E40 in the same room.
View radiator head →
03 / ONLINE CONNECTION
EGATE-PRO hub
Connect compatible ENGO ZigBee devices to the ENGO Smart app. The gateway requires power and an internet connection.
View gateway →
04 / HEAT SOURCE
EREL-16ZB relay
A ZigBee relay with a voltage-free output for suitable heating-control inputs. Requires a 230 V supply and installer wiring.
View smart relay →How it connects
Wireless in the room.
A checked connection at the plant.
E40 room thermostatMeasures and controls room temperature
↔868 MHz
ETRV radiator headsUp to six paired heads in that same room
Compatible ENGO ZigBee devicesE40 thermostat and EREL relay
↔ZigBee
EGATE-PRO + ENGO SmartGateway, internet connection and app
EREL-16ZB relayPowered and connected by an installer
→Wired output
Compatible boiler or heat pumpSuitable control input and system design required
System overview only — not a wiring diagram. Device pairing, heat-demand configuration and heat-source compatibility must be checked for the complete installation.
Start with your home
Let’s get the combination right.
Send RBSi a few details before ordering. We’ll help identify the components and compatibility checks for your project.
Check my setup on WhatsApp →Prefer email? m.teahan@rbsi.ie
Helpful details to send
- Your boiler or heat-pump make and model
- Number of rooms and radiators to control
- Clear photos of your existing radiator valves
- Your current thermostat, programmer and zones
No one-size-fits-all kit: the right quantities and control arrangement depend on your home.
A few useful answers.
Is the whole system completely wire-free?
No. The E40 thermostat and ETRV heads are battery-powered, so they do not need new control wiring. The gateway needs power, and the EREL relay needs a 230 V supply and a wired connection to the appropriate heating-control input. That work should be completed by a qualified installer.
Will the heads fit my radiators?
The ETRV-M30 uses an M30 × 1.5 valve connection. Your existing valve body and any adaptor requirements need checking — a radiator alone does not guarantee compatibility. Send us valve photos before choosing heads.
Can I use it with a heat pump?
Potentially, with a suitable control input and a properly designed system. Your installer must check the heat pump’s control strategy, minimum water flow and system volume, including what happens when radiator zones close. Do not assume every heat pump or existing arrangement is suitable.
Can one thermostat control several rooms?
Use a separate thermostat for each room you want to control independently. The E40 can pair with up to six ETRV heads in the same room; those heads follow that room’s temperature control, not six separate room setpoints.
Ready for room-by-room control?
Start with a setup check, or explore the four components above if you already have an agreed specification.
Plan my retrofit →Ordering from Ireland? See delivery information and shipping terms. Shipping charges are calculated at checkout where applicable. If your destination is unavailable, or you need project-specific advice, contact RBSi.