01
Remote temperature & boiler control
View the room temperature, adjust the setpoint and control the boiler output from GEYER Smart.
GEYER SMART · GS-THWHB · WI-FI ROOM & BOILER THERMOSTAT
Room comfort and hot water. Controlled from one thermostat.
A wall-mounted Wi-Fi thermostat for hydronic heating systems with a separate boiler output, remote temperature control, weekly schedules and direct boiler ON/OFF through GEYER Smart.
Choose colour
5–37 °CSetting range
2 × 5 AHeating & boiler outputs
2 in 1Room heating & boiler
Temperature & boiler controlGEYER Smart
Selected modelGS-THWHB-W
CONNECTED ECOSYSTEM
Amazon Alexa
Google Home
Tuya Smart
Smart LifeTEMPERATURE · BOILER · SCHEDULING
Two heating needs. One connected control.
GS-THWHB combines room-temperature control with a separate boiler output in one wall-mounted Wi-Fi thermostat.
02
Weekly schedules
Create different temperature schedules for every day of the week through the app.
03
Manual & ECO modes
ECO mode provides a 20-minute operating cycle each time it is activated.
04
Dedicated boiler control
Switch the boiler output locally from its dedicated touch button or remotely from the app.
TWO COLOURS · DUAL CONTROL
Choose white or black with the same room-heating and boiler functions.
GEYER SMART APP
Temperature and boiler control from your phone.
View room temperature, change the setpoint, organise weekly schedules and switch the heating system or boiler output from one screen.
APPLICATIONS
Room comfort with separate hot-water control.
01
UNDERFLOOR HEATING
Control compatible hydronic underfloor heating according to room temperature.
02
HYDRONIC RADIATOR HEATING
Maintain the desired temperature in compatible hydronic radiator heating systems.
03
DOMESTIC HOT WATER
Control a compatible boiler circuit separately from the room-heating output.
04
HOLIDAY HOME
Adjust the temperature and control the boiler remotely before arrival.
Compatibility with the heating system, control input and electrical installation must be assessed by a qualified electrician.
TECHNICAL SPECIFICATIONS
Designed for room heating and boiler control.
A surface-mounted Wi-Fi thermostat with separate heating and boiler outputs, available in white and black.
CEREDWEEE2 years
Product codesGS-THWHB-W (white) · GS-THWHB-B (black)
Power supply220 V AC
Standby power consumption≤1 W
OutputsRoom heating · boiler
Resistive loadUp to 5 A per output
Temperature setting range5–37 °C
Measurement accuracy±0.1 °C
Temperature hysteresis0.5–5 °C
Temperature calibration−9.9 °C to +9.9 °C
Operating environment0–55 °C · <95% RH, non-condensing
Operating modesManual · ECO · OFF
Wi-Fi2.4 GHz
MountingSurface mounted
ConnectionTerminal block
Dimensions113 × 113 × 22 mm
MaterialPC + ABS
Ingress protectionIP20
ColoursWhite · black
Warranty2 years
ComplianceCE · DoC: LVD / EMC / RED / RoHS
INSTALLATION & PAIRING
Three essential steps.
01
Installation
Have the power supply, compatible heating input and boiler circuit connected by a qualified electrician with the supply isolated.
02
App
Download GEYER Smart from the App Store or Google Play, enable Bluetooth and connect the phone to a 2.4 GHz Wi-Fi network.
03
Pairing
During normal operation, press and hold the down arrow and centre button for about 3 s until the Wi-Fi icon flashes, then add the thermostat in the app.
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ELECTRICAL SAFETYHeating-system and boiler compatibility, output-contact selection, protection and wiring must be assessed and completed by a qualified electrician. Isolate the supply before installation.
WIRING & DISPLAY
Separate outputs for heating and boiler.
The VCOM/VNO/VNC and HCOM/HNO/HNC outputs are voltage-free relay contacts. They can switch the live conductor when L is connected to VCOM and/or HCOM, as applicable. Connect them according to the wiring diagram and system requirements.
FREQUENTLY ASKED QUESTIONS
The essential answers.
What is the difference between GS-THWHB-W and GS-THWHB-B?+
Only the colour, product code and packaging differ. Functions and technical specifications are identical.
How does GS-THWHB differ from GS-THWH?+
GS-THWHB adds a separate output and dedicated control for a compatible boiler circuit, alongside room-heating control.
Can the boiler be controlled from the app?+
Yes. The GEYER Smart screen provides separate controls for the heating system and boiler output.
Can I create weekly schedules?+
Yes. Weekly room-temperature schedules can be created through GEYER Smart.
Does it connect to 5 GHz Wi-Fi?+
No. GS-THWHB connects exclusively to a 2.4 GHz Wi-Fi network.
Who should install it?+
Electrical connection and compatibility assessment for both controlled circuits must be completed by a qualified electrician.
VIDEO
Product videos.
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Video content coming soon
TESTIMONIALS
Everyday experiences with GS-THWHB.
Control for room heating and domestic hot water.
01“
I use these thermostats in homes with radiators where the customer wants to replace an old thermostat. Installation is practical, and smartphone control adds real convenience.
KostasElectrician
02“
I created a weekly heating schedule so the house warms up before I return from work. If my plans change, I can adjust the temperature from my phone.
EleniHomeowner
03“
With GS-THWHB I can adjust the heating and have domestic hot water ready before guests arrive. The home is prepared without me having to be at the property.
PanagiotisAirbnb owner
DOCUMENTATION GS-THWHB-W / B