The Honeywell Home T4R 7-Day Wireless Programmable Room Thermostat (model Y4H910RF4003) provides automatic time and temperature control for heating systems in homes and light commercial premises. As the wireless member of the T4 family, it pairs with a pre-bound wireless receiver box, so the only wiring required on installation day is connecting that receiver to the boiler or heating appliance being controlled.
Compatible with 24-230V on/off appliances such as gas and combi boilers, and supporting OpenTherm control as standard, the T4R suits a wide range of system types, including use as a temperature sensing device in S or Y Plan systems. A clear digital display with simple push-button programming, energy-saving features like Optimum Start and Delayed Stop, and a 30m operating range between thermostat and receiver make it a practical, flexible upgrade for existing or new heating controls.
24-230V
On/Off & OpenTherm
7-Day
Programmable Schedule
868 MHz
Wireless Frequency
30 m
Typical Operating Range
Pre-Bound
Thermostat & Receiver
1 Year
Manufacturer Warranty
Pre-Bound, Ready to Install
The T4R thermostat and its wireless receiver box arrive pre-bound from the factory, so there's no separate binding process required during installation - simply wire the receiver to the boiler and the thermostat is ready to use.
Not for Electric Heating Circuits
The T4R works with 24-230V on/off appliances such as gas boilers and combi boilers, and also supports zone valve applications and OpenTherm appliances, but is not suitable for 240V electric heating circuits.
Qualified Installation Required
The receiver box connects to mains-wired heating circuitry. Installation should be carried out by a qualified electrician or heating engineer in accordance with current UK wiring regulations.
OpenTherm Support as Standard
The T4R supports OpenTherm control via its wireless receiver box, giving more precise, modulating boiler control on compatible appliances rather than simple on/off switching.
Energy-Saving Optimisation
Built-in Optimum Start, Delayed Stop and Holiday Mode functions help reduce energy use by adjusting heating timing automatically and allowing the system to be paused while away.
Simple 7-Day Programming
A clear digital display with easily identifiable icons and simple push-button controls make setting up a 7-day, 5/2-day or 24-hour schedule straightforward for installers and homeowners alike.
Reliable 30m Wireless Range
Communication between the thermostat and receiver box operates on 868 MHz with a typical range of 30 metres, suiting most residential and light commercial layouts.
Versatile System Compatibility
Works with combi boilers, oil and gas-fired boilers, circulation pumps, thermal actuators and zone valves, and can be used as a temperature sensing device in S or Y Plan systems.
Minimal Installation Wiring
As the thermostat and receiver are pre-bound, the only wiring needed is connecting the receiver to the controlled appliance, keeping installation time to a minimum.
General
Model / MPN
Y4H910RF4003
Product Family
T4/T4M/T4R Programmable Thermostats
Installation Type
Wireless (thermostat + pre-bound receiver box)
Width
135 mm
Screen Type
LCD
Timer Cycle
7 Day / 5-2 Day / 24 Hour
Compatibility
Appliance Compatibility
24-230V on/off: gas boilers, combi boilers, zone valves
230V mains / low-voltage bus, depending on installation
Energy Features & Warranty
Energy-Saving Features
Optimum Start, Delayed Stop, Holiday Mode
Warranty
1 year
Does this thermostat come with a receiver box?
Yes, the T4R kit includes both the wireless thermostat and a receiver box, which arrive pre-bound from the factory so no separate binding step is needed during installation.
Is this compatible with OpenTherm boilers?
Yes, the T4R supports OpenTherm control as standard via its wireless receiver box, alongside standard 24-230V on/off appliance compatibility.
What is the wireless range between thermostat and receiver?
The typical operating range is around 30 metres, operating on the 868 MHz frequency band; actual range can vary depending on walls and obstructions.
Can this thermostat be used with electric heating?
No, the T4R is designed for 24-230V on/off and OpenTherm appliances such as gas and combi boilers, and is not suitable for direct control of 240V electric heating circuits.
What scheduling options are available?
The T4R supports 7-day, 5/2-day, or 24-hour programmable schedules, with a clear LCD display and simple push-button controls for setting time and temperature changes.
BTU & WATT Calculator
Room Dimensions
Room Type
Living Room
Bedroom
Kitchen
Bathroom
Conservatory
Hallway
Glazing Type
Single Glazed
Double Glazed
Triple Glazed
External Walls
0 Wall
1 Wall
2 Walls
3 Walls
4 Walls
Insulation Level
Poor
Average
Good (New Build)
Required Heating
0
Watts
0
BTUs
Documentation
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