The Honeywell Home DT4R Black Wireless Room Thermostat Spare (DTS42BRFST22) is a replacement wireless thermostat head designed for compatible Honeywell Home heating control systems. Finished in modern black, it features a large, clear LED segment display, an easy-to-use wake-up button and backlit touch controls for convenient temperature adjustment.
Supplied as a spare thermostat head only, with no receiver box included, this DT4R model is suitable for replacing an existing thermostat or expanding a compatible wireless heating system. It supports compatible Honeywell Home evohome and HCC100 systems through the Ramses II/III RF protocol.
Honeywell Home DT4R Range Wireless RF Black Finish Spare Thermostat Only
Important – Thermostat Only
This product does not include a receiver box. Ensure you already have a compatible Honeywell Home receiver or control system installed before ordering.
Key Features & Benefits
1. Replacement DT4R Wireless Thermostat
Designed as a spare or replacement thermostat head for compatible Honeywell Home wireless heating systems, helping replace a faulty unit or add another thermostat to an existing installation.
2. Compatible with evohome and HCC100
Designed to pair with compatible Honeywell Home evohome and HCC100 Underfloor Multi-Zone Controller receivers, supporting suitable multi-zone heating applications.
3. Modern Black Finish and Clear LED Display
The slim black design complements contemporary interiors, while the large LED segment display provides a clear view of the temperature setting.
4. Backlit Touch Controls and Wake-Up Button
Backlit captive touch buttons make temperature adjustments straightforward. The auto-off display helps conserve battery power, while the wake-up button brings the screen back on when needed.
5. Ramses II/III Wireless RF Communication
Uses Honeywell Home's Ramses II/III RF protocol on the 868.0–868.6 MHz frequency band to communicate with compatible receivers without requiring an internet connection.
6. Battery-Powered Operation with Eco Mode
Powered by 2 x AA batteries, this thermostat offers wireless installation flexibility. Its built-in timed Eco mode applies a temperature reduction to help manage heating use.
Compatibility and Applications
The Honeywell Home DT4R Black Spare Thermostat is designed for compatible Honeywell Home wireless heating control systems and suitable on/off appliances.
- Honeywell Home evohome systems with compatible receivers.
- Honeywell Home HCC100 Underfloor Multi-Zone Controller.
- Compatible legacy Honeywell Home RF systems using the Ramses II/III protocol.
- Suitable 24–230V on/off gas boilers and combi boilers.
- Compatible heat pumps with an appropriate on/off control input.
- Suitable zoning, underfloor heating, cooling and zone valve applications.
Important compatibility note: This thermostat is not suitable for directly controlling 240V electric heating circuits. Check your existing receiver and appliance requirements before purchasing.
Technical Specifications
| Brand |
Honeywell Home by Resideo |
| Product Range |
DT4 |
| Model |
DT4R Black Spare Thermostat |
| Manufacturer Part Number |
DTS42BRFST22 |
| EAN / GTIN |
5059085002695 |
| Product Type |
Spare wireless thermostat head |
| Colour |
Black |
| Power Supply |
2 x AA batteries |
| Set Point Range |
5°C to 35°C |
| Display Range |
0°C to 40°C |
| Sensor Type |
10k NTC thermistor at 25°C |
| RF Protocol |
Ramses II/III |
| RF Frequency |
868.0–868.6 MHz |
| Wireless Range |
Approximately 30 metres (residential) |
| ErP Contribution |
Class V (+3%) |
| Dimensions (W x H x D) |
101 x 101 x 54 mm |
| Weight |
0.25 kg |
| Warranty |
2 years |
| Receiver Included |
No – thermostat head only |
Frequently Asked Questions
Does the Honeywell DT4R Black thermostat come with a receiver box?
No. The DTS42BRFST22 is supplied as a spare thermostat head only. A compatible Honeywell Home receiver or control system must already be installed.
What systems is the DT4R Black compatible with?
It is specified for compatible Honeywell Home evohome and HCC100 Underfloor Multi-Zone Controller receivers, as well as compatible legacy RF systems using the Ramses II/III protocol. Check your exact receiver model before ordering.
Can I use this thermostat to control electric heating?
No. It is not suitable for direct control of 240V electric heating circuits. It is intended for compatible 24–230V on/off control applications.
How is the thermostat powered?
The thermostat operates using 2 x AA batteries and does not require a wired mains power connection at the thermostat location.
What is the wireless range of this thermostat?
The stated residential RF range is approximately 30 metres. Actual range may vary depending on building construction and signal conditions.
Order Honeywell Home DT4R Black Spare Thermostat from GetPlumb
Choose the Honeywell Home DT4R Black Wireless Room Thermostat Spare DTS42BRFST22 for a compatible existing wireless heating control system. Check receiver compatibility before ordering and remember that this listing includes the thermostat head only.
Order Now from GetPlumb for your heating control requirements.
