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Honeywell Home DT4 Grey Wired TPI Thermostat (DT40GT21)


3 in stock

Honeywell Home DT4 Grey Wired TPI Thermostat (DT40GT21)


  • Can be installed standalone* or part of an existing heating system*, including conventional and combi boilers, as well as new heating systems.
  • Easy-to-read LED-based display with energy-efficient technology that turns off when not in use.
  • Backlit, captive touch buttons for ease of use.
  • Built-in eco-mode to help save money and reduce environmental impact by reducing room temperature for a set time period.
  • Wireless versions also available to suit almost any installation


The Honeywell Home DT4 room thermostat is a versatile heating control option. It is compatible with a wide range of heating systems, including conventional and combi boilers. Its LED-based display is energy-efficient and easy to read, with the ability to turn off when not in use.

Its backlit, captive touch buttons make it easy to use, and the built-in eco-mode lowers room temperature for a set time period to reduce energy consumption.

In addition, the thermostat features a boost mode that increases room temperature for a set time period when needed.

In summary, the Honeywell Home DT4 room thermostat is the perfect solution for efficient temperature control. With its sleek design, easy-to-use interface, and compatibility with a range of energy-efficient solutions, it’s the smart choice for any home.


Honeywell Home DT4 Brochure 

Honeywell Home DT4 Product Data



Application On/off boiler (230V), Combi boiler, Heat Pump, 2-Port Zone Valve
Approvals and Standards EMC: 2014/30/EU, LVD: 2014/35/EU, R&TTE: 1995/5/EC
Display Functions Heat, Cool, Eco, Off, Low Battery, Warning
Modes of Operation Heating, Cooling, Off
Alerts and Reminders Battery Replacement
Power Supply Thermostat: Powered by 2 X AA Batteries
Color Grey
Sensor Type 10k (@25 °C) NTC thermistor
Ambient Operating Temperature (Max) 40 °C
Ambient Operating Temperature (Min) 0 °C
ErP Class Class IV (+2 %)
Terminal Wire Size (Max) 2.5 mm2
Control Functions Fuzzy Logic
Cycle Rate Selectable by application
Set point Temperature (Max) 35 °C
Set point Temperature (Min) 5 °C
Shipping and Storage Temperature (Max) 50 °C
Shipping and Storage Temperature (Min) -20 °C

If you have any questions about the Honeywell Home DT4 Wired Room Thermostat, please feel free to Contact Us.


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