Honeywell Home DT4 White Wired Room Thermostat | DT40WT20 On/Off Digital Heating Control

The Honeywell Home DT4 White Wired Room Thermostat DT40WT20 is a slim, modern digital thermostat for precise room temperature control in homes and apartments. Featuring a large clear LED segment display with energy-efficient auto-off and simple wake-up button, it delivers reliable performance with contemporary styling.

Key Features

• Energy-saving LED display automatically dims when not in use to extend battery life.
• Backlit touch buttons for easy operation in all lighting conditions.
• Built-in eco offset reduces temperature for set periods to save energy.
• Fuzzy logic control optimises boiler cycling for accurate temperature maintenance.
• Compatible with hybrid systems including heat pumps, zoning, underfloor heating, and zone valves.
• Frost protection maintains minimum 5 °C when off to prevent pipe freezing.

Why Choose Honeywell Home DT4 White?

Combines modern aesthetics with proven reliability, offering simple user operation alongside advanced energy-saving features and wide system compatibility.

ErP Class IV (+2%) rating meets current heating control efficiency standards with 5-year installer warranty option.

Suitable For

• Gas boilers, combi boilers, heat pumps (24-230 V on/off control).
• Zone valve systems and multi-zone heating applications.
• New builds and replacements requiring wired wall-mounted thermostats.

Technical Specifications

• Brand: Honeywell Home by Resideo
• Model: DT4 White Wired Room Thermostat
• MPN: DT40WT20
• GTIN: 5059085002619
• Control Type: On/Off (24-230 V)
• Power Supply: 2 x AA batteries (included)
• Battery Life: Approx. 3.5 years
• Set Point Range: 5 °C to 35 °C
• Display Range: 0 °C to 40 °C
• Sensor Type: 10k NTC @ 25 °C
• Switching Capacity: 3 A resistive, 1 A inductive
• Switch Type: SPDT
• ErP Class: Class IV (+2 %)
• Dimensions: 101 x 101 x 23 mm (HxWxD)
• Weight: 0.245 kg
• Terminals: Up to 2.5 mm²
• Warranty: 2 years standard (5 years installer option)

Installation & Operation

Wall-mounted wired installation with flip-up wiring platform for simple connection. User-friendly menu for heating/cooling selection, eco settings, and frost protection. Installer configuration includes cycle rate, limits, and system commissioning options.