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DT3 Wired Thermostat for Heating Control with Energy Efficient LED, No WiFi or App Required (White)

DT3 Wired Thermostat for Heating Control with Energy Efficient LED, No WiFi or App Required (White)

Q: Can this replace an old siemens raa20 analouge

I'm afraid that's an almost impossible question to answer properly since the features the Siemens unit and the Honeywell thermostat are very different, and don't overlap in many details. It is 'similar' in that it will 'request' heat when the temperature falls below the (adjustable) setting. [This feature simply relies on a small relay closure within the Honeywell thermostat, but the wiring for this appears to be slightly different from that of the Siemens.] It does not offer any facility to request cooling. Also, be aware that this Honeywell thermostat uses 2 x AA batteries to maintain its time/temperature settings: this may not be 'appropriate' in certain circumstances where a public building is involved. This Honeywell thermostat is really only intended for domestic purposes. I would honestly recommend you approach a qualified heating engineer if you really need to replace the Siemens unit for any reason.

Q: why does it need batteries if it is wired?

The thermostat works like a light switch where it makes and breaks a live wire.So unless you had a 3 core cable going from the boiler to the thermostat you would need batteries to power it. The Thermostat requires a neutral wire and a live wire to power the display like a plug does.

Q: Hi my honeywell cm921 needs replacing. is this compatible?

Hi there, in short no. The CM921 is programmable, which means you can us it to set times for your heating to go on and off. The 842 is just a thermostat. This will only control the temperature of your heating. hope this helps.

Q: can i use this with a three wire system

Yes there are 3 terminals to wire into

Product ID: 544359867

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Details

Brand
Honeywell Home
Model name
DT3
Controller type
Touch screen
Special feature
Frost
Colour
Wired White
Specific uses for product
Heating and

⚡Energy-efficient LED display

🔧Easy wired installation with QR video guides

🌡️Advanced TPI fuzzy logic temperature control

Frequently Bought Together

Honeywell Home DT3 Wired Thermostat for Heating Control with Energy Efficient LED, No WiFi or App Required (White)

Honeywell Home THR860SWE TM2 Digital Timer, White

Description

🌟 Upgrade your comfort game—no apps, no fuss, just smart heating control!

ECO MODE FOR SAVINGS - Built-in energy-saving programs reduce costs without sacrificing warmth.
UNIVERSAL COMPATIBILITY - Works seamlessly with hybrid, heat pumps, underfloor heating, and OpenTherm systems.
FROST PROTECTION BOOST - Automatic frost guard plus quick-heat boost mode keeps your home cozy on demand.
PLUG PLAY INSTALLATION - Wired setup with clear manuals and QR code videos—get up and running in no time.
SLEEK SMART SIMPLICITY - Modern slim design with intuitive capacitive touch controls for effortless comfort.

The Honeywell Home DT3 Wired Thermostat combines sleek modern design with professional-grade features like energy-efficient LED display, advanced fuzzy logic temperature control, and versatile compatibility with multiple heating systems. Designed for easy wired installation with step-by-step video support, it offers built-in eco and boost modes plus frost protection, making it the perfect no-nonsense smart thermostat for energy-conscious homes.

Specifications

Manufacturer	Resideo
Part number	DT30WR10
Item Weight	110 g
Product Dimensions	10.1 x 2.35 x 10.1 cm; 110 g
Item model number	DT30WR10
Size	1
Colour	Wired White
Style	Wired \| Premium
Material	Metal, Plastic
Shape	Rectangular
Power source type	Corded Electric
Voltage	1 Volts
Item Package Quantity	1
Display style	LED
Plug profile	Wall Mount
Special Features	Frost Protection
Specific uses	Heating, ventilation and air conditioning
Included components	1x DT3 thermostat
Batteries Required?	No

Have a Question? See What Others Asked

Can this replace an old siemens raa20 analouge

why does it need batteries if it is wired?

Hi my honeywell cm921 needs replacing. is this compatible?

can i use this with a three wire system

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