Honeywell Home THR842DEU DT2R Wireless Thermostat

The Honeywell Home THR842DEU DT2R is a wireless room thermostat with an LCD display, push-button controls and a timed ECO setting. Its stated self-learning TPI control and 5°C to 35°C set-point range make it relevant for buyers seeking straightforward heating or cooling control, but confirm compatibility with the existing system before choosing it.

At a glance

Timed ECO setting lets the user choose a lower set point for 1 to 24 hours in one-hour increments.
The listing describes two-way wireless communication and a signal-strength test.
Manufacturer feature details state that batteries are included and the front cover unclips for battery changes.

Price

£80.00Save 41%

Reference price: ~~£134.90~~

Price checked: 12 Nov 2026

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Pros and cons

Pros

Timed ECO control offers a defined lower-temperature period without requiring a fixed daily schedule.
Wireless operation and stated wall mounting may suit installations where a wired room control is not wanted.
The large display and simple interface are presented as easy to read and operate.

Technical specifications

11 specifications

Identity
Brand	Honeywell Home
Model	THR842DEU

Display
Screen size	9 Centimetres
Screen technology listed	LCD

Connectivity and controls
Wireless connection listed	Wireless
Control methods listed	Touch

Power and battery
Power configuration	Battery Powered

Dimensions and installation
Mounting types listed	Wall Mount
Dimensions listed	2.9D x 9W x 9.2H centimetres

Temperature control
Set-point range	5°C to 35°C
Special feature	Intelligent Self-Learning (TPI) and ECO Mode

What to know before buying

Listing details to confirm

The title identifies a THR842DEU DT2R, while A+ content repeatedly describes DT3 features and compatibility. The listing also describes controls as both push-button and touch, calls the screen LCD in one field but LED-based elsewhere, and gives a battery-powered configuration alongside 230 Volts. Verify the exact model, control interface, display, power arrangement and compatibility with your heating or cooling system before buying. The 9-centimetre screen size is listed without clarifying what dimension it measures.

What’s in the box

Included

1 piece

Who is it for?

A good fit for

Buyers seeking a wireless room thermostat with a timed ECO setting and self-learning TPI control.
Households that prefer local controls and do not need the stated listing features to depend on an app or Wi-Fi.

Less suited to

Buyers who need confirmed compatibility with a particular boiler, heat pump or control system without checking the exact model.
People seeking a clearly specified programmable weekly schedule or smart-device app control. The supplied THR842DEU feature details do not confirm these.

Honeywell Home THR842DEU DT2R Wireless Thermostat · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.1 / 5 · 102 ratings

5 stars61%61%
4 stars18%18%
3 stars7%7%
2 stars6%6%
1 star8%8%

There is no supplied written customer-feedback summary, so specific praised features or complaints cannot be attributed to customers. Aggregate ratings lean positive, but a substantial minority fall into the lower star categories. Treat this as a broad satisfaction signal rather than evidence about compatibility, controls or performance for a particular installation.

Frequently asked questions

Does the THR842DEU need Wi-Fi?

The supplied THR842DEU feature details describe wireless communication but do not specify Wi-Fi. A+ text says DT3 thermostats need no Wi-Fi, but that is a different model line, so confirm the requirements for the exact unit.

How does the ECO setting work?

The listing says the ECO button allows a lower set point for a timed period chosen from 1 to 24 hours in one-hour increments.

Is it compatible with my heating system?

The listing describes heating or cooling control, but its A+ compatibility information relates to the DT3 range rather than consistently to the THR842DEU. Check compatibility for your exact system and thermostat model before purchase.