Call our Sales Experts
01386 800723
Lines open between 9:00am - 5:00pm

Honeywell DT90E Wired Digital Room Thermostat


Honeywell DT90E Wired Digital Room Thermostat

The Honeywell DT90E Wired Digital Room Thermostat leads the way in energy efficient control by using advanced technology to maximise the energy efficiency of the heating system. The Honeywell DT90E Wired Digital Room Thermostat has been designed to provide automatic temperature control of gas or oil fired boiler systems, underfloor heating, electric heating and zoning systems.  

Energy efficiency is addressed by state of the art control performance qualifying it as a Load Compensator. The Honeywell DT90E Room Stat has an ECO button energy saving feature which gives timed setback or boosts temperatures to reduce energy demand.
The Honeywell DT90E Digital Room Stat is a TPI (Time Proportional Integral) control product as defined in the Building Regulations, which make boilers operate more efficiently and provide close accurate control.
It also incorporates an ‘OFF’ setting that can be used for frost or hypothermia protection, assuming the system time control is also switched on. 'Installer Mode' also allows control to be matched to the system and user requirements, adapting minimum on or off times, set point controls etc.
Two wire, volt free connections are ideal for use with combination boilers or heating zones.
Honeywell DT90E Digital Room Thermostat Features & Benefits:

  • Energy saving TPI control
  • ECO button for energy saving mode
  • Simple user operation
  • 5 to 35°C set point range
  • 'OFF' setting with adjustable OFF setpoint
  • Direct replacement of the DT200 digital thermostat
  • Mains or low voltage switching
  • Two wire connection


CE Approved

Honeywell DT90E Wired Digital Room ThermostatProduct Specification

Manufacturer Part Number 311982
Boxed Weight 0.11kg

£29.44 (Inc. VAT)

RRP £49.97 Save  41%

11 Available 

Honeywell DT90E Wired Digital Room ThermostatReviews

Add your
own review

4.8/ 5
21 reviews
5/ 5

Pros: Standard size to fit, easy to use, like the ECO setting.

Cons: Uncertainty on how to connect wiring (6 options given to suit individual existing wiring) - we got it wrong first time and blew the fuse in the switch box for our various room stats.

Replaced failed mechanical room stats with Honeywell DT90E from PlumbWorld. Arrived on time, in perfect condition. Just installed them a day ago and they all work as intended - just beware that you get the wiring right for your situation, it's not 100% clear so take care to match the wiring you have with the appropriate option in the instructions

ID: 100010107
5/ 5

Pros: It does exactly what it was purchased for!!

Cons: The installation instructions are really difficult to understand, and even momentarily confused my friend, who is actually an electronic engineer

The product does everything it is supposed to do..and more. Once I had figured out the instructions, which were extremely difficult to understand, the actual installation was easy. Unfortunately, as I already have a programmer for my central heating system, I do not use the additional features of this thermostat

ID: 100002369
5/ 5

Pros: It arrived quickly, was easy to fit, easy to set and to understand and is very quiet in operation. It also provides a constant read-out of the ambient temperature.

Cons: The two plastic lugs which need to be unclipped to remove the face of the unit are a bit of nuisance to manipulate without three hands.

This digital thermostat replaces a mechanical version. It is so much more precise in maintaining temperature than the previous stat, which was not that old.

A first class product at a good price.

ID: 100002426
5/ 5

Pros: Easy fit , Looks good , Works well

Cons: Initial set up is fiddly ( but not too challenging), The instructions could be clearer

ID: 100001576
5/ 5

Pros: Ease of installation.

Cons: None

What a good product for the money.So easy to install and works perfectly

ID: 100007986
5/ 5

Pros: Easy to fit

Cons: None as far as I am concerned

I have been looking for a digital thermostat to replace my old thermostat which was not accurate. This thermostat was very easy to install and very simple to use. It is very accurate and controls my boiler much better than the old unit. No more huge temperature over runs it keeps the room temperature within .5 of a degree which has reduced my oil consumption. This thermostat meets all the latest build regulations

ID: 100006911
5/ 5

Purchased this to replace old dial thermostat. This is easy to fit and operate, has a lovely clear display and is much slimmer than the old one we had. Shows current temperature all the time and has eco setting too. Much cheaper at Plumbworld than other suppliers.

ID: 100000707
4/ 5

Pros: Easy to intall and use. Large display. ECO button

Cons: Would be better if it had a backlight on the display.

Purchased as a replacement for old mechanical 4 wire thermostat. Has now been working for approx 4 months with no problems. I was concerned about other reviews regarding noisy relay but you can hardly hear it. The eco button is very usfull if going out for the day.

ID: 100002920

£29.44 (Inc. VAT)

RRP £49.97 Save  41%

11 Available 

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we'll assume that you are happy to receive all cookies on our website. However, if you would like to, you can change your cookie settings at any time. To find out more about how we use cookies please view our Cookie Policy

Accept and Continue