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Honeywell CMT921 Wireless Room Thermostat (87377)

Electronic sensing element. Wireless. Override facility. Holiday mode. Automatic BST/GMT time change.

  • Digital Display
  • 1, 2 or 3 On / Off Periods
  • 1 Pre-Set Programme
  • 24 Hour Programmable
  • Wireless
  • Frost Protection
  • Override Facility
  • Holiday Mode
  • Automatic BST/GMT Time Change
  • 1 Year Guarantee

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£119.99INC VAT

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Honeywell CMT921 Wireless Room Thermostat is rated 3.9 out of 5 by 13.
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Rated 5 out of 5 by from Easy to install Received this as a replacement for my old thermostat, didn't need rely box as one already fitted. So easy to connect this new one to rely box, done it in couple of minutes....shame can't just buy replacement thermostat instead of all the equipment.....if just replacing thermostat just need to go to instructions part 5.1 explains how to do it easily I'm female and did it
Date published: 2017-01-14
Rated 5 out of 5 by from Replacement room thermostat I am very pleased with this Honeywell thermostat which I bought to replace a failed Siemens one. The Honeywell was simple to instal including the receiver at the bolier. It has more features and improved funtionality than my old one. So far it seems to maintain a steady temperature without the regular too high and too low room temperature which we suffered with the old one so I suspect it may be more efficient and save gas.
Date published: 2017-01-07
Rated 5 out of 5 by from Perfect for customer Great product what the customer had asked for with fast service from Screwfix.
Date published: 2016-12-23
Rated 1 out of 5 by from what a load of absolute rubbis Bought a CM921 2-3 years ago, and the display is shedding screen information like fast. Contacted Honeywell and basically they do not want to know as I did not keep thd proof of purchase - I mean how many of us keep that info for 2-3 years. If you want a BAD PRODUCT AND A LOAD OF BULL FROM THE MANUFACTURER, THEN THIS IS THE PRODUCT TO BUY.
Date published: 2015-09-30
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Looking for a direct replacement for a CM67NG as screen has gone, is CMT921 the right choice? .

Asked by: Anonymous
The CM67NG was a seven day programmable thermostat. The CMT921 is a one day unit. The CMT927 is a seven day unit.
Answered by: Honeywell Tech Support
Date published: 2017-03-31

Can this directly replace the Drayton SCR?

Asked by: Wildey123
Honeywell products will not work with components of other manufacture. The Drayton Single Channel Receiver (SCR) will only work with the Drayton thermostat. The Honeywell CMT921 can directly replace the Drayton Digistat/RF stat and receiver.
Answered by: Honeywell Tech Support
Date published: 2017-04-03

Will this work with an Ideal Espirit 2 Boiler?

Hi, We've moved to a property and the date and times can only be programmed by going into the loft. Currently we have an RF Honeywell thermostat in the lounge but it only has the room temp buttons and the Eco button. Would this be easy to switch over?
Asked by: Amandac89
The Honeywell CMT921 is suitable for low and line voltage applications and will therefore work with most boilers.
Answered by: Honeywell Tech Support
Date published: 2017-03-31

Is this product suitable for 3 wire installation?

Hi! We have x2 Eberle Instat 6 thermostats controlling upstairs & downstairs zones. We would like to replace them with wireless programable thermostats, mounting the receiver in place of the existing stats which are 3 wire fed. Is there a wireless set-up that would suit? Thanks Adrian, (a Bourne store customer)
Asked by: Snowbird
The Honeywell CMT921 thermostat incorporates an SPDT switch so if a demand and satisfied signal is required this can be accommodated.
Answered by: Honeywell Tech Support
Date published: 2017-04-03

I need a replacement thermostat for the cm921 can I buy this separate ? The screen has smashed,, or do I have to buy them both together

Asked by: Nikikav
If you would like the thermostat separately you will need to contact the manufacturer.
Answered by: jrose
Date published: 2017-01-27
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Specification
Brand Honeywell
Central Heating Control Type Thermostats
Compatible Boiler Type All Boilers
Display Type Digital Display
Manufacturer Guarantee 1 Year Guarantee
Manufacturing Standards RoHS/WEEE
Model No CMT921
Pack Size 1
Pieces in Pack/Case 1
Product Depth 26 mm
Product Height 89 mm
Product Length 133 mm
Product Type Wireless Room Thermostat
Product Width 133 mm
Programme Facility 24 Hour Programmable
Switch Type SPDT
Temperature Range 5-35 °C
Total Product Weight 0.46 kg
Zoning Level One

Switch/contact rating: SPDT 10(3)A. Temperature range: 5-35°C. H x W x D: 89 x 133 x 26mm. 2 x AA batteries supplied. 30m straight line transmitter range.

Product contents

RF room unit and RF receiver box.

Downloads

Instruction Manual