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Honeywell CMT921 Wireless Room Thermostat

Product Code: 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
  • View more information

Product contents:
RF Room Unit and RF receiver Box

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.

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Honeywell CMT921 Wireless Room Thermostat Instruction Manual



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Honeywell CMT921 Wireless Room Thermostat 4.3 5 7 7
Very neat and easy to use Bought this to replace a faulty unit, was extremely easy to fit and a doddle to use. Very happy with both the unit and the price. 26 Mar 2015
Expensive Replacement My existing system had a Honeywell Wireless thermostat which worked very well until the display disappeared, a common problem apparently. I bought this replacement from screwfix but unfortunately it comes as a complete package, I didn't need the relay but the thermostat itself was easy to "rebind" with the existing relay so a minimum of work was required. I have since been advised that you can buy a similar thermostat at a fraction of the price of this that is more reliable but I would have had to change the relay. When this display disappears that's what Ill do!! 8 Nov 2014
elegant and workmanlike I found no difficulty in installing and setting up this thermostat even though I'm approaching 90 years of age. It does just what I want, and does it well, and from previous experience of this manufacturer's products I expect it to be very reliable. 16 Oct 2014
Easy installation Bought to replace 4 year old defective unit, where the display had all but disappeared (hopefully this will last longer). Didn't need the receiver box as existing one was ok, so could have saved some money. However, to synchronise the new unit with existing receiver was an absolute doddle (a 5 minute job that actually took 5 minutes). Unit now working perfectly & is easy to program, use & understand. 2 Oct 2013
  • 2015-08-26T14:00:38.397-05:00
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Download more info (pdf)

Brand Honeywell
Colour Beige
Display Type Digital Display
Manufacturer Guarantee 1 years
Manufacturing Standards RoHS/WEEE
Model No CMT921
Pack Size 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