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7 Best Cm921 Replacement - May 2026

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Last Updated: 27-05-2026

1

best-choiceTop Product
TotalHome - Wireless Room Thermostat & Receiver (Honeywell/Resideo) CM927 CM921 CM727 CM721 CMS927 CMS927B1049 (Mk2 Replacement) (TTHWFP)

TotalHome - Wireless Room Thermostat & Receiver (Honeywell/Resideo) CM927 CM921 CM727 CM721 CMS927 CMS927B1049 (Mk2 Replacement) (TTHWFP)

TotalHome

9.8

9.8

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2

LavaTap Pro Honeywell Wireless Programmable Thermostat CM927 CM921 CM727 Replacement 7 Day Central Heating Programmer Boiler Plus Compliant White Standard

LavaTap Pro Honeywell Wireless Programmable Thermostat CM927 CM921 CM727 Replacement 7 Day Central Heating Programmer Boiler Plus Compliant White Standard

LavaTap

9.6

9.6

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3

best-valueBest Value
Honeywell-Resideo Totalhome CM927 CM921 CM727 CM721 CMS927 CMS927B1049 (Mk 3 Replacement) Wireless Room Thermostat & Receiver TTHWFP - Hanicks

Honeywell-Resideo Totalhome CM927 CM921 CM727 CM721 CMS927 CMS927B1049 (Mk 3 Replacement) Wireless Room Thermostat & Receiver TTHWFP - Hanicks

Hanicks

9.5

9.5

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4

Hanicks Honeywell-Resideo TotalHome CM927 CM921 CM727 CM721 CMS927 CMS927B1049 (Mk3 Replacement) Wireless Room Thermostat & Receiver Kit TTHWFP

Hanicks Honeywell-Resideo TotalHome CM927 CM921 CM727 CM721 CMS927 CMS927B1049 (Mk3 Replacement) Wireless Room Thermostat & Receiver Kit TTHWFP

Hanicks

9.2

9.2

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5

Plumbhub-Wireless Programmable Thermostat Replacement for CM927 CM921 CM727 CM721 CMS927B1049 with Relay Box Central Heating Programmer - White

Plumbhub-Wireless Programmable Thermostat Replacement for CM927 CM921 CM727 CM721 CMS927B1049 with Relay Box Central Heating Programmer - White

Plumbhub Plumbing and Heating Supplies

9.1

9.1

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6

LavaTap Pro Honeywell Wired Programmable Thermostat CM907 CM901 CM707 CM701 Replacement Central Heating 7 Day Programmer Boiler Plus Compliant

LavaTap Pro Honeywell Wired Programmable Thermostat CM907 CM901 CM707 CM701 Replacement Central Heating 7 Day Programmer Boiler Plus Compliant

LavaTap

8.8

8.8

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7

Honeywel T4R Wireless 7 Day Programmable Thermostat Y4H910RF4003 (Replaces ‎CM927 CMS927 CM921 CMS921 CM727 CM721) Genuine Part - Hanicks

Honeywel T4R Wireless 7 Day Programmable Thermostat Y4H910RF4003 (Replaces ‎CM927 CMS927 CM921 CMS921 CM727 CM721) Genuine Part - Hanicks

Hanicks

8.6

8.6

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