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Best room thermostat

Updated: October 2026

You want one name, and the cheapest dial and the word smart both look finished. The best room thermostat here depends on the job. If a programmer already runs the clock, the best value is the ESI mechanical dial. If this is a first tado X system and the receiver must be in the box, the top pick is the wireless starter. The [room thermostat comparison](/hub/thermostats/room-thermostat) holds the full table. This page assigns each listing to a person. The Products Compared editorial team wrote it on 16 October 2026 from those listings and public UK sources, without a lab test. A qualifying purchase through our amazon.co.uk links can earn us a commission at no extra cost to you.

You want one name, and the cheapest dial and the word smart both look finished. The best room thermostat here depends on the job. If a programmer already runs the clock, the best value is the ESI mechanical dial.

Our top picks

ESI ESI ESRTM mechanical room thermostat

Best overall

ESI ESI ESRTM mechanical room thermostat
8.8/10about £13.99
View offer
tado tado Wireless Smart Thermostat X starter

Rank 2

tado tado Wireless Smart Thermostat X starter
8.8/10about £129.99
View offer
tado tado Smart Thermostat X wired add-on

Alternative

tado tado Smart Thermostat X wired add-on
8.4/10about £79.99
View offer
On this page
  1. 1.Best for what job
  2. 2.Best value dial in this set
  3. 3.Top pick if you want an app
  4. 4.Who should leave a listing on the shelf

Best for what job

Which? discusses tado Smart Thermostat X and recommends professional installation, and it separates a hot-water version from one without. The public snippet shows no scores we can quote. amazon.co.uk’s non-programmable best-seller list is a rank, not a test, though the ESI ESRTM appears there at about £13.99. Two jobs cover this set. One is a dial where a programmer already keeps the clock. The other is an app schedule with a complete radio path to the boiler. A seven-day programmable stat is absent here. Name the job before you compare the price. The room thermostat buying guide covers that middle choice and the England combi rule.

Best value dial in this set

The ESI ESRTM (B00QGKSTD8) is about £13.99, with 4.4 from 1,139 amazon.co.uk ratings, the largest review file in the set. The bullets describe a mechanical dial with volt-free contacts and a two-wire backplate. In this set it is the best value when you already have a programmer and you want a switch. Reviews report the dial several degrees out. One buyer reseated the knob. The attribute block says Wi-Fi and BACnet, while the title and the reviews describe a dial. Buy the mechanical object the reviews describe. The livager (B0FZ4Y89KP) is the other dial, at about £15.99 with 3.8 from 19 ratings, stated from 10°C to 30°C, with a neon on the title. The neon failed for a buyer on a two-wire cable. With no manufacturer warranty on the listing, it is the weaker dial unless your cable really is two-wire and you do not need the lamp.
ESI ESI ESRTM mechanical room thermostat

Testsieger

ESI ESI ESRTM mechanical room thermostat
8.8/10about £13.99
View offer

Top pick if you want an app

The tado Wireless Smart Thermostat X starter (B0D9QBPV51) is about £129.99, with 4.4 from 286 ratings. The box lists Wireless Receiver X, the wireless sensor, a stand, and three AAA batteries. A bullet says the receiver is the border router and that no extra Bridge X is needed. The model name claims hot-water control. For a first smart system in this set, that complete box is the top pick. AI Assist is £3.99 a month or £29.99 a year, and the listing is not compatible with tado V3+. tado’s 22% and 55% lines are the maker’s copy, not a result we measured. The wired add-on at about £79.99, ASIN B0CWPG6G5W, has no Bridge X. Reviews that liked it were adding a second zone where a Thread border router was already there.

Who should leave a listing on the shelf

Leave the ESI if you came for Wi-Fi, an app, or a schedule on the stat. Leave the livager if the old cable has three conductors and you need the neon, or if you want more than 19 ratings. Leave the wired tado head if this is your first thermostat and you have no Bridge X and no other Thread border router. Leave the wireless starter if the house is still on tado V3+, or if you will not pay for the automations the advert leans on. More reviews make a complaint easier to see. They do not prove the next unit is more accurate, and they are not a bill-saving award. Pick the ESI when the programmer already does the clock. Pick the starter when the receiver must arrive in the same parcel.

Common questions

Is the ESI the best value?
In this set, yes, for a mechanical replacement. It is about £13.99 with 4.4 from 1,139 ratings, against the livager at about £15.99 with 3.8 from 19. The volt-free two-wire claim matches a simple combi call where the programmer is elsewhere. Reviews still report the scale several degrees out, and the Wi-Fi attribute line is a conflict.
Is the tado starter the top pick?
It is the top pick when you need a complete smart kit. The receiver, sensor, and three AAA batteries are in the box, at about £129.99 and 4.4 from 286 ratings. Hot-water control is claimed in the model name. AI Assist is extra, at £3.99 a month or £29.99 a year. It is the wrong pick if you still use tado V3+, or if a plain dial and a programmer already do the job.
Why not the cheaper tado wired unit?
About £79.99 buys the head, not the network. Bridge X is excluded, and Thread and Matter need it or another border router. Reviews describe easy installs where X was already in use, and they dispute a simple first Wi-Fi setup. The starter at about £129.99 is the listing that includes Wireless Receiver X.
Is the livager good enough?
It can be a cheap stand-in if you have counted two wires and you do not need the neon. The range is 10°C to 30°C, with an audible click. The limit is the evidence: 19 ratings at 3.8, a review that found three wires, a neon that stayed off on two wires, and no manufacturer warranty on the listing.
What if I already own tado V3+?
Stay on V3+ hardware. Both X listings say they are not compatible with tado V3+. A reviewer who left an unsupported Nest is a different case from a working V3+ house. If you only need a new dial beside an existing programmer, the ESI is the mechanical option here.
Does best mean the biggest saving?
No. tado’s listing lines of 22% and 55% are the maker’s copy, not a result we measured. Energy Saving Trust’s figure for turning 22°C down to 21°C is about the setpoint, about £120 a year in Great Britain and about £80 in Northern Ireland, and it is not a test of these four ASINs.

Related pages

Wired or wireless room thermostat

How to set a room thermostat

Room thermostat

Room thermostat and TRVs: who switches the boiler off

Room thermostat buying guide: dial, box and England

Sources

Public UK sources for room controls, Boiler Plus in England, siting, and gas competence. Listings are the amazon.co.uk captures for these four ASINs, not a live reload on 17 October 2026. Prices on amazon.co.uk move.

  1. Approved Document L Volume 1 (retrieved 17 October 2026)
  2. Boiler Plus factsheet (retrieved 17 October 2026)
  3. Boiler Plus final policy (retrieved 17 October 2026)
  4. Boiler Plus clarification (retrieved 17 October 2026)
  5. BEAMA siting note (retrieved 17 October 2026)
  6. Energy Saving Trust heating controls (retrieved 17 October 2026)
  7. BEIS/BRE TPI evidence (retrieved 17 October 2026)
  8. HSE L56 (retrieved 17 October 2026)