The best room thermostats, compared.
Top pick: ESI ESRTM mechanical room thermostat – Highest score in this comparison, 8.8 out of 10, from 1,139 amazon.co.uk reviews. Best value: ESI ESRTM mechanical room thermostat – About £13.99 with 4.4 from 1,139 reviews, for a two-wire dial where a programmer is already elsewhere. Updated October 2026.
A room thermostat senses the air in one room or zone and calls a boiler, heat pump, or heating circuit to run or stop. You use it for comfort and for boiler interlock, so the boiler and pump stop once that room is warm enough. A wireless kit is complete only when the receiver is in the box. A temperature display on its own is not a thermostat. The set is two mechanical dials and two tado X products. The wired tado X head is an add-on, and X is not in that box. How to match the heat source, the box, and a schedule is set out in the [room thermostat buying guide](/hub/thermostats/room-thermostat/sub/room-thermostat-buying-guide). A thermometer, a humidity display, or a 16 A electric floor-mat stat is a different product, and those were left out of this set.
A room thermostat senses the air in one room or zone and calls a boiler, heat pump, or heating circuit to run or stop.
14 products checked · 47 hrs invested · +16,800 readers
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Personal buying guide
Question 1 of 2
What do you need on the wall?
The ESI ESRTM is a mechanical room thermostat at about £13.99 that switches a heating call through volt-free contacts on a claimed two-wire cable, and the dial stores no schedule. It has 4.4 from 1,139 amazon.co.uk ratings, the largest review file in this set. Reviewers describe easy swaps for old Honeywell and Danfoss dials where a programmer already sits elsewhere. The same reviews report the scale several degrees out, plus complaints about the contacts and the screws. The attribute block says Wi-Fi and BACnet, while the title, the manufacturer line, and the reviews describe a mechanical dial, so that Wi-Fi line is a listing conflict. The marketplace brand field says WITPOCE while the manufacturer field says ESI. It will not give you an app or a weekday programme on the stat itself.
Pros
Cons
Best for: Replacing a two-wire mechanical stat where a programmer is already elsewhere.
Less suitable: Anyone who needs an app, a schedule on the stat, or Wi-Fi.
Specifications
Common questions
Is this programmable?
No. The item type is a mechanical room thermostat, and the bullets describe a dial with volt-free contacts, not a schedule.
Does it have Wi-Fi?
The attribute block says Wi-Fi and BACnet. The title, the manufacturer line, and the reviews describe a mechanical dial. Do not treat the Wi-Fi line as the product.
What wiring does the listing claim?
The bullets say a two-wire installation with volt-free contacts and an easy-fit backplate. The voltage field says 230 V.
The tado Wireless Smart Thermostat X starter is a wireless kit at about £129.99 that puts the Wireless Receiver X, the temperature sensor, a stand, and three AAA batteries in one box. Across 286 amazon.co.uk ratings it sits at 4.4. The model name claims hot-water control, and the listing claims both an OpenTherm interface and a relay, which only helps if your boiler manual already lists those terminals. Reviewers describe swaps away from Hive and from a Nest that was no longer supported. The title mentions Bridge X, while a bullet says the receiver is the border router and that no extra Bridge X is needed, so the included-components line is the check that matters. AI Assist is listed at £3.99 a month or £29.99 a year, and reviews say the headline automations sit behind that fee. It is not compatible with tado V3+, and multi-zone setup in the app drew complaints.
Pros
Cons
Best for: A first tado X system where the receiver must be in the box.
Less suitable: A house still on tado V3+, or a buyer who will not pay for the advertised automations.
Specifications
Common questions
Is the receiver in the box?
Yes. The included-components line lists Wireless Receiver X and the wireless temperature sensor. The bullet says no extra hub or Bridge X is needed.
Does the listing claim hot water control?
Yes. The model name includes a programmer with hot water control, and a bullet says the thermostat can regulate hot water when connected to a boiler.
Is AI Assist included in the £129.99?
The listing prices AI Assist at £3.99 a month or £29.99 a year. Reviews say headline automations sit behind that fee.
The tado Smart Thermostat X wired add-on is a wall head at about £79.99, about 10 cm square and 300 g, with six AAA batteries, screws, and sticky pads in the box and no Bridge X. It has 4.2 from 212 amazon.co.uk ratings. Reviews describe straightforward second-zone installs where a tado X network was already running, including a swap onto an existing wired thermostat. Thread and Matter still need that Bridge X or another Thread border router, and reviews dispute a simple first-time Wi-Fi setup. The listing names Alexa, Google Assistant, and Siri, and claims OpenTherm and a relay. Hot-water control is not stated on this listing, and the head is not a tado V3+ part. Bought as a first thermostat, it leaves you short of the radio path back to the boiler.
Pros
Cons
Best for: A second wired zone on a tado X system that already has a border router.
Less suitable: A first thermostat with no Bridge X or Thread border router in the house.
Specifications
Common questions
Does this include the Bridge X?
No. The bullet says Matter and Thread need the Bridge X, which is not included, or another Thread border router. Reviews repeat that a further device is required for Wi-Fi.
Can it replace a wired thermostat?
The title calls it a wired room thermostat, and reviews describe swaps onto an existing wired stat. It is still an X add-on, not a V3+ part.
Does the listing name Alexa?
Yes. A bullet names Amazon Alexa, Google Assistant, and Apple Siri, and the controller-type field lists Amazon Alexa, Google Assistant, and iOS.
The livager mechanical room thermostat is a white dial at about £15.99, listed from 10°C to 30°C, with an audible click as the knob passes the current temperature and a neon indicator claimed on the title. It has 3.8 from only 19 amazon.co.uk ratings. Short reviews call it an easy replacement. One review says the neon stayed off because the boiler cable had only two wires, and another buyer used a spare conductor from a three-wire stat to light it, so the two-wire advert and the wire count do not match every install. The listing states no manufacturer warranty. There is no schedule on the knob. Treat the neon as optional unless you have already counted the conductors in the existing cable.
Pros
Cons
Best for: A cheap mechanical stand-in where the existing cable really is two-wire and the neon is optional.
Less suitable: A three-wire backplate, or a buyer who needs the indicator to light on a two-wire boiler cable.
Specifications
Common questions
Does the neon work on two wires?
The title claims a neon indicator. One review says the light stayed off because the boiler cable had only two wires. Another buyer used a spare conductor from a three-wire stat to light it.
Is it programmable?
No. The control type is a mechanical knob, and no schedule is stated.
What temperature range does the listing give?
The bullet says 10°C to 30°C, with an audible click as the knob passes the current temperature.
Shelf prices, stars, and review counts are the amazon.co.uk figures stored for these four listings. They are not a live reload on 17 October 2026. The number on each card is the stored 0–100 figure for this set, which here is the star line times 20. It is not a laboratory test and not a measured gas saving. The top pick and the best value are the awards already on those listings. Listing limits and review faults stay in the written assessment. The weights below are the buying checks used to read the set.
Heat source and switching
25%The product has to call the heating, not only show a temperature. A volt-free relay is the usual on/off call. OpenTherm only helps if the boiler manual already lists those terminals. A line that names both still means you use the terminals the boiler supports.
What is in the box
25%A starter includes the receiver. An add-on head needs that network already. The wireless tado X listing puts Receiver X in the box. The wired tado X head leaves Bridge X out. tado X does not mix with tado V3+.
Schedule
20%A mechanical dial does not store weekdays. Time control sits in a programmer elsewhere or in the app. Both tado X listings claim an app schedule. The dials in this set do not.
Siting and the England rule
15%About 1.5 m in free air, not in a room that already has TRVs. When a gas combi is installed in an existing dwelling in England, one extra measure applies. That paragraph does not name a brand, and it is not the rule in Scotland, Wales, or Northern Ireland.
Reviews and shelf price
15%Stars and review volume from the amazon.co.uk line, with the captured shelf price kept beside them. This set runs from about £13.99 to about £129.99. A thin review sample stays visible in the score.
Start with whether it switches heating, then the boiler terminals, then whether the receiver is in the box. A star rating does not tell you those three. The four listings are amazon.co.uk pages, with the prices and review counts stored for this comparison, not a live reload on 17 October 2026. A mechanical dial does not store a weekday programme.
A room thermostat senses the air in one room or zone and calls a boiler, heat pump, or heating circuit to run or stop. You buy one for comfort and for boiler interlock, so the boiler and pump stop once that room is warm enough. A mechanical dial only switches. A smart stat also handles time. A wireless kit is complete only when the receiver is in the box. A thermometer, a humidity display, or a 16 A electric floor-mat stat is a different product, and those were left out of this set.
The wired tado X head needs a Bridge X or another Thread border router, and that piece is not in the box. Bought as a first thermostat, it leaves you short of the radio path back to the boiler. The wireless starter is the kit that lists Receiver X. tado X does not mix with tado V3+.
The ESI ESRTM and the livager knob only switch the heating call. Time control sits in a programmer elsewhere or in the app. Setting the dial to 30°C does not heat the house faster. Both tado X listings claim an app schedule, and AI Assist on the starter is a paid extra.
The ESI attribute block says Wi-Fi and BACnet. The title, the manufacturer line, and the reviews describe a mechanical dial. Do not treat that Wi-Fi line as the product. The marketplace brand field says WITPOCE while the manufacturer field says ESI.
Decide the job before the brand. The product has to switch heating. A volt-free relay is the usual on/off call. OpenTherm, named on both tado X listings, only helps if the boiler manual already lists those terminals. A line that names both still means you use the terminals the boiler supports. A starter includes the receiver. The wireless tado X box lists Wireless Receiver X, the sensor, a stand, and three AAA batteries, at about £129.99, with 4.4 from 286 reviews.
Site the stat at about 1.5 m in free air, not above a radiator, in sun, a draught, a corner, or a room that already has TRVs. Approved Document L Volume 1, for England, describes a thermostat in one room and a TRV on every other emitter, with no TRV in the thermostat’s room, when a boiler is replaced. TRVs alone do not interlock the boiler. A new gas combi in an existing dwelling in England needs one extra measure. That can be a smart thermostat with automation and optimisation.
Three typical situations, each with a recommendation from this comparison.
A programmer already sits elsewhere, and you only need the room to call the boiler. The ESI ESRTM is the high-review mechanical option here, at about £13.99, with 4.4 from 1,139 reviews. It stores no schedule. Reviews report the scale several degrees out.
You need the receiver in the box. The tado Wireless Smart Thermostat X starter is the only complete receiver kit in this set, at about £129.99. Budget for AI Assist if you want the advertised automations, at £3.99 a month or £29.99 a year. It does not mix with tado V3+.
A tado X network or another Thread border router is already at home. The wired Smart Thermostat X is the add-on, at about £79.99, with six AAA batteries and no Bridge X. Skip it if that border router is not already there.
The top pick is the tado Wireless Smart Thermostat X starter, at about £129.99, for a first tado X system where the receiver has to be in the box. It has 4.4 from 286 reviews. The listing claims hot-water control, OpenTherm, and a relay, and AI Assist is a paid extra. The best value is the ESI ESRTM, at about £13.99, with 4.4 from 1,139 reviews, when a programmer already sits elsewhere and you only need a two-wire dial. It stores no schedule, and one attribute line that says Wi-Fi does not match the dial. The wired tado X head is a second zone, not a first thermostat. The card score is the stored star conversion, not a laboratory test.
ESI ESRTM mechanical room thermostat
Highest score in this comparison, 8.8 out of 10, from 1,139 amazon.co.uk reviews.
ESI ESRTM mechanical room thermostat
About £13.99 with 4.4 from 1,139 reviews, for a two-wire dial where a programmer is already elsewhere.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
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.
This page contains affiliate links to amazon.co.uk. If you buy through them, we may earn a commission at no extra cost to you. Prices, stars, and review counts come from those listings. We did not run a laboratory test. The scores rank a listing inside this set only.
