The best smart radiator valves, compared.
Top pick: WILAWELS TRV601W Wi-Fi head Best value: SONOFF TRVZB Zigbee head – About £22.30, the lowest eligible shelf price, with several named adaptors and 4.1 from 936 reviews, when a Zigbee coordinator is already in the house. Updated October 2026.
A smart radiator valve is a motorised thermostatic head for a wet central-heating radiator in a UK home. It replaces the numbered head, not the brass body, the lockshield, or the boiler. You judge a listing by the radio and hub you already own, whether the batteries and the bridge are in the box, and whether that brand can ask the boiler for heat. A head on its own does not start the boiler. tado X does not join a tado home. A Wi-Fi field is not the same as no hub. The hub, the adaptor, and the boiler question are set out in the [smart radiator valve buying guide](/hub/thermostats/smart-radiator-valve/sub/smart-radiator-valve-buying-guide). You use one when a room overheats while the existing timer still runs the boiler, or when a house already on, tado, or needs a matching head.
A smart radiator valve is a motorised thermostatic head for a wet central-heating radiator in a UK home. It replaces the numbered head, not the brass body, the lockshield, or the boiler.
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Personal buying guide
Question 1 of 2
Is a hub or coordinator already at home?
The WILAWELS listing at about £22.99 names the model TRV601W while the model-number field says TRV706W, the same number as the other WILAWELS ASIN, and the weight here is 240 g against 220 g on that other page. amazon.co.uk shows 5.0 from five reviews. Two short English reviews say installation was easy and that the head connects without a separate gateway, and one reviewer would buy again, though they also say use had only just started. One review says the heads did not fit until an extra part was ordered. The page claims six daily slots, a 1.5 °C window drop within five minutes, child lock, and anti-frost, and it asks about boiler compatibility and Google Home without answering either. Thread size and battery life are not stated, and the mounting field says wall mount although the product is a radiator head. Five reviews, with a model-number clash, are too small to treat this as the same product as the TRV706W listing or as proven boiler control. The stored 5.0 is star arithmetic. It does not outrank Hive or tado.
Pros
Cons
Best for: One low-priced Wi-Fi head if you can return it when the adaptor does not match your valve.
Less suitable: A multi-radiator order, a Google Home house, or anyone who needs the model number to match the name on the box.
Specifications
Common questions
Is this the same model as TRV706W?
The model name is TRV601W and the model-number field is TRV706W. Treat them as separate listings until the page is consistent.
Does it say it works with the boiler?
The listing asks whether it is compatible with the boiler and does not answer. There is no boiler-receiver claim.
Did reviewers say it fitted?
Two English reviews say installation was easy. One review says the heads did not fit until an extra part was ordered.
The WILAWELS TRV706W is listed at about £26.99 as a Wi-Fi head with no gateway claimed, up to six schedule slots a day, and a window rule that pauses heating after a 1.5 °C drop within five minutes. amazon.co.uk shows 5.0 from three reviews. One of those reviews is in English and calls the price competitive, the head quiet, and the app schedule usable, though it does not cover a full heating season. The other two reviews are not in English, and none of the three names a thread size, a battery life, or a failed unit. The listing says it suits most standard valves and includes complete accessories, without a parts list, and it does not state power or voltage. Child lock, anti-frost, and calibration from −10 °C to +10 °C in 0.1 °C steps are claims on the page, not findings from a large UK sample. A 5.0 from three reviews, two of them not in English, is too thin to rank against Hive’s 2,283. The card score is that star line times 20. It was not eligible for the top pick or the best value.
Pros
Cons
Best for: A trial of one direct Wi-Fi head if three reviews are enough for you to test a single radiator.
Less suitable: A whole-house buy, or anyone who needs a named thread and a battery figure before ordering.
Specifications
Common questions
Does the listing say you need a hub?
No. The bullet says no gateway, with Wi-Fi and Alexa control.
How long do the batteries last?
The listing asks the question and does not answer it. Power and voltage are not in the specification block.
Which radiator thread does it fit?
The bullet says most standard valves. No thread size is printed, and the three reviews do not name one.
The Hive head, model UK7004240, replaces one existing TRV head for about £55.30 and, when the M30 or Danfoss RA adaptor matches, reviewers describe the swap as a few minutes. amazon.co.uk shows 4.2 from 2,283 reviews, the largest count in this set, and several whole-house installs use it to leave unused bedrooms off while the rest of the heating runs. The listing says the valves work without Hive Active Heating, and reviews describe Heat on Demand once a Hive thermostat is also installed. That boost can also heat other radiators on the same zone that have no smart head. The Hive Hub is not in the box, and the bullet treats it as essential for wireless control and for Alexa. Temperature at the valve is a repeated complaint: one room sat at about 30 °C while the valve read 12 °C. In a 16-radiator house, open and close took on the order of tens of minutes, and one buyer saw a Heat on Demand request in the app while the receiver did not fire the boiler. The battery fields disagree, with 2 x 9V in one field and 2 x AA on the components line, and an M28 adaptor is a separate Hive request that one buyer waited up to two weeks for. The card score is the stored star line, not a laboratory test.
Pros
Cons
Best for: A house that already has a current Hive hub, where you want one radiator on its own schedule.
Less suitable: A room that needs a fast close, an M28 body, or boiler control from this box alone.
Specifications
Common questions
Is the Hive Hub in the box?
No. The bullet says a Hive Hub is required for wireless control and Alexa. Included parts are the head, M30 and Danfoss RA adaptors, and two AA batteries.
Which valve bodies do the adaptors cover?
The components line names M30 and Danfoss RA. Reviews say an M28 adaptor is a separate Hive request and is not in this box.
Can this head start the boiler by itself?
Not from the parts in the box. Reviews describe a Heat on Demand option when a Hive thermostat is also installed, and say that boost can heat other radiators on the zone that have no smart head.
The tado X starter kit puts two radiator heads and a Bridge X on Matter over Thread, at about £207.15. Across 1,165 amazon.co.uk reviews at 4.2, buyers who already had a matching valve body describe a clear app setup, and some hold a bedroom near the set temperature instead of letting it overheat. The touch screen and the knob work without the phone. The box includes adapter sets for both heads and a UK mains adapter. The same carton does not include a boiler receiver, so the kit cannot start the boiler by itself. Open-window detection, geofencing, holiday mode, and cost insights sit under AI Assist at £3.99 a month or £29.99 a year. Thread heads drop off the network in more than one report, including a pairing that worked only after a head was moved closer to the router, and one buyer had two valves fail, one inside a month and one after 12 months. The listing says tado X will not join a V3+ or older home, and one reviewer found the schedule starts at the set time rather than warming the room beforehand. This is the top pick when you want the bridge in the carton and you already have another way to call the boiler. The card score is the stored star line, not a laboratory test.
Pros
Cons
Best for: A first tado X pair when you want the Bridge X in the same carton and you already have another way to call the boiler.
Less suitable: A V3+ house, or a buyer who needs the boiler receiver and open-window control inside the about £207.15.
Specifications
Common questions
Does this kit include a boiler receiver?
No. The included-components line lists two Smart Radiator Thermostat X heads, a Bridge X, adapter sets, and mains adapters. A reviewer also says a receiver is a separate purchase.
Will it work with tado V3+?
The listing says tado X products are not compatible with tado V3+ or older.
Is open-window control included in the price?
The listing places geofencing, open window detection, holiday mode, and cost insights under AI Assist at £3.99 a month or £29.99 a year.
The Kasa KE100 is a single add-on head at about £26.99 with an RA adaptor, a cover opener, and two AA batteries in the box. amazon.co.uk shows 4.2 from 463 reviews. Reviewers who already own a KH100 describe Kasa app schedules and, in two reports, a reaction within about 10 to 15 seconds. Many say the head fitted with no extra adaptor. The bullet still requires a Kasa Hub KH100, which this listing does not include, and the connectivity field says Wi-Fi even though the hub is the control path. Open-window shut-off needs a separate Tapo T110, and the app line says the valve does not work with the Tapo app. Bedroom noise comes up more than once, the supplied AA cells are called poor, and plastic adaptors have cross-threaded. One valve would not close during the off hours. It is the value case only when a KH100 is already owned, so it does not take the best value place from the SONOFF. The card score is the stored star line, not a laboratory test.
Pros
Cons
Best for: An extra radiator if you already run a Kasa KH100 and the body takes the RA adaptor.
Less suitable: A first buy with no hub, a bedroom, or a valve body that is not RA.
Specifications
Common questions
Does the KE100 work without a hub?
No. The bullet says the KE100 requires a Kasa Hub KH100, and that hub is not in the included parts.
Is open-window detection in the box?
The bullet says the valve shuts when a connected Tapo T110 window sensor activates. That sensor is not listed as included.
Which adaptor is supplied?
The included-components line names one RA adapter, plus a cover opener and two AA batteries.
This listing is three KE100 heads at about £80.97, which is about £26.99 a head, the same shelf price as the single add-on. Number of items is 3, and a line says the bullets apply to each unit. The 4.2 from 463 reviews matches the single KE100 ASIN, and the stored review text overlaps, so that count is not a separate three-pack sample. Reviews in that shared file still say a plug-in Kasa hub is required, yet this page’s bullets do not name the KH100 or list the included parts, batteries, or adaptors. Praise in the shared text covers schedules across rooms and a faster reaction than Hive in one comparison. The same texts cite motor noise even with night mode, cross-threaded adaptors on four valves in one review, and one of three valves that would not stay closed after calibration. Power is not stated on this ASIN. The card score is the stored star line, not a laboratory test.
Pros
Cons
Best for: Three radiators when you already own a KH100 and you accept that the review file is shared with the single head.
Less suitable: A buyer who needs a parts list on this page, or a set of bedroom radiators.
Specifications
Common questions
How many valves are in this listing?
Number of items is 3 and the unit count is 3. A line says the bullets apply to each unit in the pack.
Does this page say a hub is included?
No. The bullets do not name the KH100. Reviews on the same file say a plug-in Kasa hub is required.
Are the 463 reviews only for the three-pack?
The rating count matches the single KE100 ASIN and the review text overlaps. Do not treat it as a separate sample.
The SONOFF TRVZB is a Zigbee 3.0 add-on head at about £22.30, claimed for an M30 x 1.5 mm thread, with adaptors marked CAL, RAVL, RAV, M28, and GIA in the box. amazon.co.uk shows 4.1 from 936 reviews. Many of the stored texts fit it to Home Assistant through Zigbee2MQTT, and one comparison calls it quieter than some alternatives, though more than one review still finds the motor too loud for a bedroom. The on-device display is useful without a phone, and one multi-valve install still had alkaline cells full after about a month. The head does not include the three AA batteries, and eWeLink needs a SONOFF Zigbee hub such as ZBBridge-P, ZBBridge-U, NSPanel Pro, or iHost. Pairing with Home Assistant needed the batteries out and the button held in one report, eWeLink instructions are called poor, and one reviewer says the valve is effectively on or off rather than a gradual close. It is not described as a native partner for a Nest thermostat, and child lock is asked on the listing and left unanswered. This is the best value when a Zigbee coordinator is already in the house. The card score is the stored star line, not a laboratory test.
Pros
Cons
Best for: A Home Assistant or eWeLink house that already has a Zigbee 3.0 coordinator.
Less suitable: A bedroom, a Nest-only setup, or a buyer who wants batteries and a hub inside the about £22.30.
Specifications
Common questions
Are batteries included?
No. The bullet says the TRV does not include 3 AA batteries. The voltage field is 4.5 volts.
What hub does the eWeLink app need?
The bullet says a SONOFF Zigbee 3.0 hub such as ZBBridge-P, ZBBridge-U, NSPanel Pro, or iHost. Home Assistant via Zigbee2MQTT is a separate claim.
Which valves does it say it fits?
The bullet says M30 x 1.5 mm, and the box lists adapters marked CAL, RAVL, RAV, M28, and GIA.
Shelf prices, stars, and review counts are the amazon.co.uk figures stored for these seven listings on 16 October 2026. They are not a live reload. The number on each card is that star line times 20, on a 0–100 scale shown here out of 10. A stored 100 from three or five reviews is star arithmetic on a thin sample and was not eligible for either award. The score does not add a hub in the box or a boiler receiver. It is not a laboratory test and not a measured gas saving. The weights below are the buying checks used to read the set.
Radio and hub generation
25%tado X does not join tado V3+. Hive needs a current Hive Hub or Hub 360, not the original Hub 1. The KE100 needs a Kasa KH100 and is not Zigbee. SONOFF TRVZB needs a Zigbee coordinator. A Wi-Fi field is not the same as no hub.
Valve body and adaptors
20%A thermostatic body, not a manual wheelhead and not an electric radiator. Hive states its valves do not suit electric heating. A head swap is the DIY case only when the pin moves freely. Named adaptors in the box beat an unnamed “most standard valves” line.
Whether the boiler is called
20%A head alone does not start the boiler. Hive documents Heat on Demand with a Hive thermostat. A tado community reply says a tado head will not ask a Hive controller for heat. The tado X carton here has no receiver.
Real price of the set
20%Head, missing hub, batteries, adaptors, and any plan. tado lists AI Assist at £3.99 a month or £29.99 a year for geofencing, open window, and related automations. The KE100 calls geofencing free and still leaves the KH100 off the add-on.
Review volume
15%Stars and review counts from the amazon.co.uk line. Hive is 4.2 from 2,283 reviews. WILAWELS is 5.0 from three reviews and 5.0 from five, with a model-number clash. Those two rows do not outrank Hive or tado.
Start with the valve body, then the hub or radio you already own, then whether one room must call the boiler. A star rating does not tell you those three. The seven listings below are amazon.co.uk pages, with the prices and review counts stored on 16 October 2026, not a live reload. A head does not replace the boiler control, and a manufacturer saving percentage is not a measured result for your home.
A smart radiator valve is a motorised thermostatic head for a wet central-heating radiator. It replaces the numbered head. It does not replace the brass valve body, the lockshield, or the boiler. You use one when a room overheats while the existing timer still runs the boiler, or when a house already on Hive, tado, Kasa, or Zigbee needs a matching head.
These listings replace a thermostatic head. They do not convert a manual wheelhead, and Hive states its valves do not suit electric heating. If the pin does not move freely, or the body leaks, that is a heating engineer’s job, not a head swap.
Hive radiator valves need the current Hive Hub or Hub 360, not the original Hub 1, and the hub is not in this box. tado X does not join tado V3+. The KE100 needs a Kasa KH100. A Wi-Fi line on the three-pack spec is not a no-hub claim.
Hive Heat on Demand can boost a Hive thermostat, and that call can heat other radiators on the same zone that have no smart head. A tado head will not ask a Hive controller for heat. Closed smart heads are not a boiler-off command.
Match the system before the star line. tado X uses Matter over Thread and, in this set, includes Bridge X. It does not join V3+. Hive uses its hub, which is not in the valve box, and the supplied adaptors are M30 and Danfoss RA. An M28 adaptor is a separate request. The KE100 uses a Kasa KH100, includes an RA adaptor and two AA cells on the single listing, and is not Zigbee. SONOFF is Zigbee 3.0, claims M30 x 1.5 mm, and ships several named adaptors, without the three AA cells.
Decide whether one room must start the boiler. None of these cartons is a boiler receiver. Hive documents Heat on Demand only with a Hive thermostat. tado’s help says a tado head will not ask a Hive controller for heat. Then add the missing pieces to the shelf price: hub, batteries, adaptors, and tado AI Assist at £3.99 a month or £29.99 a year if you want open window and geofencing. A TRV head is not, by itself, the extra Boiler Plus measure on a gas combi in an existing English home.
Three typical situations, each with a recommendation from this comparison.
You want two heads and the Bridge X in the same carton, and you already have another way to call the boiler. The tado X starter is about £207.15, with 4.2 from 1,165 reviews. It will not join a V3+ home, and open window sits on AI Assist.
A Zigbee 3.0 coordinator is already in the house. The SONOFF TRVZB is the best value at about £22.30, with 4.1 from 936 reviews, M30 x 1.5 mm claimed, and several named adaptors. Three AA batteries are extra, and more than one review finds the motor too loud for a bedroom.
You want one radiator on its own schedule and the hub is already there. The Hive head is about £55.30, with 4.2 from 2,283 reviews, and M30 and Danfoss RA adaptors are in the box. The hub is not. Heat on Demand needs a Hive thermostat as well.
The top pick is the tado X starter kit with Bridge X, at about £207.15, for a new tado X pair when the bridge should be in the carton and the boiler is already called another way. It has 4.2 from 1,165 reviews. There is no boiler receiver in the box, open window sits on AI Assist, and tado X will not join a V3+ home. The best value is the SONOFF TRVZB, at about £22.30, with 4.1 from 936 reviews, when a Zigbee coordinator is already in the house. Three AA batteries are extra, and more than one review finds the motor too loud for a bedroom. The KE100 at about £26.99 is the value case only when a KH100 is already owned. Two WILAWELS listings show 5.0 from three and five reviews and were not eligible for either award. The card score is the stored star line times 20, not a laboratory test.
SONOFF TRVZB Zigbee head
About £22.30, the lowest eligible shelf price, with several named adaptors and 4.1 from 936 reviews, when a Zigbee coordinator is already in the house.
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 Boiler Plus in England and for room controls when a boiler is replaced. Listings are the amazon.co.uk captures for these seven ASINs on 16 October 2026, not a live reload. Prices on amazon.co.uk move. Manufacturer saving percentages are not a result from this comparison.
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.
