Last updated: 31 October 2026 · Originally published March 2026 · By SHUK Editorial
Detailed evidence snapshot: 30 August 2026. Buying routes checked: 17 October 2026. Prices, stock, subscriptions and product support can change. Confirm every commercial destination, exact model and current offer before buying.
How we evaluated: This research-led comparison uses dated manufacturer product, support and compliance sources. It was not hands-on tested by Smart Home UK and is not a property-specific wiring verdict.
Choose a smart thermostat by heating layout before brand. A combi boiler, a system boiler with a hot-water cylinder, a two-zone S-plan or Y-plan installation and water-based underfloor heating can need different receivers, channel counts and wiring. Check the exact boiler model and control interface before buying: relay and OpenTherm support does not imply support for proprietary systems such as eBUS or EMS. If the work touches fixed mains, the boiler, a receiver, a programmer or zone valves, use a competent, suitably qualified installer.
Which UK kit fits the job? Model comparison refreshed 31 October 2026. Start with the equipment you are replacing: an existing wired room thermostat, a wireless receiver/programmer, or a multi-channel heating system. Those are different purchases. A low-priced temperature sensor, TRV or receiver on its own is not necessarily a starter kit. The earlier August tables remain dated evidence; the buying choices here distinguish the newer tado kits from the older bundles.
tado X wireless UK starter kit, 2nd generation — shortlist for wireless control and compatible stored hot water. The UK pack combines the PR04 Programmer X with the SU05 wireless sensor. The Programmer provides the Thread border-router role, so another Bridge X is not a basic missing part. Choose this route when you need a receiver at the boiler and a separately placed temperature sensor. Confirm the boiler interface, cylinder and valve arrangement with your installer; a product-family match does not approve a particular S-plan or Y-plan installation. The receiver is fixed-wired 230V equipment.
tado documents relay/OpenTherm support, device-stored schedules and core app scheduling. Its optional AI Assist features are a separate buying decision. The sensor is rechargeable; the manufacturer’s box list excludes a USB-C charging cable. Count any required charging equipment in your total rather than assuming the starter kit contains everything.
tado X wired starter kit, 2nd generation — shortlist for an existing compatible wired room thermostat. This pack contains the RU05 thermostat and IB02 Bridge X. The thermostat uses the existing control wiring; the included Bridge supplies the network connection and the manufacturer lists EU/UK plug provision. Select the UK supply at checkout. It is not the wireless UK Programmer kit and does not add a separate hot-water-cylinder channel.
The published wired-control route covers relay/OpenTherm and compatible water-based underfloor heating. It is not permission to connect the thermostat directly to a mains electric floor-heating load. Check the actual controller and load requirements first. tado X first- and second-generation devices can share an X home, but X cannot be added to a V3+ home. For an existing V3+ installation, price an appropriate expansion against a whole-system change before replacing working equipment.
Official wired kit and UK power provision · Check generation and exact kit contents
Drayton Wiser 2nd-generation 1-channel room kit — shortlist for compatible combis and planned room control. The manufacturer bundle contains one 1-channel HubR and one room thermostat. HubR supports relay and OpenTherm; it is powered by 230V AC, 50Hz, while the room unit uses two AA batteries. No separate gateway or paid subscription is required for this kit. Drayton documents expansion with radiator controls, so buy those only for rooms you intend to control.
The selected official-store variant showed sold out on 31 October; this is a stock-check route, not an in-stock promise. One heating channel does not supply separate cylinder scheduling. If you have stored hot water or two physical heating zones, use the channel matrix below and have the 2- or 3-channel design confirmed. Do not assume their OpenTherm capability matches the 1-channel model.
Hive Thermostat — shortlist for a supported Hive installation or an installer-led receiver choice. Hive’s current product page offers heating and hot-water control, with OpenTherm restricted to compatible combi boilers. That does not turn an older single-channel relay receiver or a dual-channel receiver into an OpenTherm receiver. Check the receiver reference and existing hub before buying; the detailed matrix below separates these routes.
Compare the complete kit and installation quote, rather than the thermostat headline price. The manufacturer separates schedules and heating boost from optional Hive+ features. If an installation offer includes a free first year of Hive+, check renewal and cancellation terms before counting the offer as a saving. Extra radiator valves are a room-control choice, not a requirement for every central-thermostat purchase.
Nest Learning Thermostat 3rd generation UK/EU — compare carefully when keeping an existing Heat Link system. Google’s European version uses Heat Link for boiler control and supports compatible domestic hot-water and OpenTherm routes. The North American thermostat is electrically different and is not a substitute. Match the UK/EU thermostat, Heat Link and seller’s bundle; do not buy a display-only listing as a complete system.
This is older hardware. Check condition, warranty and current manufacturer support before choosing it for a new installation. There is no reason to replace a working setup simply because a newer-looking US product appears in search results. The comparison below also separates UK/EU Thermostat E, which does not provide a separate cylinder schedule.
Google’s European versus North American hardware explanation
Before ordering: record the boiler make/model, existing receiver, hot-water cylinder and physical zones; compare the installed kit cost plus required room controls, 36-month optional plans and consumables. Keep any unquoted installation amount visible. Use the heating checker to organise the questions, then have fixed-wiring and boiler work assessed by a suitably qualified installer. A compatible controller is useful only when its receiver, valves and room controls can follow the intended call-for-heat route.
Current UK smart-thermostat shortlist
How to use this table: the prices and stock observations below were recorded on 30 August 2026, not today. In particular, the tado X rows describe first-generation kits. Use the buying options above for the separately identified 2nd-gen kits and current retailer offers.
| Exact UK product | Best-fit use | Hot-water-cylinder control | OpenTherm | Hub or controller | Subscription | Observed state on 30 August 2026 |
|---|---|---|---|---|---|---|
| tado° Wireless Smart Thermostat X Starter Kit with UK Programmer | current tado option for compatible combi systems and common one-heating-zone plus cylinder layouts | yes, with the included UK Programmer X where compatible | yes, on compatible boilers | PR04 Programmer X included; it is also the Thread Border Router | core use without payment; optional AI Assist £3.99/month or £29.99/year | £129.99 promotional price observed; PR04 + SU04 exact kit; recheck basket and eligibility |
| tado° Wired Smart Thermostat X Starter Kit | replacing a compatible wired thermostat or controlling a water-based underfloor-heating zone | no separate cylinder channel in this kit | yes, on compatible boilers | Bridge X included | core use without payment; optional AI Assist £3.99/month or £29.99/year | £119.99 promotional price observed for RU04 + IB02; recheck basket and eligibility |
| Hive Thermostat, current dial model | mainstream UK option with receiver variant matched to the heating layout | yes with dual-channel receiver; schedules or boosts the cylinder but does not set tank temperature | compatible combi boilers and one OpenTherm zone only | Hive Hub required for app and remote features unless already owned | core thermostat use does not require Hive+; Hive+ £3.99/month or £39.90/year is optional | thermostat/receiver £119 and Hub £80 observed; exact receiver and installation remain unresolved |
| Drayton Wiser 2nd Generation, 1 Channel | combi boiler or one compatible heating channel | no separate cylinder channel | yes on the 1 Channel HubR | 2nd Generation HubR included | no subscription fee | £257.80 selected variant observed; sold out |
| Drayton Wiser 2nd Generation, 2 Channel | one heating zone plus stored hot water | yes | no; official page specifies relay | 2nd Generation 2 Channel HubR included | no subscription fee | £257.80 selected variant observed; sold out |
| Drayton Wiser 2nd Generation, 3 Channel | two heating zones plus optional stored hot water | yes, where configured | no; official page specifies relay | 2nd Generation 3 Channel HubR included | no subscription fee | £372.80 selected variant observed; sold out |
| Google Nest Learning Thermostat, 3rd generation UK/EU with Heat Link | Google ecosystem alternative for a compatible UK system | yes, through the UK/EU Heat Link where compatible | yes | Heat Link included | no thermostat subscription | £219 and Buy observed on Google UK |
| Google Nest Thermostat E UK/EU with Heat Link E | combi-focused lower-cost Nest option | no cylinder schedule; keep the existing hot-water programmer | yes, on compatible combi systems | Heat Link E included | no thermostat subscription | £199 and Add to basket observed; current exact UK page states a two-year limited warranty |
| tado° V3+ UK hot-water starter kit | existing-home expansion or clearly labelled clearance/value option | yes with the correct UK receiver | model-specific | V3+ Internet Bridge included | optional Auto-Assist £3.99/month or £29.99/year | £89.99 promotional price observed; BP02 relay is verified, but OpenTherm and proprietary-bus support are not established by the current exact product page |
Boiler and wiring compatibility
| Home or system question | tado X | Hive | Wiser 2nd Gen | Nest UK/EU |
|---|---|---|---|---|
| Combi boiler | relay or OpenTherm when the exact boiler is compatible | most gas/LPG combis; OpenTherm only on a compatible single-zone combi | use 1 Channel; relay or OpenTherm where compatible | 3rd gen or E may work by relay/OpenTherm after the Google check |
| System or heat-only boiler | use the correct receiver/programmer and confirm wiring | use the correct conventional-system receiver | select 1, 2 or 3 channels from the actual heating/hot-water layout | 3rd-gen Heat Link can support compatible layouts |
| Stored hot water | Wireless X with UK Programmer can schedule and boost | dual-channel receiver schedules and boosts; it does not set tank temperature | 2 Channel for one heating zone plus cylinder, or 3 Channel for two zones plus optional cylinder | 3rd gen can control a compatible cylinder; Thermostat E cannot schedule it |
| S-plan or Y-plan | confirm valves, cylinder thermostat and wiring in the tado checker | confirm the dual-channel receiver and wiring with the installer | 2/3 Channel are the relevant relay products; confirm the actual plan and valves | Google documents 3rd-gen examples, but professional confirmation is still required |
| Proprietary boiler bus | do not infer eBUS or EMS support; X covers fewer non-OpenTherm modulating systems than V3+ | do not generalise; Hive publishes an exclusion list | no native proprietary-bus claim | do not infer eBUS or EMS support |
| Underfloor heating | Wired X can control a compatible water-based zone; not mains electric underfloor heating | wet or hydronic supported; electric underfloor heating not supported | separate hydronic and electrical add-ons have their own limits | check the exact Heat Link system; no blanket claim |
| Installation boundary | app setup may be DIY; fixed receiver/programmer wiring requires competence | Hive recommends an experienced tradesperson | HubR fixed wiring must meet current requirements | Google recommends professional installation for 3rd gen; E only where existing wiring and system are clearly compatible |
Dated product-system compatibility record
Evidence boundary, checked 30 August 2026: this is research-led buying guidance from manufacturer product, support and compliance sources. Smart Home UK did not inspect the property, boiler terminals, wiring or hydraulic layout and did not run installation, latency or outage tests. No named professional reviewed this page. Every positive result below remains conditional until the exact boiler model, existing controls, receiver and zone/hot-water layout are recorded; a family-level interface match is not an unconditional compatibility verdict.
Record those inputs in the boiler/thermostat compatibility and ownership-cost checker before choosing a kit.
| Exact kit and receiver/controller | Exact boiler model | Relay / OpenTherm / proprietary-bus interface | Hot water and zones | Call-for-heat route | Internet/local boundary | Dated evidence and unresolved conflict |
|---|---|---|---|---|---|---|
| tado Wireless X, PR04 + SU04; PR04 is the controller and Thread Border Router | NOT_CAPTURED — checker required | Relay or OpenTherm at family level; proprietary non-OpenTherm buses are not a general claim | One heating output; combi demand or one cylinder schedule/60-minute boost channel | SU04 or mapped SRT X → Thread → PR04 → relay/OpenTherm → boiler or wiring centre | Downloaded schedules and device buttons are manufacturer-documented locally; remote and AI functions need internet | 2026-08-30 · checker required · exact boiler and existing controller not captured · firmware not published |
| tado Wired X, RU04 + IB02; RU04 is wired controller, IB02 is Thread Border Router | NOT_CAPTURED — checker required | Relay or OpenTherm at family level; proprietary non-OpenTherm buses are not a general claim | One directly wired heating/UFH zone; no separate cylinder channel | RU04 → relay/OpenTherm → boiler or zone actuator | Downloaded schedule and device control are manufacturer-documented locally; remote and AI functions need internet | 2026-08-30 · checker required · exact boiler and relay details not established by the current product page |
| tado V3+ UK hot-water kit, BP02 + SU02 + IB01 | NOT_CAPTURED — checker required | Relay verified on the exact page; OpenTherm and proprietary-bus support are NOT_PUBLISHED for this exact BP02 page | One heating output plus on/off cylinder schedule/boost | SU02 → legacy tado radio with powered IB01 → BP02 → relay → boiler/wiring centre | Manual control remains; remote app fails without internet; schedule continuation varies by region/hardware revision | 2026-08-30 · checker required · X devices cannot join this V3+ home · firmware not published |
| Hive single-channel relay; actual SLR1c/SLR1d and thermostat label must be captured | NOT_CAPTURED — exact negative exclusions listed below | Dry zero-volt or 230 V relay; no OpenTherm on this receiver; no general proprietary-bus claim | One heating channel; combi hot water on demand; no cylinder channel | SLT3 family → Hive Zigbee system → SLR1 → relay → boiler | Thermostat/receiver operation is documented during internet loss while the powered local system survives; app remote is lost | 2026-08-30 · family only · current retail page does not expose the shipped receiver variant |
| Hive OTR1 single-channel receiver | NOT_CAPTURED — exact negative exclusions listed below | OpenTherm or standard relay; OpenTherm only for a compatible single-zone combi; no general proprietary-bus claim | One OpenTherm heating zone; no separate cylinder channel; multizone OTR1 must use relay mode | SLT3 family → Hive Zigbee system → OTR1 → OpenTherm/relay → boiler | Local thermostat/receiver operation is documented during internet loss; app remote is lost | 2026-08-30 · checker required · exact boiler terminals and single-zone layout not captured |
| Hive dual-channel relay; actual SLR2c/SLR2d label must be captured | NOT_CAPTURED — exact negative exclusions listed below | Two 230 V relay outputs; no OpenTherm; no general proprietary-bus claim | One heating plus one cylinder channel; special gravity/part-pumped behaviour must be recorded | SLT3 family → Hive Zigbee system → SLR2 → heating/hot-water relays → wiring centre, valves and boiler | Local thermostat/receiver operation is documented during internet loss; app remote is lost | 2026-08-30 · family only · hydraulic plan and exact receiver not captured |
| Wiser 2nd Gen 1 Channel, CCTFR6311G2D + room thermostat | NOT_CAPTURED — checker required | Relay or OpenTherm; exact boiler check required; no general proprietary-bus claim | One heating channel; no separate cylinder channel; up to 16 logical rooms | Room thermostat/SRT → Zigbee → CCTFR6311G2D HubR → relay/OpenTherm → boiler | In-home phone/direct-device control is manufacturer-documented without internet; outside-home control is lost | 2026-08-30 · checker required · sold out · app 7.6.0 / HubR 4.48.2 |
| Wiser 2nd Gen 2 Channel, CCTFR6312G2D + room thermostat | NOT_CAPTURED — family-level route only | Two relay channels; no OpenTherm; no general proprietary-bus claim | One heating plus one cylinder channel | Thermostat/SRT → Zigbee → CCTFR6312G2D HubR → heating/hot-water relays → wiring centre, valves and boiler | In-home phone/direct-device control is manufacturer-documented without internet; outside-home control is lost | 2026-08-30 · family only · sold out · app 7.6.0 / HubR 4.48.2 |
| Wiser 2nd Gen 3 Channel, CCTFR6313G2D + two room thermostats | NOT_CAPTURED — family-level route only | Three relay channels; no OpenTherm; no general proprietary-bus claim | Two heating channels plus optional cylinder channel | Two thermostats/SRT groups → Zigbee → CCTFR6313G2D HubR → two heating relays and optional hot-water relay → wiring centre | In-home phone/direct-device control is manufacturer-documented without internet; outside-home control is lost | 2026-08-30 · family only · sold out · app 7.6.0 / HubR 4.48.2 |
| Nest Learning Thermostat 3rd Gen UK/EU with model-matched Heat Link; A0001/A0003 regulatory family | NOT_CAPTURED — checker required | On/off relay or OpenTherm; exact boiler check required; no general proprietary-bus claim | One thermostat/Heat Link per physical zone; one separate-cylinder on/off channel | Thermostat → direct Thread or wired link → Heat Link → relay/OpenTherm → boiler | Wi-Fi loss removes app remote; local thermostat changes and Heat Link heating/hot-water buttons are documented | 2026-08-30 · checker required · regulatory index does not map each component · firmware not published |
| Nest Thermostat E UK/EU with Heat Link E; A0131/A0132 regulatory family | NOT_CAPTURED — checker required | On/off relay or OpenTherm; exact check required; no general proprietary-bus claim | One physical heating zone; no separate cylinder channel; retain the existing cylinder programmer | Thermostat E → direct wireless Thread → Heat Link E → relay/OpenTherm → boiler | Wi-Fi loss removes app remote; local thermostat and Heat Link E manual heating control are documented | 2026-08-30 · checker required · exact component mapping and firmware not published |
Documented exact Hive exclusions
Hive explicitly lists these Worcester Bosch models as incompatible with Hive Active Heating: ICC2 ZWBR 11-37A (4710810), CRD 537i (4710811), CRD 542i (4710812), Greenstar HE Plus ZWBR 7-28A (4731156), Greenstar HE Plus ZWBR 11-35A (4731157), C Greenstar 30 HE Plus Combi (4731175), C Greenstar 35 HE Plus L Combi (4731176), C Greenstar R 30HE Plus (4731179), C Greenstar R 35HE Plus (4731180) and C Greenstar R 40HE Plus (4731181). Honeywell SmartFit controls and a Vaillant VR65 control centre are conditional exclusions unless the manufacturer-specified removal work is completed by a competent engineer. This is exact negative evidence; it does not make every unlisted boiler an exact positive match. Source HIVE-03, checked 2026-08-30.
Three-year ownership cost: dated known floors
Do not apply these August kit prices to the new tado 2nd-gen links. For a 2nd-gen purchase, total the current kit price + required extras + installation quote + 36 months of your chosen plan + charging accessories. The included Bridge X or UK Programmer covers the listed kit’s basic hub requirement. Both 2nd-gen room devices are rechargeable. Cable inclusion differs between the Amazon wired listing and the manufacturer’s box list: verify it with the seller rather than assuming it is included.
The same 36-month formula is used throughout: hardware + required hub/storage + installation + subscription + mandatory consumables. “Known floor” means unresolved installation or battery/accessory costs are not silently converted to £0. Paid/comparable uses the optional annual-plan basis recorded on 30 August 2026 where one exists; plan feature sets differ, so price alone is not a feature-equivalence ranking.
| System, checked 2026-08-30 | Hardware | Required hub/storage | Installation | 36-month plan | Mandatory consumables | Free/core known floor | Paid/comparable known floor |
|---|---|---|---|---|---|---|---|
| tado Wireless X PR04 + SU04 | £129.99 promotional | £0 included | £140 current postcode-dependent offer | £0 core / £89.97 AI Assist annual basis | AAA replacement cost unknown | £269.99 + batteries | £359.96 + batteries |
| tado Wired X RU04 + IB02 | £119.99 promotional | £0 included | Unknown | £0 core / £89.97 AI Assist annual basis | AAA replacement cost unknown | £119.99 + installation/batteries | £209.96 + installation/batteries |
| tado V3+ BP02 + SU02 + IB01 | £89.99 promotional | £0 included | Unknown | £0 core / £89.97 Auto-Assist annual basis | AAA replacement cost unknown | £89.99 + installation/batteries | £179.96 + installation/batteries |
| Hive thermostat/receiver + Hive Hub | £119 | £80 Hub | Unknown | £0 core / £119.70 Hive+ annual basis | Four-AA replacement cost unknown | £199 + installation/batteries | £318.70 + installation/batteries |
| Wiser 2nd Gen 1 Channel | £257.80; sold out | £0 included | Unknown | £0 | Two-AA replacement cost unknown | £257.80 + installation/batteries | Same; no required paid plan |
| Wiser 2nd Gen 2 Channel | £257.80; sold out | £0 included | Unknown | £0 | Two-AA replacement cost unknown | £257.80 + installation/batteries | Same; no required paid plan |
| Wiser 2nd Gen 3 Channel | £372.80; sold out | £0 included | Unknown | £0 | Four-AA replacement cost unknown | £372.80 + installation/batteries | Same; no required paid plan |
| Nest Learning Thermostat 3rd Gen UK/EU + Heat Link | £219 | £0 | Unknown | £0 | No mandatory routine consumable identified | £219 + installation | Same; no thermostat plan |
| Nest Thermostat E UK/EU + Heat Link E | £199 | £0 | Unknown | £0 | Two AA lithium L91 replacements unresolved | £199 + installation/batteries | Same; no thermostat plan |
Version and sources: matrix version 2026-08-30.1; source IDs TADO-01–13, HIVE-01–08, WISER-01–11 and NEST-01–09 are resolved in the dated heating source ledger. Prices, stock, plan terms, firmware and support can change.
What can a smart thermostat save?
A smart thermostat does not create a guaranteed cash saving. It can reduce avoidable heating by improving schedules, setback, room control or boiler modulation, but the result depends on the previous control baseline, occupied hours, fabric efficiency, weather, tariff and installation. tado’s 22% and Google’s 10–12% figures are manufacturer claims, not Smart Home UK measurements. Compare products on compatibility and controls first; estimate money only from the home’s heating-energy use, not from the whole Ofgem typical-use cap.
UK verdict
There is no safe universal winner. Start with the heating layout. tado Wireless X is the principal current tado candidate when the correct UK Programmer is compatible; Hive is the mainstream UK service option but the receiver, hub and OpenTherm limits matter; Wiser is the clearest route to channel-based and room-by-room control, subject to current kit stock. Google’s UK/EU Nest 3rd gen and Thermostat E remain ecosystem alternatives. tado V3+ belongs in a legacy/value box, and the North American Nest 4th Gen and Ecobee do not belong in the normal UK boiler shortlist.
Frequently asked questions
Which smart thermostat is best for a UK combi boiler?
Choose only after checking the exact boiler interface. tado Wireless X, Hive, Wiser 1 Channel and both UK/EU Nest models can work with compatible combis, but their OpenTherm, proprietary-bus, hub and installation rules differ.
Can I install one myself?
App pairing and ordinary configuration can be DIY. Work on fixed mains, a boiler receiver, programmer or zone valves should be completed by someone competent and suitably qualified; Google specifically recommends professional installation for the UK/EU Nest Learning Thermostat 3rd generation.
Does tado require a subscription?
No for core use. AI Assist on tado X and Auto-Assist on older ranges are optional at £3.99/month or £29.99/year, checked 30 August 2026.
SHUK Editorial — Research-led UK smart-home guidance using public manufacturer and authoritative sources. Editorial identity · Research method and corrections.