Wiser Smart Room Thermostat

The Wiser Smart Room Thermostat is a wireless, battery-powered room thermostat that adds a heating zone to an existing Wiser system. It is not a starter kit. The maker describes it as an add-on for creating more zones in the buildable Wiser multi-room heating system, and it requires a Wiser Hub or HubR to work at all¹.

It is priced from £105 in white and £115 in anthracite, and it carries a 3 year warranty with no subscription fee for the Wiser Home app¹. It measures 76mm wide, 76mm high and 25mm deep, runs on 2 x AA batteries, and connects over a Zigbee mesh network rather than through wiring¹.

The thermostat is the room-sensing half of a zoning system. The hub is the half that talks to the boiler. A household buying this device on its own, without a hub already in place, has bought a sensor with nothing to control. Everything below sets out what it does, what it costs, what it depends on, and where the limits sit.

An add-on for zoning, not a starter kit

The distinction matters commercially. Wiser sells starter bundles built around a hub and a single room thermostat, and it sells the Smart Room Thermostat separately as a way to extend a system that already exists. The maker's own wording is that it creates more zones in a buildable multi-room heating system, and the product-specific application is listed as an additional smart room thermostat for the Wiser HubR¹.

A starter kit for a combi boiler is the 1 channel kit, which pairs a 1 channel HubR with a room thermostat and suits a home where heating is controlled by one central thermostat and hot water is on demand⁴. A conventional or system boiler with a cylinder takes the 2 channel route, which controls one channel of central heating and separate hot water through the Wiser Home app⁶. The 3 channel kit adds a HubR suitable for conventional boilers plus two Smart Room Thermostats⁷.

The Smart Room Thermostat is what a household adds next. Each additional thermostat creates another zone that can be scheduled and set independently, and because it is wireless it can be moved between rooms without rewiring¹. Radiator thermostats do the same job at the emitter rather than the room, and the two are designed to work together: the maker's guidance is that multi-room kits include two smart radiator thermostats to start with, with more added individually⁸.

Price, colours and what is in the box

The published price is from £105 for the white variant and £115 for anthracite, read from the maker's build-a-kit page³. The same from £105 starting figure appears on the add-on collection and the newest products listing². These are the maker's own prices, not installer quotes, and the thermostat is a retail device rather than something fitted as part of a boiler installation.

For context on what a full system costs, the 1 channel Smart Room Thermostat Kit is listed at a sale price from £210.63, and the 2 channel Smart Room Thermostat Kit at a sale price of £210.63⁵. The 2 channel Smart Room and Radiator Thermostat Kit carries a regular price of £367.78¹⁰. Those bundles include the hub, which is the part the standalone thermostat lacks.

Colour choice is cosmetic but consistent across the range: the radiator thermostat is also offered in white or anthracite, so a household extending a system can match the finish⁸. The thermostat itself is a small round-faced unit, and the table stand means it can be placed where the temperature is actually representative rather than where a cable reaches.

Specifications: dimensions, power and connectivity

The device is compact and battery-powered, which is what allows it to be moved. The maker lists dimensions of 76mm wide, 76mm high and 25mm deep, a power supply of 2 x AA batteries, and a separate devices network using Zigbee mesh technology¹. The same 76mm by 76mm by 25mm figure is repeated on the kit pages and on the Drayton product listings for the thermostat kits⁶.

The hub it depends on is a larger mains-powered unit. The HubR measures 150.8mm wide, 94mm high and 30.25mm deep and runs on 230V a.c. plus or minus 10% at 50Hz⁶. The kit pages give the radio detail: the HubR transmits at Wi-Fi +17dBm and Zigbee +12dBm, while the room thermostat transmits at +13dBm¹¹. The 3 channel kit lists Wi-Fi at 2.4GHz to IEEE802.11 b/g/n and Zigbee at 2.4GHz to IEEE802.15.4¹³.

The practical reading is that the thermostat is a low-power Zigbee device that sleeps most of the time and reports temperature and setpoint back to the hub. It does not connect to the internet itself. The hub does that. That split is why the thermostat can run for a long period on two AA cells, and why replacing the batteries is the main maintenance task a household faces with it.

How it works with the Wiser Hub and the Wiser Home app

At the centre of every Wiser system is the Wiser Hub, which allows Wiser devices to connect with the Wiser Home app¹. The thermostat wirelessly connects to that system, meaning no wiring is required, and it can be reassigned to different rooms or locations¹. The app is named Wiser Home, and there is no subscription fee for it¹.

The hub is what carries the boiler connections. A 1 channel HubR controls one channel of central heating through the app, suited to a combi⁴. A 2 channel HubR controls one channel of central heating with separate hot water control, suited to a conventional or system boiler⁶. A 3 channel HubR supports up to two channels of central heating plus optional hot water¹⁴. The thermostat itself never touches the boiler wiring; it tells the hub what the room is doing, and the hub decides what to do about it.

Independent guidance describes the same architecture: the system is made up of a Wiser Home Hub and Smart Room Thermostat, with the Wiser Multi-room Kits offering room-by-room control and Smart Radiator Thermostats offering individual control of each radiator¹⁵. That is the shape of the system, and it is worth being clear that the room thermostat and the radiator thermostat are different products doing different jobs.

The dependence this creates is worth stating plainly. Local control at the thermostat continues without an internet connection, but scheduling from outside the home, remote adjustment and any app-based automation run through the hub, the home broadband connection and the manufacturer's app. A household that wants heating control to survive a broadband outage should understand that the app layer is the part that stops working.

Zoning and scalability: up to 16 rooms and 63 devices

The system ceiling is stated consistently across the range: control up to 16 rooms using up to 63 Wiser devices per system¹. The same figure appears on the 1 channel kit, the 2 channel kit, the 2 channel room and radiator kit, the 3 channel kits, the sensor kits and the non-relay hub kit⁴.

That is a generous ceiling for a domestic property. Sixteen rooms is more than most UK homes have, and 63 devices allows a mix of room thermostats, radiator thermostats, sensors and switches. The limit is a system limit rather than a per-product one, so a household adding a second or third Smart Room Thermostat is nowhere near it.

For comparison, the WundaSmart Room Thermostat is listed as supporting up to 30 thermostats per system controlling 30 rooms or zones¹³. That is a higher ceiling, and it is included here only to show that 16 rooms is a design choice rather than a technical maximum across the category.

The scalability question a household actually faces is not the ceiling but the wiring. Each additional zone needs either a room thermostat, a radiator thermostat, or both, and each zone needs the hub to be able to call for heat independently. Where a system has zone valves, those have to exist for the zoning to mean anything at the boiler. The controls side of that is covered in heating zoning and the wiring side in heating control wiring.

Voice control and smart home integrations

The Smart Room Thermostat works with Amazon Alexa and the Google Assistant, and the same line appears across the Wiser range, including the radiator thermostat and the various kits¹. The maker's guidance describes Alexa or Google Assistant integration letting a householder check and adjust temperatures by asking¹⁸.

Room naming is handled in the app. To edit the name of any room, the Wiser Home app is used: settings, then the Rooms and Devices option¹⁹. After renaming a room, Alexa needs to be told to "Sync my devices" before the new name is recognised¹⁹. That is a small but real step, and it is the kind of thing that makes voice control appear broken when it is only out of date.

On wider smart home integration, independent guidance notes that smart thermostats generally connect to Amazon Alexa, Siri and Google Home, naming Google Nest and Hive as examples²⁰. The Wiser pages reviewed here list Alexa and Google Assistant rather than Siri or Apple Home, so a household invested in Apple's ecosystem should check current compatibility before buying rather than assume it.

The equiwatt route is separate and worth knowing about. Wiser states that the smart plug and the smart room thermostat can currently be connected to the equiwatt app, which lets them take part in powerDOWN events automatically²¹. The Electrical Heat Switch Kit is also listed as Equiwatt compatible, with the maker describing connection to the free Equiwatt app to earn rewards for saving energy²². That is a third-party demand-flexibility service sitting alongside the manufacturer's own app, and it is one of the few ways this hardware can earn something back rather than only save.

Claimed savings: up to 30% on heating bills

The saving claim attached to Wiser products is up to 30% on heating costs, described as coming from smarter scheduling and energy-saving modes⁴. The Smart Room Thermostat page states the same figure as a guideline based on BEAMA and Salford university research statistics from 2021¹.

Three things should be said about that number. It is the manufacturer's claim, not an independent measurement of this device. It is a maximum, expressed as "up to", so it describes the top of a range rather than a typical outcome. And it is based on research from 2021, which predates the energy price movements since.

Independent guidance on smart thermostats is more measured. Smart Energy GB notes that a wireless thermostat is not always smart, and that smart thermostats usually add app control, internet connectivity, automation or other connected features²³. That is a definition rather than a saving figure, and it is a useful reminder that the saving comes from the scheduling and zoning behaviour, not from the hardware itself.

What actually drives a saving in a zoned system is heating rooms that are in use rather than the whole house, and running lower flow temperatures where the emitters allow. The controls only enable that; the household has to set it up. The wider evidence on whether these systems pay back is set out in do heating controls save money, and the tariff interaction in heating controls and time-of-use tariffs.

Heat pumps, underfloor heating and other systems

Wiser states that its heating kits work with electric or water-based underfloor heating, combi or conventional boilers, and radiators or towel rails²⁴. The 2 channel kit interfaces with heat pumps via on/off controls⁶. That last point is a limit as much as a feature: on/off control is not the same as a modulating or weather-compensated connection, and a heat pump run on simple on/off signals will not get the efficiency benefit of a load-compensated control. The protocols behind that distinction are covered in OpenTherm and load compensation and modulation.

For electric underfloor heating specifically, the Wiser Electrical Heat Switch can control it, and the maker states that the Wiser Remote Floor Sensor needs to be used in addition to a Wiser Room Thermostat to protect the floor from overheating²². That is a safety condition rather than an optional extra, and it is the kind of detail that decides whether a floor can be controlled by this system at all.

The thermostat is also part of a wider sensor range. The Temperature and Humidity Sensor is described as a low-cost alternative to the room thermostat, connecting to a 2nd Generation Hub to monitor temperature and humidity remotely and automate with other Wiser devices²⁵. A household that wants monitoring without a full thermostat can use that instead, though it does not provide the same room control.

Warranty, delivery and UK customer service

The Smart Room Thermostat carries a 3 year warranty, and the kits list an extended 3 year warranty¹. The maker does not publish a longer extension for this device on the pages reviewed, so the 3 year term is the figure to work from.

Delivery is stated as an estimated 3 to 5 working days, with free delivery over £75 and free returns¹. The same terms appear across the range, including the radiator thermostat, the sensor kits and the non-relay hub kit¹⁰. Since the thermostat alone is priced from £105, it clears the £75 threshold on its own.

UK customer service runs Monday to Friday, 8am to 6pm, online and by phone, described as a highly trained technical team¹. The thermostat page also carries a customer rating of 4.30 stars from 314 verified reviews¹. That is the maker's own review platform, so it should be read as a manufacturer-hosted figure rather than an independent survey.

The dependence picture for this device is straightforward. It is a battery-powered Zigbee sensor that needs a Wiser hub, a home broadband connection for app features, and the manufacturer's app for scheduling and remote control. It keeps a household on the same boiler and the same fuel; it changes how the heat is distributed around the home, not where the heat comes from. The wider question of what local control buys and what cloud dependence costs is set out in heating controls and energy independence, and the subscription landscape across brands in smart thermostat subscriptions.