Smart Thermostats

The X generation moved tado° onto Matter over Thread, which quietly removes the need for their Bridge X if your hub already acts as a Thread border router — the device that connects a Thread mesh to your home network. That makes it the cleanest integration in this list, and the ecosystem around it (Radiator Thermostat X valve heads, Heat Pump Optimizer X, wireless temperature sensors) is the most complete.

Be clear-eyed about the subscription. The hardware works fully without one, but energy reporting and “auto-assist” features like geofencing and open-window detection sit behind a monthly plan. If those are the reason you are buying, factor in the running cost.

If your boiler modulates, this is the purpose-built choice. It handles both space heating and domestic hot water — your tap water — provided the boiler has a hot water tank, which few competitors manage. Auto-Adapt factors in outdoor temperature and how quickly your house loses heat to decide when to start.

The e-paper screen is a genuinely good decision: readable from across the room at any angle, and it costs almost no power, so the AAA cells last around two years.

The Dutch pick, and the most precise: 0.1 °C steps rather than 0.5, which in a well-insulated house is the difference between comfortable and slightly-too-warm. Unusually it can also control a district-heating main valve, which matters in Dutch and Scandinavian apartment blocks where there is no boiler to talk to at all.

It ships with the Smile-T gateway, a separate box wired to the boiler that joins your network over Wi-Fi or Ethernet. That is one more thing on a shelf, but it also means the connection to the boiler is not dependent on Wi-Fi reaching the hallway.

Still the most attractive thermostat you can buy, and the learning algorithm is not marketing — it does build a reasonable schedule from how you actually behave. Sensors for temperature, humidity, light, occupancy and proximity mean it wakes up as you walk past.

The limitation is architectural: there is no TRV ecosystem, so you get one temperature for the whole house. In a flat that is fine. In a house with cold bedrooms it is a real constraint, and the cheaper Thermostat E offers the same sensors and learning in a plainer body.

A specialist, and the right answer if you have electric underfloor heating rather than radiators. It switches up to 16 A / 3680 W and uses an external NTC sensor — a thermistor probe embedded in the floor — to regulate floor temperature rather than air temperature, which is how underfloor systems are supposed to be controlled. It also acts as a Thread router.

A Scandinavian workhorse for electric heating — underfloor, panel heaters, infrared. No learning algorithms, no app theatre, just a solid Z-Wave thermostat with metering that reports into your energy dashboard. It is mains-wired into the wall box, so unless you are confident with fixed wiring this is an electrician’s job.

An interesting outlier: not a boiler thermostat at all, but a wall panel that commands SwitchBot radiator valve heads directly and treats a group of them as one zone. For a rented flat with radiators and no permission to touch the boiler, it is the cheapest legitimate route to per-room heating. You will need a SwitchBot hub in the chain.