Bosch Radiator Thermostat II [+M]

The controls are a better reason to buy than the badge

Bosch's Radiator Thermostat II [+M] gets the everyday interaction right on paper: a rotary control, a backlit temperature display and a light ring that indicates an adjustment. Someone without the app can change the temperature at the radiator. The display can rotate for a different mounting direction, and its brightness and illumination time are adjustable.

Those settings remain accessible through the device's menu when using Matter. So do the temperature offset, child lock and timed boost. Choosing direct Matter does not reduce the hardware to an untouchable remote-controlled valve.

The 87 × 51 × 51 mm body is still a noticeable electronic attachment. Two replaceable AA batteries are convenient if you prefer swapping cells to charging a pack. Bosch's battery-life estimate was tested with its own controllers, so it is not a measured promise for a different Matter system.

The stronger case is a room with an inconvenient routine

This valve earns its cost in a bedroom, office or spare room that needs different temperatures at different times. Bosch's system offers room schedules and window-related heating services. Direct Matter provides thermostat controls, while scheduled changes need to come from the chosen platform; Bosch's own schedule interface does not move with the valve.

That makes the surrounding heating system important. A standalone radiator valve can restrict the hot water flowing through its radiator, but cannot make an unrelated boiler produce heat. The physical fitting matters too: this replaces a thermostatic head on an M30 × 1.5 valve, with Danfoss RA and RAVL adapters supplied. It does not replace the water-carrying valve body or make every older fitting suitable.

The newer heating services have an ongoing cost

Bosch now offers automatic heat-distribution optimization through Home+, alongside demand-based control for compatible Bosch or Buderus heat pumps. These may be worth considering for unevenly heated rooms or a suitable connected heating system. They are Bosch-system services, not extras that appear simply by adding the valve to Apple Home or another Matter app.

The German Home+ price is €4.99 a month, or €59.88 over twelve monthly payments. Basic Bosch schedules do not require that upgrade. We would pay for it to address a specific heating problem, rather than assume the subscription will save more than it costs.

The separately sold, installer-supplied [+M] PRO version includes permanent access to those heating functions. That is a different offer; the ordinary retail valve reviewed here does not include it.

The price favors selective upgrades

Bosch's German store listed one valve at €84.95 and three at €249.95 on September 10, 2026, including VAT. The three-pack saves only €4.90 against singles. Two packs reach €499.90 before any controller or other accessories, so start with the rooms where a new routine will matter.

Tado Radiator Thermostat X is a less expensive comparison at its checked €64.99 German offer, with a rechargeable pack and its own heating platform. Eve Thermo is attractive for account-free stored schedules and AA batteries.

Buy Bosch for its physical controls and the Bosch heating services you actually want. A working older Bosch valve already handling the same schedule is worth keeping; direct Matter alone is a weak reason to replace the whole house.