Radiator Valves · Head to head

Bosch Smart radiator thermostat II [+M] vs Shelly BLU TRV

Full Smart Radiator Valves comparison in 2026

Updated October 2026
Data from Amazon and official Bosch and Shelly sites.
2026 verdict
On the radiator both valves run on two AA cells, but the Bosch Smart radiator thermostat II [+M] is the stronger smart radiator valve, with Matter, frost protection and a child lock.
Bosch Smart radiator thermostat II [+M]
Winner
Bosch Smart radiator thermostat II [+M]

Last recorded price

Currently unavailable on Amazon USA
See on Amazon USA
It is the better reviewed of the two and works with Google Home, Alexa, Apple Home, SmartThings and Home Assistant, joining over Zigbee through a hub or over Thread through a border router. The Shelly BLU TRV answers with a two-year warranty against one and support for an external Shelly BLU temperature sensor, which keeps readings honest when the valve sits in the radiator's heat. It needs a Shelly BLU Gateway and has no Apple Home, Matter, frost protection or child lock. Both show the temperature on a display, last about two years per set of batteries and schedule manually. Choose the Bosch Smart radiator thermostat II [+M] for Apple Home, Matter or a home with children, and the Shelly BLU TRV if accurate room readings through an external sensor matter most.
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FeatureBosch Smart radiator thermostat II [+M]Shelly BLU TRVWinner
Warranty1 year2 yearsShelly BLU TRV
IntegrationsGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterGoogle Home, Alexa, Samsung SmartThings, Home AssistantBosch Smart radiator thermostat II [+M]
Frost ProtectionYESNOBosch Smart radiator thermostat II [+M]
Child LockYESNOBosch Smart radiator thermostat II [+M]
Rating4.14.1Tie
Battery Life2 years2 yearsTie
ConnectivityZigbee, Thread Protocol2.4 GHz WiFi, BluetoothTie
ScreenYESYESTie
SensorsTemperatureTemperatureTie
GeofencingNONOTie

What the differences mean

How it connects

The Bosch Smart radiator thermostat II [+M] joins a Zigbee hub or a Thread border router and speaks Matter. The Shelly BLU TRV uses Bluetooth to a Shelly BLU Gateway that must stay powered and within range for remote and voice control.

Apple Home and Matter

The Bosch Smart radiator thermostat II [+M] works with Apple Home and Matter as well as Google Home, Alexa, SmartThings and Home Assistant. The Shelly BLU TRV covers Google Home, Alexa, SmartThings and Home Assistant only.

External temperature sensor

The Shelly BLU TRV can use a Shelly BLU H&T or door and window sensor for its reading, so it regulates to the room rather than to the warm air around the radiator. The Bosch relies on its own built-in sensor.

Safety features

The Bosch Smart radiator thermostat II [+M] adds frost protection for unheated rooms and a child lock that disables the buttons on the valve. The Shelly BLU TRV has neither.

Warranty

The Shelly BLU TRV is covered for two years and the Bosch Smart radiator thermostat II [+M] for one.

Which one to buy if

Winner
Bosch

Bosch Smart radiator thermostat II [+M]

Prime exclusive deal

Last recorded price

Currently unavailable on Amazon USA
See on Amazon USA
  • + Integrations: Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter
  • + Frost Protection: YES
  • + Child Lock: YES
  • - Warranty: 1 year vs 2 years
Shelly

Shelly BLU TRV

Prime exclusive deal
$64.99

Last recorded price

Buy on Amazon USA
  • + Warranty: 2 years
  • - Integrations: Google Home, Alexa, Samsung SmartThings, Home Assistant vs Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter
  • - Frost Protection: NO vs YES

What owners say

Owners of both valves describe fitting them on the radiator as quick. Bosch Smart radiator thermostat II [+M] owners single out a housing that feels sturdier than the first Bosch generation, app control from anywhere and the freedom to use it with Google Home, Alexa, Apple Home, SmartThings or Home Assistant, and they value frost protection and the child lock. Their complaints are friction with third-party Matter bridges, occasional disconnects after setup and a Zigbee install code hidden in the battery compartment. Shelly BLU TRV owners praise quiet, accurate regulation, the radiator adapters in the box and a gateway link they find more stable than hubs they used before, while noting the gateway must stay powered, Alexa can respond inconsistently and the built-in reading drifts with radiator heat unless an external sensor is paired.

Price history compared

Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.

  • Bosch Smart radiator thermostat II [+M]
  • Shelly BLU TRV

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Frequently Asked Questions

Which is better overall: Bosch Smart radiator thermostat II [+M] or Shelly BLU TRV?

The Bosch Smart radiator thermostat II [+M]. It adds Matter and Apple Home, frost protection and a child lock, and it is the better reviewed. The Shelly BLU TRV wins on warranty and on external sensor support.

What is the biggest difference between the Bosch Smart radiator thermostat II [+M] and the Shelly BLU TRV?

Connectivity. The Bosch Smart radiator thermostat II [+M] uses Zigbee or Thread and supports Matter, while the Shelly BLU TRV uses Bluetooth through a Shelly BLU Gateway and has no Matter support.

Does the Bosch smart TRV work without a Bosch hub?

The Bosch Smart radiator thermostat II [+M] needs either a Zigbee hub or a Thread border router, and through Matter it works with Google Home, Alexa, Apple Home, SmartThings and Home Assistant. Owners note that pairing with non-Bosch Matter bridges can take more effort.

How long do the batteries last in these radiator valves?

About two years in both. The Bosch Smart radiator thermostat II [+M] and the Shelly BLU TRV each run on two AA batteries.

Who should buy the Bosch Smart radiator thermostat II [+M]?

Homes on Apple Home or Matter, families with children and anyone who wants frost protection in rooms that sit unheated.

Who should buy the Shelly BLU TRV?

Shelly users and anyone who wants the valve to regulate from an external room sensor, with a two-year warranty.

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