Radiator Valves · Head to head

Aqara Radiator Thermostat E1 vs Bosch Smart radiator thermostat II [+M]

Full Smart Radiator Valves comparison in 2026

Data from Amazon and official Aqara and Bosch sites.
2026 verdict
A radiator valve's job is to meter hot water into one radiator, and the Bosch Smart radiator thermostat II [+M] is the stronger head.
Bosch Smart radiator thermostat II [+M]
Winner
Bosch Smart radiator thermostat II [+M]

Last recorded price

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It runs longer on the same two AA cells, 2 years against 1, and it adds Thread beside the Zigbee hub both need. The Aqara Radiator Thermostat E1 is the one with geofencing and an external temperature sensor. Child lock is documented on the Bosch head and not published for the Aqara. Both show the temperature on a screen and both include frost protection. Pick the Bosch Smart radiator thermostat II [+M] for cross-platform heat control, and the Aqara Radiator Thermostat E1 when an outside sensor and geofencing matter more.
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FeatureAqara Radiator Thermostat E1Bosch Smart radiator thermostat II [+M]Winner
Rating3.94.1Bosch Smart radiator thermostat II [+M]
Battery Life1 year2 yearsBosch Smart radiator thermostat II [+M]
ConnectivityZigbeeZigbee, Thread ProtocolBosch Smart radiator thermostat II [+M]
GeofencingYESNOAqara Radiator Thermostat E1
Warranty1 year1 yearTie
IntegrationsGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterTie
ScreenYESYESTie
SensorsTemperatureTemperatureTie
Frost ProtectionYESYESTie

What the differences mean

Battery life

Both radiator valves take two AA cells. The Bosch Smart radiator thermostat II [+M] is rated for 2 years. The Aqara Radiator Thermostat E1 is rated for 1 year. That is a full heating season of difference before you are back on a ladder with a screwdriver, and it is one of the reasons the Bosch head wins the sheet.

Thread and Zigbee

Both need a Zigbee hub. Only the Bosch Smart radiator thermostat II [+M] also uses Thread, and that path needs a Thread border router. The Aqara Radiator Thermostat E1 has no Thread radio. Day to day, the Bosch head can sit on either network. The Aqara head stays on Zigbee.

Sensors and geofencing

The Aqara Radiator Thermostat E1 can use an external temperature sensor and has geofencing. The Bosch Smart radiator thermostat II [+M] has neither, so it trusts the sensor in the head and does not ramp heat because your phone left the house. If the radiator itself warms the reading, the Aqara path is the one that can move the sensor into the room.

Which apps need a hub

Alexa, Apple Home, Google Home and Matter are listed as built in on the Bosch Smart radiator thermostat II [+M]. On the Aqara Radiator Thermostat E1 those four need an Aqara hub. Home Assistant and SmartThings are supported on both. Child lock is yes on the Bosch head. It is not published for the Aqara, so it is not scored as missing. Warranty is 1 year on both.

Which one to buy if

What owners say

Owners of both radiator valves say the head goes on the valve quickly and that app control of a single radiator is the point. They praise different extras. Aqara Radiator Thermostat E1 owners single out an external temperature sensor, geofencing that warms the room before they arrive, and frost protection, and a share of long-term users report motors, mounting splines or Zigbee pairing wearing out after a year or two. Bosch Smart radiator thermostat II [+M] owners single out a sturdier housing than the previous Bosch head and wide app control, and they complain that Matter pairing is smoother on Bosch's own hub than on someone else's, and that the Zigbee install code sits inside the battery bay.

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.

  • Aqara Radiator Thermostat E1
  • Bosch Smart radiator thermostat II [+M]

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Frequently Asked Questions

Which is better overall: Aqara Radiator Thermostat E1 or Bosch Smart radiator thermostat II [+M]?

The Bosch Smart radiator thermostat II [+M]. It wins on a 2-year battery rating against 1 year, and on Thread as well as Zigbee. The Aqara Radiator Thermostat E1 is the pick if you need geofencing or an external temperature sensor.

What is the biggest difference between these radiator valves?

Battery life and the extra radio, against the external sensor. The Bosch Smart radiator thermostat II [+M] is rated for 2 years on two AA cells and adds Thread. The Aqara Radiator Thermostat E1 is rated for 1 year, needs only Zigbee, and can use an external temperature sensor plus geofencing.

Does the Bosch Smart radiator thermostat II [+M] work with Matter and Apple Home?

Yes. Matter, Apple Home, Alexa and Google Home are listed on the Bosch head itself. The Aqara Radiator Thermostat E1 needs an Aqara hub for those four. Both work with Home Assistant and SmartThings, and both still need a Zigbee hub.

Which radiator valve supports an external temperature sensor?

The Aqara Radiator Thermostat E1. The Bosch Smart radiator thermostat II [+M] does not. Both have their own temperature sensor and a screen, and both include frost protection.

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

Buyers who want one radiator valve across Alexa, Apple Home, Google Home, SmartThings, Home Assistant and Matter, with Thread as well as Zigbee and a 2-year battery rating.

Who should buy the Aqara Radiator Thermostat E1?

Aqara or Home Assistant households that want geofencing and an external temperature sensor on a Zigbee radiator valve, and that can live with a 1-year battery rating.

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