Radiator Thermostat Comparison · UK 2026
Kasa KE100 vs Aqara Radiator Thermostat E1

Specs, pros and cons compared side by side

Both the Kasa KE100 and the Aqara Radiator Thermostat E1 are smart radiator heating controls. This head-to-head sets them side by side using the specs, pros and cons from our full reviews. Kasa specs come from Tapo and TP-Link’s own pages; Aqara specs come from our Aqara review, checked against Aqara’s own pages.

Quick verdict

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Kasa KE100

Pick it for: Sub-GHz link to the KH100 hub and the Kasa app (the E1: Zigbee 3.0 and an Aqara Zigbee hub)

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Aqara Radiator Thermostat E1

Pick it for: Window-open detection built in, closing the valve for 30 minutes (the KE100: needs a Tapo T110) · Works with HomeKit through the hub (the KE100: Alexa and Google)

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Quick comparison

Spec Kasa KE100 Aqara Radiator Thermostat E1
Connection Sub-GHz to the KH100 hub Zigbee 3.0
Hub or bridge needed Kasa Hub KH100 Aqara Zigbee hub
Power 2x AA alkaline 2 x AA, up to 1 year
Valve fit M30 x 1.5; RA, RAV, RAVL adapters M30 x 1.5; RA, RAV and RAVL adapters included
Smart home Alexa, Google HomeKit, Alexa, Google, IFTTT through the hub
Kasa KE100

Pros

  • Works offline once set up
  • Adapters included
  • Open-window detection with a T110
  • Tapo sensors can correct the temperature

Cons

  • Needs the KH100 hub (sold in the KIT)
  • Uses the Kasa app, not Tapo
  • Tapo does not say it controls a boiler
Aqara Radiator Thermostat E1

Pros

  • Adapters for common Danfoss valves in the box
  • Can read the room temperature from a separate Aqara sensor
  • Window-open detection and anti-freeze protection
  • Works with HomeKit, Alexa and Google Assistant through the hub

Cons

  • Needs an Aqara Zigbee hub
  • Not for manual valves, return temperature limiters or monotube systems
  • Matter support is not available yet

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Which should you buy?

Why choose the Kasa KE100

  • Sub-GHz link to the KH100 hub and the Kasa app (the E1: Zigbee 3.0 and an Aqara Zigbee hub)
Why choose the Aqara Radiator Thermostat E1

  • Window-open detection built in, closing the valve for 30 minutes (the KE100: needs a Tapo T110)
  • Works with HomeKit through the hub (the KE100: Alexa and Google)

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