Aqara
Aqara Radiator Thermostat E1
- Zigbee2MQTT / ZHA
- Local control
- Zigbee
Prices verified October 2026
See more thermostats & heating picks on our Amazon storefront →Our verdict
Sits squarely between our two other TRVs on price and finish: around £43, about £17 more than the SONOFF TRVZB but £17 less than the Bosch Radiator Thermostat II. Pairs straight into Zigbee2MQTT or ZHA (model SRTS-A01) with no Aqara hub needed — fully local, no cloud dependency. Two AA batteries are rated around a year under typical use, better than the SONOFF's roughly six months but well short of the Bosch's two years. Fits M30x1.5mm valves directly, with Danfoss RA/RAV/RAVL adapters included. A sensible middle ground if the SONOFF feels too plasticky but the Bosch's price tag feels excessive for what it is.
What can Home Assistant control on the Aqara Radiator Thermostat E1?
| Control | Type | What it does |
|---|---|---|
| Target temperature | Number | Set the heating setpoint |
| Preset | Selector (manual/away/auto) | Choose the operating mode |
| Window open | Binary sensor | Built-in detection of a sudden temperature drop — no separate contact sensor needed |
Zigbee2MQTT exposes the valve's own window_open detection as a binary attribute — built into the TRV's firmware from a sudden temperature drop, not a separate contact sensor — so an automation can drop the setpoint to away/eco the moment a window opens with zero extra hardware. Worth knowing if you're on ZHA rather than Zigbee2MQTT: climate.turn_off doesn't fully retract the valve into true off/summer mode there, a gap that doesn't exist on the Zigbee2MQTT path.
Specs
| dimensions | Φ57 x 89mm |
|---|---|
| battery type | 2x AA (LR6) alkaline, not included; ~1 year typical life per Aqara (vs ~6 months on SONOFF, ~2 years on Bosch) |
| zigbee version | Zigbee 3.0 |
| temperature range | 5-30°C setpoint range (rated operating environment 0-40°C) |
| valve adapter compatibility | Fits M30x1.5mm valves directly; adapters included for Danfoss RA, RAV and RAVL |
How does the Aqara Radiator Thermostat E1 compare?
| Product | From | Protocol | Local control | Integration |
|---|---|---|---|---|
| Aqara Radiator Thermostat E1 (this product) | £54.98 | Zigbee | Yes | Zigbee2MQTT / ZHA |
| Aqara Floor Heating Thermostat W500 | £69.98 | Matter, Thread, Zigbee | Yes | Native |
| Aqara Radiator Thermostat W600 | £49.99 | Matter, Thread, Zigbee | Yes | Native |
| Bosch Smart Home Radiator Thermostat II | £65.01 | Zigbee | Yes | Zigbee2MQTT / ZHA |
Frequently asked questions
- Does the Aqara Radiator Thermostat E1 work with Home Assistant locally?
- Yes. The Aqara Radiator Thermostat E1 is controlled locally in Home Assistant through Zigbee2MQTT or ZHA, so it keeps working if your internet connection or the Aqara cloud goes down. Control and state updates stay on your own network.
- Which protocol does the Aqara Radiator Thermostat E1 use, and do I need a hub?
- The Aqara Radiator Thermostat E1 uses Zigbee. To pair it with Home Assistant you need a Zigbee coordinator (for example a SkyConnect/ZBT-1 or Sonoff dongle) attached to your Home Assistant host. Aqara's own hub is not required when you integrate through Zigbee2MQTT or ZHA.
- How much does the Aqara Radiator Thermostat E1 cost in the UK?
- The lowest price we have listed for the Aqara Radiator Thermostat E1 is £54.98 at Smart & Secure Centre, with other UK retailers at up to £54.98. Prices were last checked in October 2026 and change often, so confirm on the retailer's page before buying.