Honeywell Home (Resideo)
Honeywell Home evohome Base Pack (ATP921R3100)
- Wi-Fi
Verified September 2026
Still the gold standard for true 12-zone UK heating, and the built-in evohome integration is actively maintained. But the £246 Base Pack is just the controller, relay box, stand and power supply — no TRVs included. Each extra zone needs an HR92 wireless radiator head at roughly £84, so a 4-5 zone house easily doubles the kit cost before fitting. It also needs a heating engineer to wire the relay box into the boiler and zone valves, not a weekend DIY job. Skip it for a flat or single-zone terrace; evohome earns its price on larger homes needing genuine per-room scheduling across 8-12 zones.
In Home Assistant
| Control | Type | What it does |
|---|---|---|
| Zone climate (up to 12) | Climate entity per zone | Target temperature per room |
| System mode | Service call (evohome.set_system_mode) | Whole-house mode such as Auto or Away — the standard preset service doesn't reliably work here |
| Hot water | Water heater entity | On/off control for domestic hot water, if fitted |
The system's climate entity for the controller itself has no real setpoint — HA fabricates one as the average of every zone's temperature, so don't automate off it directly. A confirmed open bug means once you set a non-default preset (e.g. Away) there's no way back to normal scheduling through the standard preset service — you have to call evohome.set_system_mode instead, which is also the entity worth automating: trigger a whole-house AutoWithEco setback across all 12 zones at once when the last person leaves, something only meaningful because evohome's controller genuinely governs every zone together.
Specs
- installation
- Wiring the relay box to the boiler and zone valves needs a qualified heating engineer — not a DIY install
- zones supported
- Up to 12 heating zones plus domestic hot water
- trv battery life
- Up to 2 years per HR92 head (2x AA)
- hot water control
- Supported via the BDR91 relay, using an optional hot water kit for a dedicated DHW zone
- trv compatibility
- Honeywell Home HR92 wireless radiator controller heads, ~£84 each; multi-head zoning kits (4 or 8 HR92s) sold separately, e.g. Plumbing Superstore's EVOPACK5 bundle
- wireless protocol
- 868MHz two-way RF between controller, relay box and HR92 heads — proprietary Honeywell Home protocol, not Zigbee/Z-Wave
- base pack contents
- ATC928G3000 Wi-Fi controller, table stand, power lead, BDR91 wireless relay box — no TRV heads included
- base pack price gbp
- 246