Honeywell Home evohome Wi-Fi Connected Thermostat Pack (ATP921R3100) review
A large or awkward home being zoned properly by a heating engineer.
By Tom Calder
The most capable system here — Resideo quotes up to 12 individually time- and temperature-controlled heating zones plus a separate domestic hot water zone, and the broadest system support of anything on this page, covering most boiler types, heat pumps, district heating, pellet burners and S-plan or Y-plan zone-valve setups. But the pack as sold is a controller, a table stand, a power lead and one wireless relay box: no radiator controllers, no OpenTherm and no hot water control. Judge it as the first component of a professionally installed whole-house system, not as a £215 thermostat.
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- Up to 12 heating zones plus a separate hot water zone, on Resideo's own figures
- Broadest system support here — most boiler types, heat pumps, district heating, S-plan and Y-plan
- The only product on this page designed from the outset to grow to whole-house zoning
- The pack includes no radiator controllers at all, so it does not deliver multi-zone heating as sold
- OpenTherm needs the separate R8810A1018 bridge, and hot water needs the ATF500DHW kit or a CS92A cylinder thermostat
- Realistically a qualified engineer's job — UK quotes for whole-system fitting run roughly £600 to £900 and up
Who shouldn't buy this
you want zoning on a budget — Drayton Wiser Kit 1 includes two radiator valves for £179.99.
Key specs
| Works with | Most boilers, heat pumps, district heating; S-plan and Y-plan |
| Control | Relay as sold; OpenTherm and hot water need extra hardware |
| Zoning | Up to 12 heating zones + 1 hot water; controllers extra |
| Fitting | Engineer's job; whole-system fitting quoted c.£600–£900+ |
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