The short version: The Honeywell evohome Round Radiator Controller (sold internationally as the HR92) is a battery-powered smart radiator valve built as part of Honeywell/Resideo’s evohome zoning system, which can manage up to 12 individually scheduled radiator zones from a central evohome controller. It’s a well-regarded, mature product in the UK and Europe, where it’s the primary market. In Canada, it’s a niche, hard-to-find item — sold through specialty HVAC suppliers rather than mainstream retail, and buyers should expect to hunt for stock and possibly import before assuming it’s a straightforward purchase.

This is a per-radiator device for hydronic heat, part of a broader zoned-heating system, not a standalone whole-home thermostat.

A Note on Availability Before You Read Further

Unlike every other product in this radiator-valve roundup, the evohome Round Radiator Controller is not readily stocked by Amazon.ca, Home Depot, or other mainstream Canadian retailers. It’s fundamentally a UK/Europe product, tied to Honeywell’s evohome ecosystem, which has its deepest install base and support network overseas. In Canada, you’re generally looking at specialty HVAC suppliers with limited, inconsistent stock. If you want a smart radiator valve you can buy today with a couple of clicks, look at Aqara E1, Sonoff TRVZB, or SwitchBot instead — all of which are readily available on Amazon.ca. This review is for readers specifically researching evohome, often because they already have (or are considering) the broader evohome zoning system.

Who It’s For

The evohome Round controller is for homes with hydronic (hot water) radiator heat, the kind found in older housing stock in parts of Ontario and Quebec with European-influenced building history, and for anyone already running (or seriously considering) a full evohome zoning setup, where a central evohome controller manages multiple rooms, each with its own HR92 radiator valve. It is not a fit for forced-air or electric baseboard homes — see our baseboard thermostat coverage for that instead.

Because of the availability situation, it’s most realistic for buyers who are comfortable sourcing from specialty suppliers or importing, rather than someone who wants a same-week Amazon purchase.

Design & Build

The HR92 has a slim, ergonomically shaped body designed to fit onto standard TRV valve bodies, with a backlit, flip-up LCD screen that folds flat when not in use or angles up for easy reading. It uses two-way communication with the evohome controller, confirming that commands to open or close the valve were actually received — a detail independent UK reviews (Pocket-lint, RiDC) call out as more robust than simpler one-way radiator valves.

Setup & Compatibility

Valve fit: Designed for standard TRV valve bodies common in European-style hydronic heating; as with any TRV, confirm your specific radiator’s valve thread before ordering, since sourcing replacement adapters in Canada may be its own challenge given limited local stock.

System requirement: The Round Radiator Controller is designed to work as part of the evohome zoning system, controlled from a central evohome wall controller, which manages up to 12 individually scheduled heating zones. It’s not really meant to be bought as a single standalone valve the way Aqara or Sonoff TRVs are; it’s an ecosystem play.

Power: Battery-powered, with Honeywell citing roughly two years of battery life per HR92 unit under normal use.

App & Ecosystem

Evohome zones can be scheduled up to six times a day per zone, controlled through the evohome app or at the central wall controller. UK reviews (Pocket-lint calls it “the Sonos of heating”) consistently praise the depth of per-zone scheduling once set up, though the app and setup process is generally described as more involved than simpler single-valve TRVs like Aqara or SwitchBot — appropriate for a system managing many zones, overkill if you just want to smarten up two radiators.

Price & Value

Honeywell evohome Round Radiator Controller
Price per valve (CAD) ~$80–110
Central evohome controller required Yes, for full zoning functionality
Power Battery (~2-year life per unit)
Subscription required No

Per-valve pricing is comparable to Danfoss Ally and below Tado or Eve, but the real cost of an evohome setup is the central controller plus multiple HR92 units for a full zoned system — closer to a whole-home zoning investment than a single cheap valve purchase. Factor in the added friction and potential shipping cost of sourcing through specialty suppliers rather than mainstream Canadian retail.

Pros & Cons

Pros:
– Two-way communication confirms commands were actually received by the valve
– Part of a mature, well-reviewed zoning system (evohome) with a long track record in Europe
– Backlit, flip-up display is easy to read
– Roughly two years of battery life per unit

Cons:
– Limited, inconsistent Canadian availability — mostly specialty HVAC suppliers, not mainstream retail
– Designed around the broader evohome ecosystem, not ideal as a single standalone valve purchase
– Setup and app complexity is higher than simpler single-valve competitors
– Primarily a UK/Europe product, so Canadian-specific support and documentation are thinner

Smart radiator valves compared: Honeywell evohome, Danfoss Ally, Tado X, Aqara E1, Eve Thermo, Sonoff TRVZB, SwitchBot, with valve compatibility, hub/system requirements, and price per unit

The Recommendation

Consider the Honeywell evohome Round Radiator Controller if you’re already committed to (or seriously evaluating) a full evohome zoning system, and you’re willing to source it through a specialty HVAC supplier rather than expecting mainstream Canadian retail availability.

Skip it if you just want to smarten up one or two radiators with minimal fuss — Aqara E1, Sonoff TRVZB, or SwitchBot are all far easier to buy in Canada and don’t require buying into a full zoning ecosystem.

Frequently Asked Questions

Is the Honeywell evohome Round Radiator Controller easy to buy in Canada?
No. It’s primarily a UK/Europe product with limited availability here, generally through specialty HVAC suppliers rather than Amazon.ca or big-box retailers. Confirm current stock and pricing with a supplier before planning a purchase around it.

Do I need the full evohome system to use this valve?
Effectively yes. It’s designed to work as part of evohome’s zoned heating system controlled from a central wall unit, not as a fully standalone smart valve the way Aqara or SwitchBot are.

How many radiators can evohome manage?
Up to 12 individually scheduled zones from one central evohome controller, each zone typically corresponding to one HR92 radiator valve.

What’s the battery life on the HR92?
Honeywell cites roughly two years per unit under normal use.

Is there an easier alternative if I just want one or two smart radiator valves?
Yes — Aqara E1, Sonoff TRVZB, and SwitchBot’s Smart Radiator Thermostat are all readily available in Canada and don’t require adopting a full zoning system.