Honeywell Evohome

What is the Honeywell Evohome?

When Honeywell Evohome launched a few years back, the system was the most powerful multiroom heating system available. Fast-forward a few years, and it remains in the same position.

While most heating systems start with a single-zone thermostat and let you build out multiroom control, Evohome is designed with multiroom in mind. As such, the system is more expensive than much of the competition, but the trade-off is well worth it if you’re after fine control.

With a dedicated heating control panel and support for everything from single radiator valves to underfloor heating systems, Evohome is one of the most flexible smart heating systems around. It lacks some features I’d expect – including geolocation – and the hardware is a little clunky-looking, but much of this can be forgiven.

Related: Best smart thermostats

Honeywell Evohome – Design and installation

At its most basic, Honeywell Evohome requires the Wi-Fi controller and the boiler relay. Depending on your boiler, you’ll either need the kit with the standard on/off relay, or the OpenTherm Bridge, which provides modulating heating control. The latter is the best option if your boiler supports it, since you’ll increase your energy savings as a result (see, What is OpenTherm?).

An additional relay will be necessary if you want Evohome to control your hot water system as well. At this point, the heating system can operate as any old smart thermostat would, controlling your heating using the temperature sensor in the controller.

For multiroom control, you need to start adding other components to the fold. For radiators, you’ll need the HR92UK radiator valve (£59.99 each, although you can get a discount if you buy in bulk). These valves replace your existing radiator TRVs, providing individual control over a radiator’s temperature. These screw into place and are easy to fit. Adapter rings are available for different-sized screw threads.

You can add multiple HR92UK devices into an Evohome room, which is handy for areas with more than one radiator. The HR92UK isn’t the prettiest of devices and looks a little plasticky. However, the neat LCD screen and twist dial at the top provide a lot more control than rival devices.

Although each HR92UK can measure the temperature in any particular room, you can in fact use compatible wireless room thermostats to take the temperature instead. This may be required if your radiator sits behind furniture, since this can throw off the HR92UK’s temperature sensor.

If you have underfloor heating, there are a couple of options. For a single manifold, one BDR91 relay and wireless thermostat will do the job (you can see the relay tucked away in the picture below, controlling my underfloor heating manifold). For multiple zones, there are dedicated underfloor controls.

Overall, there’s little that Evohome can’t control, but speccing up your system requires some thought and time. It’s worth paying for installation, too, just to make sure that everything is fitted correctly

Honeywell Evohome – Features

Control of the system is primarily through the capacitive touchscreen controller. From here you can configure rooms, adding in the sensors and valves that each one contains.

Once your rooms are configured, you have to set up schedules. Each room can have a different schedule: you can have your bedroom, bathroom and kitchen warm up first thing in the morning, for example, with the living room coming on later in the day.

There’s a wizard on hand that asks you simple questions to build a schedule for you, but I found it easier to set the schedule manually. Once one room is configured, you can copy its schedule for different days and other rooms. There’s no learning option available.

There are a couple of extra heating modes that you can use, too. Optimum Start learns how your home heats up, so the boiler can be turned on early, ensuring your rooms are warm when you need them to be. Optimum Stop will shut your heating down early, letting the temperature fall by 0.5ºC before turning it back on to save more money.

Each radiator valve is also capable of Window Detection (configurable through the clunky on-device menu that you’ll want to use the manual to decipher), turning heating off to a radiator when you open a window or door. The option – called Win Type in the menus – is turned on by default, but you can configure how long it takes to trigger, and even the temperature fall rate to turn it on. To be honest, you’re better off leaving the defaults alone.

Quick Actions are configurable options to set how your heating works. Heating Off sets every room to 5ºC and is useful if you’re going on holiday or want to turn the heating off when winter is over.

Economy mode drops the room temperature by 3ºC. Day Off mode will follow the Saturday schedule – it’s handy if you’re working from home and want the house warm while you’re in.

Custom mode lets you control what happens. For example, I had it as a Guest mode, which turned the heating on in the spare bedroom and bathroom for when guests came round.

Away mode sets the temperature to the level you set, so you can save money when you go out. However, without Geolocation built in, there’s no option to set this automatically. There are two other options, though.

If you have Evohome Security, you can set Away mode to be turned on when you arm the alarm. However, this is practically useless, as you can’t turn off the Quick Action when you unlock the alarm. Alternatively, you can use IFTTT to fire the rule automatically. All Quick Actions can be set permanently or on a timer.

App control is provided by the Honeywell Total Connect Comfort app. From the homepage you can view each room, and both its current set temperature and existing temperature. Tap a room to quickly adjust the temperature, setting it permanently or on a timer.

Schedules can be edited per room, but you can’t copy them between rooms (only between days for that room), making initial configuration easier through the controller.

Quick Actions line the top of the page, although they only have icons, so you have to remember what they mean – or tap them to find out. There’s little else to do from the app, and it’s all about simple heating controls.

Honeywell Evohome – Amazon Alexa, Google Assistant and IFTTT

IFTTT support lets you set or disable a Quick Action, which means you can build your own geolocation rules using a service such as Life360. Alternatively, you could use a Flic button or Logitech Pop! with IFTTT to have a physical button to turn your heating off when you go out, and back on when you return home.

Amazon Alexa support is built in, and the reliability has improved since launch. With the skill, you can find out the temperature of a room or change the room temperature. Changes are made until the next scheduled change. Amazon Alexa supports Quick Actions, too, so you use an Alexa Routine to change your heating mode, for example.

Google Assistant support is available, too. Quick Actions aren’t detected by the system, so you can’t use them in the same way in Google Home routines. Otherwise, the controls are the same as for Alexa: you can get a room’s temperature or set it to the temperature that you want.

Honeywell Evohome – Performance

The beauty of Evohome is how easy it is to use. Walk into a room and find it a bit chilly, for example, and you can just use the dial on the thermostat to get a heating boost. If you’re heating only one room, the radiator warms up super-quickly, as the boiler isn’t heating the entire system. Changes made from the TRV are instant, and the new temperature is set until the next scheduled change.

Changes made from the app, a voice assistant or the controller take a few minutes, since the battery-saving low power signal is sent less frequently to the smart radiator valves. This kind of delay isn’t really an issue in everyday use.

I’ve had Evohome since launch and have found it extremely reliable. Batteries in the TRVs (2 x AA) tend to last around 18 months or so. The battery meter on the display indicates when it’s time to switch them out, although it isn’t always that accurate. On some occasions, I’ve found that a TRV has enough power for the LCD, but not enough to change the valve; a cold radiator is a good indicator that something needs to be changed.

Why buy the Honeywell Evohome?

My list of the best smart thermostats shows how many products there are to choose from, but Honeywell Evohome manages to distinguish itself. Yes, it’s expensive, but the range of control options and touchscreen controller offer up a flexibility that isn’t seen elsewhere.

An app update adding geolocation, or better integration with the security system, would be appreciated; but these are minor complaints that are easy to live with or workaround.

If you don’t want to splash out on such an expensive system, the Nest Learning Thermostat 3rd Gen is the best single-zone-only model. If you want something that you can expand in the future, the Tado Smart Thermostat is a great choice with its optional smart radiator valves.

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