Eve Thermo Control

Buy it for the cold sofa, not the product family

A radiator valve measures temperature in an awkward place: close to the radiator itself. Thermo Control lets compatible Eve Thermo valves use a reading from elsewhere in the room. That is its best reason to exist. Place it where comfort matters, and the heating can respond to that location rather than relying on a fixed correction to the valve's own reading.

The €79.95 price is harder to like. It costs as much as a new Eve Thermo valve, taking a single-valve room to about €160 before any home hub. We would first decide whether the existing valve's temperature offset is sufficient. If the room is already comfortable, this accessory mostly buys a display and more convenient buttons.

Its value improves in a larger room with several radiators. One Thermo Control can work with a group of up to five compatible Eve valves. They should be in the same room; one sensor by the living-room sofa cannot meaningfully represent several bedrooms as well.

A useful little object to keep within reach

The 54 mm square body is only 19 mm deep. Its E-Ink screen shows temperature, humidity and heating information, with a choice of whether current or target temperature takes the main position. Touch controls adjust the setpoint in half-degree steps, saving a trip to the radiator or a search for the phone.

The built-in battery charges through USB-C, and a cable is included. That keeps daily use free of a power lead, although the unit will eventually need to visit a charger. The battery is integrated, unlike the replaceable AA cells in the radiator valve.

Manual adjustments also coexist with the valve's schedule. The next scheduled change can replace a setting entered at the controller. Treat it as a convenient room control, not a permanent override of every heating routine.

The narrow ecosystem is the real drawback

The main control function requires Apple Home, a Thread-capable Apple home hub and the Eve app. It works with fifth-generation Eve Thermo or a compatible fourth-generation valve upgraded to Matter. Other connected Matter platforms can see temperature and humidity, but that does not give them the same valve-control arrangement.

It also cannot command another manufacturer's thermostat or Eve's own underfloor-heating thermostat. Those restrictions make it a poor general-purpose purchase. If all you need is a temperature readout, an ordinary room thermometer avoids paying for a heating feature you cannot use.

For an Apple/Eve room with an unrepresentative radiator reading, however, the combination of better sensor placement and reachable controls has a clear purpose. That is the room in which we would spend the money.