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Smart heating creates comfort and saves energy. This reduces the running heating costs. In this buying guide, we show you what to look for when buying.

When the talk is of smart heating, in most cases you mean radiator thermostats with an app connection, which replace the old, manual ones . These sit directly on the radiator and regulate the temperature there. We have tested many of them in the past. Which is the best, we show in the top – 10: The best smart radiator thermostats. There is a large comparison in the comparison test 2020: The best smart radiator thermostats. We collect all guides and individual tests on our Smart Heating topic page.

In addition to the radiator thermostats on the radiator, smart solutions are also possible directly on the heating system or on the underfloor heating. What they all have in common is location-independent control via smartphone and voice control via Alexa and / or Google Assistant and / or Siri. They often need a bridge, get on with room thermostats and other smart home devices, and offer special functions such as geofencing. This purchase advice gives an overview.

Smart radiator thermostats Smart radiator thermostats can be used wherever there are classic radiators with rotary controls, the thermostat, in the room. This “stupid” thermostat can now be made “smart”. In the vast majority of cases, this works quite easily. All you have to do is loosen a screw ring with a pipe wrench or a French, remove the old thermostat and replace it with the new one. Great technical understanding is not necessary for this. Nobody has to fear water damage either, as the water cycle remains closed. Installers should not take too much time, as the radiators can be turned on fully without the thermostat screwed on and can get very hot.

Tado Thermostat V3 + (11 Pictures) It only becomes complicated when the radiator is hidden behind panels or a fitted kitchen, for example. Here you should make sure to buy a relatively small radiator thermostat. We recommend the thermostats Wiser Heat, Fritzdect 301 and Tado V3 + have an advantage because they are smaller than Innogy, Homematic IP, Comet DECT, Bosch and Eve Thermo.

The thermostats from Tado offer a bayonet lock to make them easier in hard-to-reach places to install. On the other hand, they can be detached from the radiator with a handle, for example to replace batteries.

Heating system If you have access to the heating system, it becomes confusing. This is simply because there are countless variants, including thermal baths, central heating or district heating. Tenants with central heating do not have the option of installing smart extension boxes there and have to limit themselves to local room control. If you have access, the expansion box switches directly in front of the boiler and connects wirelessly or wired to a wall thermostat.

The Homematic-IP control unit for underfloor heating. Before buying, you should be clear about whether the targeted solution supports your own heating system. If you don’t have an exotic in the basement, that shouldn’t be a problem. For example, Tado claims in its compatibility guide to support almost all heating systems. All providers of corresponding solutions provide such a list. The app usually guides you through the installation, which is no longer as simple as replacing a thermostat. If in doubt, we recommend consulting a specialist installer.

Once installed, they function similarly to a smart radiator thermostat. The extension boxes work best and most reliably with the room solutions in the form of a thermostat from the same manufacturer.

Bridge For central control, the thermostats usually communicate via a wireless connection standard with a bridge, which is either in the WLAN or directly on the router. But there are exceptions. Eve Thermo (test report) communicates directly with Apple devices via Bluetooth, Android is not supported. A Bluetooth bridge is also available on request, more details here. With it, the Eve solutions are permanently in the network, so location-independent control is also possible from the office, for example. AVM Fritzdect 301 (22 Pictures) Also AVM Fritzdect 301 (test report) and Comet DECT Thermostat (test report) come in a starter pack without a bridge, as they connect directly to a compatible Fritzbox via DECT (7490, 7580 and 7590 compared). A bridge is simply not necessary here, which saves money and an additional device that is permanently connected to the power – if you have a DECT-capable router.

Most other smart radiator thermostats use a proprietary radio protocol 868 MHz. Devolo (test report) relies on Z-Wave and Wiser Heat (test report) on Zigbee. Nevertheless, they absolutely need their own bridge. Because Wiser Heat does not connect to the Zigbee bridge from Philips Hue (test report starter kit) or a Zigbee-enabled Amazon Echo Plus 2 (test report).

The bridges are usually attached to the router via LAN cables. Some like the bridge from Tado use the router’s USB-A port for power supply, others like the bridge from Bosch (test report) require the supplied USB power supply unit. Bridges with WLAN, as offered by Wiser and Netatmo (test report), have the advantage that they can be placed regardless of location and do not block a LAN port on the router.

functions All smart thermostats come with an app. There the user can determine the current target temperature and set schedules. This usually also works from the cellular network, so it is location-independent. Some thermostats are based on the current outside temperature when setting the temperature. If you switch them off in summer, they turn the heating on and off again at regular intervals so that the valve, the pin on the radiator, remains movable.

Bosch smart radiator thermostat (8 images) All smart radiator thermostats have a temperature sensor, most of them log the actual temperature. Some also measure the humidity and include it in the statistics. On request, many detect a sudden drop in temperature, such as occurs when a window is opened for ventilation, and turn off the heating. Sounds good, but in practice it often works less well than hoped. In some cases we had to put an ice pack on the radiator thermostat to provoke it to turn off. In the case of underfloor heating, such an automatic system does not make sense anyway because of its inertia.

Some systems such as Tado support geofencing, i.e. include the location data of the residents. Tado turns off the radiators when all residents are out and back on when they approach. Others understand complex if-then routines or the IFTTT automation service, which is now chargeable.

If you attach particular importance to data security, you should look at the solution from AVM and Eve. There the data is not stored in the cloud, but on the router, or in the devices themselves or on the mobile device.

Netatmo smart radiator thermostat – screenshots (33 Pictures) Basically, all systems respond to calls after being appropriately integrated, making temperature control particularly convenient. Few of them, such as Tado Thermostat V3 + (test report) and Netatmo (test report), know the three big voice assistants from Google, Amazon and Apple. Almost everyone knows Alexa, but not Eve Thermo (test report), who only listens to Siri.

The systems differ significantly in terms of their range of functions and the usability of the app. For a better overview, we recommend our comparison test 2019: The best smart radiator thermostats and then reading the individual tests.

Smart Home The thermostats use an integrated sensor to determine the room temperature, which, due to the design, is always very close to the radiator. For many, the buyer can set an offset temperature via the app, i.e. always subtract a few degrees from the measured temperature in order to get closer to the actual temperature in the middle of the room. Using a room thermostat is more elegant and accurate. This then hangs, for example, near the couch, where the comfortable temperature should be achieved. Most systems have their own room thermostat for this, but not all.

Wiser Heat (6 images) In general, if you are interested in using it when deciding on a system, you should make sure that there are other compatible smart home components. For example, a window contact helps to reliably turn off the heating when the window is open.

Prices The prices of the individual thermostats vary from about 25 to 70 Euro. In larger households with many radiators, this can add up to considerable amounts. The thermostat from Comet is very cheap, followed by Innogy. Buyers have to buy a little more for the temperature controllers Homematic IP, Bosch, Fritzdect 301 and Wiser put …. on the table. The most expensive system comes from Tado. It should be noted here that with Innogy after twelve months and with Tado V3 + from the start, follow-up costs are incurred for some functions in the form of a subscription model.

An AVM Fritzdect 301 Thermostat (test report) costs about 45 Euro, the Compatible Comet DECT thermostat (test report) currently only good 30 Euro. You connect directly to a Fritzbox, there is no additional bridge. This means that entry into the smart heating world with the AVM / Comet solution is relatively cheap, provided you already have a compatible Fritzbox. Bosch smart radiator thermostat (test report) wants for its starter set consisting of two thermostats, a window contact and the bridge 175 Euro.

In the Homematic IP starter set (test report), buyers will find a thermostat and the access point as well as an optical window contact. If you want to integrate the Homematic IP thermostats into your existing Homematic system, you can do without the access point and use the individual thermostats, which are for example 50 Euro.

Eve Thermo (test report) costs well 60 Euro. An iPhone, iPad or Macbook is required for setup and operation. The Innogy starter set comes with 135 Euro for three thermostats and the bridge almost a bargain compared to the others. Each Innogy thermostat (test report) costs about 50 Euro. Innogy sells many other compatible smart home components. Attention: After twelve months, subscription fees apply.

The Tado Thermostat V3 + (test report) costs about with a thermostat and bridge Euro. With Wiser Heat Thermostat (test report) the entry is because of the cost-intensive WLAN-B