Best Test Fritz 301 2026

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Last Updated - 03.02.2026

Best Choice

01

ET - EUROTRONIC Technology GmbH

Eurotronic Comet Plus Radiator Thermostat

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37% Off
9.7

Exceptional

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Optimal adaptation to weather conditions: The Comet Plus has a holiday function, frost and limescale protection function and an automatic summer and winter time adjustment, which can save you on heating costs.
Note: heating valves with which the regulators are compatible without adapters, and that the included black plastic adapters are only suitable for Danfoss valves
Individually programmable: The settings can be made directly on the Comet Plus or even more comfortably using the PROGmatic programming stick (not included) on the PC.
Easy to use: The Comet Plus energy saving controller is easy to install and operate. It is valve-friendly thanks to the Eurotronic valve protection and also fits many other well-known radiator valves.
Box contents: Comet Plus energy-saving controller, instruction manual DE (other languages on request), 3 adapters (Danfoss RA, RAV, RAVL), 2 x AA Mignon batteries, dimensions: 65 x 54 x 85 mm, set of 4, colour: white
AUTOMATIC ROOM VENTILATION Thanks to the window open detection, the radiator thermostat detects directly when a room is being ventilated and closes the valve immediately to save energy.

76,07 € 119,95 €(37% Off off)
02

Tado

tado ° Smart Radiator Thermostat X, Heating Control via App and Smart Speaker (Alexa, Siri, Google Assistant), Saves Energy & Costs, DIY Installation

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9.6

Exceptional

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Saves energy and costs: with the intelligent heating thermostat X from tado°, the expert in smart heating, users save an average of 22 percent energy – the more rooms you control, the more you save
SAVE MAXIMUM WITH AI: With "AI-Assist" you save up to 55 percent more energy thanks to automations such as geofencing, window open detection, urban mode, insights into energy costs, solutions to heating problems and much more. (only € 3.99/month, € 29.99/year)
Intuitive operation: via touch display, the thermostat can be installed and operated smoothly - the removable battery is charged in about 2 hours with any standard USB-C cable (only 1 x per season required)
Important to know: tado° X products are not compatible with tado° V3+ or older
Future-proof technologies: Thanks to Matter, different smart home devices can communicate with each other, at the same time Thread ensures a stable network – this requires the Bridge X (not included) or another Thread Border Router
For your smart home: In addition to the direct setting on the thermostat, you can also easily control the individual temperature per room via app or via smart speaker with Amazon Alexa, Google Assistant or Apple Siri
Easy DIY installation, also offline: thanks to the included adapters, the thermostat fits almost all radiator valves, whereby the robust metal nut ensures a stable hold on the radiator without risk of leakage (exclusive with extra template)
Control via app: the thermostat offers numerous features for your heating such as temperature control via app, intelligent schedules and much more

54,99 €
03

ET - EUROTRONIC Technology GmbH

Eurotronic Comet Plus Radiator Thermostat

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9.3

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Optimal adaptation to weather conditions: The Comet Plus has a holiday function, frost and limescale protection function and an automatic summer and winter time adjustment, which can save you on heating costs.
Individually programmable: The settings can be made directly on the Comet Plus or even more comfortably using the PROGmatic programming stick (not included) on the PC.
Easy to use: The Comet Plus energy saving controller is easy to install and operate. It is valve-friendly thanks to the Eurotronic valve protection and also fits many other well-known radiator valves.
Box contents: Comet Plus energy-saving controller, instruction manual DE (other languages on request), 3 adapters (Danfoss RA, RAV, RAVL), 2 x AA Mignon batteries, dimensions: 65 x 54 x 85 mm, colour: white
AUTOMATIC ROOM VENTILATION Thanks to the window open detection, the radiator thermostat detects directly when a room is being ventilated and closes the valve immediately to save energy.

15,12 €
Value for Money

04

Homematic IP

Homematic IP Smart Home Radiator Thermostat – Basic, Digital, for Heater, Control via App, Alexa, Google Assistant, Easy Installation, Energy Savings, 153412A3

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15% Off
9.1

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

With the basic radiator thermostat, you can save up to 33% on heating costs– thanks to individual temperature schedules with up to 13 changes per day across three adjustable heating profiles and in combination with open-window detection using a window and door contact.
The setup and control of the thermostat via the free smartphone app and the free cloud service requires connection to the Homematic IP Access Point. This product is no longer compatible with the CCU2 central unit.
Stand-alone operation (push-to-pair) allows direct pairing of up to eight Homematic IP window and door contacts (HmIP-SWDM) and direct control on the device.
Replaces conventional radiator thermostats in just a few simple steps– no intervention in the heating system or draining of water is required.
Ready for immediate use thanks to preset heating profile, which can be manually adjusted if required (individual temperature gradients with up to 13 changes per day).

25,45 € 29,95 €(15% Off off)
05

TP-Link

TP-Link Kasa KE100 Smart Radiator Thermostat, Accessory Product, Energy Saving, Schedule, Control on the Go via App, Alexa and Google Assistant, Hub Required, White, 56.6 x 56.5 x 83.93 mm

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15% Off
9.0

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Versatile compatibility – Fits most radiator valve threads (M30x1.5) and the six included adapters (RA, RAV, RAVL, CAL, M28 and GIA) ensure more compatibility. -
Ultra-long standby time – Using the energy-saving wireless technologies that promise a longer battery life.
Smart anywhere and any time – Control the temperature of your home with the Kasa Smart App from anywhere and any time. Set schedules to automate your heating that matches your daily routines. Open window detection – KE100 can now work with Tapo T110. Please add Tapo T110 via the KH100 hub in the Kasa app.
Room-by-room comfort – Set the perfect temperature in each room individually. Save your preferred scenario for further use.
Please note that the Kasa KE100 can only be controlled via the Kasa app and not via the Tapo app. Tapo sensors (Tapo T110, Tapo T310, Tapo T315) can be set up in the Kasa app. Please add the Tapo sensors via the KH100 hub in the Kasa app. The Kasa KE100 kit only supports 2.4GHz WiFi, not 5GHz.
One for all – Each hub can connect and control up to 32 radiators, with the Kasa app you can combine and control all radiators. All rooms under control.
Matter certified – Users can connect the KE100 locally to Apple Home, Amazon Alexa, Google Home, Samsung SmartThings or other Matter-enabled smart home platforms. *Kasa Hub required. *Please update the Kasa app and KH100 firmware to the latest version. 1. Go to the KH100 Hub page in the app, then go to Device Settings > Mount to Matter to find Matter code. 2. Follow the Matter setup process to configure KH100. 3. All other Kasa Hub products, such as TRVs and sensors, are synchronised with third-party platforms.
Easy installation – Simply replace your old radiator valve with Kasa and follow the step-by-step instructions (English language not guaranteed) in the app for installation. You can do all this yourself without difficulty.
Child lock – Prevent children from accidentally operating your radiator.
Caution. Please note that this thermostat must work together with a hub, you must have KE100 KIT in advance. KE100 cannot work with the Tapo H100 and Tapo H200 hub, but only with the hub in the KE100 kit.

24,65 € 29,00 €(15% Off off)
06

mein haus shop

Radiator Thermostat Adapter for RA Valves Stainless Steel (1)

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8.9

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Material: 1.4301 rustproof
For applications where look and design are in the foreground
Connection: thread M30 x 1.5
Compatibility: Danfoss RA, RA-N - Valves
2023 version made of stainless steel

7,35 €
07

shuokang

Radiator Thermostat Protective Cover with Lock Upgrade, Thermostat Sensors, Universal Intelligent Radiator Controller Protection Box, More Space, Additional Clips, for AVM FRITZ, Honeywell Home

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8.6

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Widely used: the double-opening hexagonal locking mechanism securely locks a variety of heating thermostats. The thermostat lock cover with key provides protection for radiator valves, smart radiator regulators installed in dining rooms, offices, living rooms and bedrooms, classrooms and industrial environments!
Universal thermostat protection box: this radiator thermostat protection box is suitable for most cylindrically shaped thermostats, fits heating thermostats with a diameter of 2.3 inches, length 4.5 inches or smaller, and the water valve below 1.18 inches is also suitable, we recommend you measure the size before purchasing.
Thermostat protection box with key: the thermostat protective cover with key prevents children and guests from tampering, damaging and unauthorised changing the thermostat settings, and also prevents pets such as dogs and cats from touching the thermostat. The outer corners of the protective box are polished and designed so that children and pets cannot be accidentally injured.
Friendly design: the waterproof, dustproof and heat-dissipating protective box of the heater controller has a hexagonal design that is robust and durable. It is not only UV-resistant, but also has anti-yellowing properties. And it comes with a protective plug that can be removed when you need to dissipate heat from the thermostat, and can be installed when you need to protect children and pets.
Easy installation: it can be installed without tools, which makes it easier to use. Just open the thermostat sealing box, put the sealing box over the thermostat, then install the dust plug in the small opening, padlock it and you're done.

17,99 €
08

Fritz

AVM FRITZ! DECT 200 - Intelligent socket for the home network, German-language version

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8.5

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Switch individually: once, daily, weekly, rhythmically, randomly, depending on the time of sunrise and sunset or via Google Calendar
Measures energy consumption and shows details on performance, consumption, electricity costs and the carbon footprint and sends them on request by Push-Mail, scope of delivery: FRITZ! DECT 200, German installation instructions
Intelligent socket for Smart Home, switches the power supply of connected devices automatically or manually (up to 2,300 watts)
Controllable via FRITZ! Fon via DECT, via PC, smartphone or tablet via the user interface of the FRITZ! Box or MyFRITZ! App
Compatible with the following FRITZ! Boxes: FRITZ! Box 7490, FRITZ! Box 7390, FRITZ! Box 7360, FRITZ! Box 7320 (1 & 1), FRITZ! Box 7270 ( From version v2), FRITZ! Box 7272, FRITZ! Box 7240 (1 & 1), FRITZ! Box 6842 LTE, FRITZ! Box 6840 LTE, FRITZ! Box 6810 LTE, FRITZ! Box 6360 Cable, FRITZ! Box 6490 Cable

43,99 €
09

KETOTEK

KETOTEK WiFi Thermostat - Works with Alexa Echo / Google Home - IFTTT Tuya Compatible - Programmable Room Thermostat with Smart Voice and App Control

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8.4

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

WiFi thermostat for electric underfloor heating: flush-mounted installation, easy to install. The KTF0155A is a Wi-Fi enabled thermostat for electric underfloor heating. It works fully with or without Wi-Fi. The WiFi connection allows quick and easy access to the KETOTEK thermostat via your smartphone as well as compatibility with Alexa or Google Assistant for voice control. Power supply: AC 90-240V 50/60Hz, output: max. 16A.
Voice control: This thermostat electric underfloor heating WiFi is compatible with Alexa and Google Assistant. Connecting to Alexa is as easy as setting up another Alexa skill. Once connected to Alexa, you can control your room temperature by voice - you can instruct Alexa to change the temperature without getting out of bed, especially in winter.
Other functions: This WiFi thermostat can be set to detect a rapid temperature drop in the room (e.g. when a window is opened) and automatically pauses the heating to avoid energy waste. You can lock the thermostat to prevent others from changing the temperatures or settings via the wall display. Other functions: temperature calibration, reset, memory function, anti-freeze function, high temperature protection, etc.
Create schedules: Choose between program mode, manual mode or holiday mode to optimally adapt your heater to your lifestyle. The program mode offers different schedule settings, including 5-2 days, 6-1 days and 7-0 days planning with 6 time periods and temperature settings per day. Heat your home to the right temperature only with the heating plan to save energy and costs on your electricity bill.
App control: Simply connect the thermostat to the WiFi to control the temperature and settings via your smartphone via Smart Life/Tuya app. You can monitor your thermostats, adjust temperatures, create schedules and use different options in the app from anywhere and anytime. Do you want to control and program multiple thermostats at the same time? Simply create a group directly in the app. 2.4GHz Wi-Fi required (no 5GHz).

47,99 €
10

Homematic IP

Homematic IP Smart Home Radiator Thermostat - Standard - Intelligent heating control via app and voice control with Amazon Alexa, 140280A0

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8.3

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Thanks to the optimum start / stop function, the desired room temperature is calculated in advance and thus achieved in the heating profile at the set point in time.
Replaces conventional thermostats (M30x1.5, Oventrop, Danfoss) and controls the radiator according to individual needs.
Note: You can get products with different model numbers, but the functionality of all products is identical
Individual temperature profiles with up to 13 changes per day in 3 adjustable heating profiles.
For operation, the Homematic IP Access Point in connection with the free app (free cloud service), the central CCU2 / CCU3 or a suitable partner solution is necessary.
Energy savings of up to 30% through automatic temperature reduction when ventilating and heating as required
Convenient voice control with Google Assistant and Alexa, e.g. B. via Echo in connection with the Homematic IP Access Point.
Automatic lowering of the temperature during ventilation via the window open detection or in connection with the Homematic IP window and door contact - optical

49,10 €