Waste of money, if the power goes out it does not connect to the router (automatically, at least mine) you have to connect it manually. After many attempts by the official representative, unfortunately the problem remains. I will proceed to order another thermostat from a different company of course.

Going from a thermostat like Nest or Ecobee in the USA to this thing is like going back in time... Total piece of crap. Extremely limited functionality, horrible UI and remote experience... Super expensive for what it is. Strongly regret my purchase.

If you don't bring a serious electrician to install it for you and not some clowns pretending to be professionals, don't buy it. As a product, it's super. I reduced the consumption to one third from before when I had an analog thermostat. It's worth the money!!

Two thermostats were installed in the summer. With minimal use, one has already broken in 3 months. I have made a thousand calls to the dealership, but I still don't have a solution. I'm waiting for the second one to break before the end of the first winter. Wasted money and a lot of it. Update... At the beginning of the second winter, that is, early December. The second thermostat has broken as well. Junk.

Replaced the old (digital) thermostat for radiators and boiler. In a few words: More accurate in its measurements, with humidity and air quality measurement resulting in fewer boiler starts. Also, yes, after a month of use, its algorithm adjusts it to heating needs with economy in mind. Quite a smart and advanced product.

It does not read the temperature correctly, despite calibration. It shows random values. Thankfully, the wifi works flawlessly. Unacceptable for a product with the Siemens brand. The app is good and convenient.

I have three RDS110. Nothing special for their price. Bad and slow application that forces you to enter each thermostat separately to see temperatures. They do not provide the API for integration into automation programs like home assistant.

Excellent thermostat. I have seen real savings since I installed it compared to the old analog thermostat and manual temperature changes.

It has excellent accuracy in measuring the room temperature, even though it is installed in the warmest room of the house, it performs very well in the times it activates the boiler. I wish I had installed the RDS-110R though, which is identical but adds an additional wireless thermostat in any room you want, which serves better.

It was chosen because it has independent boiler operation. I travel frequently and this is the #1 function I needed, hot water on demand (house without solar).

I have identified two negatives related to the app, and for this reason I am deducting a star.
First, for manual boiler activation, there is no timer function. Either you remember to turn it off, or it will operate indefinitely. This MUST be fixed. It is a safety issue.
And secondly, it does not support Google Assistant/Alexa.

After 4 months of use, the air quality signal was lost and the mobile displays it as an undefined air quality, which means that the sensor burned out. It's definitely not worth 200€, Siemens has taken many steps back with this thermostat. It was fine with the analog, why did it need the evolution? Thankfully, the wifi doesn't disconnect, if it did, it would be useless

All good, it works as it should.
Positives
- Doesn't require batteries, connects to power
- Easy management through the app

Negatives
- Frequent disconnections from wifi (maybe it's my router's fault?)
- Doesn't display the time (like the Siemens RDE100.1)
- You can program up to 4 periods per day

The application has not been connecting to the thermostat for 20 days, resulting in not being able to take advantage of many of its features. If you forget the code for the advance settings, you have to send it to Athens for a reset! Unacceptable for such an expensive thermostat.

At first, there was a problem with the temperature and humidity measurements. I contacted Siemens and they provided me with a solution. In the advanced settings, there is a possibility of calibration, so the problem was corrected. The strange thing is that although the temperature and humidity sensors are supposed to be separate, by calibrating the temperature, the humidity measurement was also corrected. The relay can be heard when the boiler opens and closes, but not in an annoying location. Also, I do not have the ability to adjust the hot water usage from the thermostat, maybe I did not set it up correctly initially, but it is not something that bothers me constantly, so I did not investigate further. Finally, I really appreciate the ability of remote management of the boiler.

Good screen response, excellent mobile application.
Difficulty in installation if you want hot water - lacking instructions even for an electrician! If you want to remove it to see something with the cables in the relays, you will have to say a prayer! Fake construction! Expensive and definitely wouldn't buy it again! If this one breaks now, I wouldn't spend a euro on it again.. Just a simple and final thought...

Poor quality sticker on the photocell, it came off in the first week. In a communication I had with Siemens, they informed me that they are aware of the problem and will send me a new one. I think it is unacceptable for a thermostat worth 200€!

Apart from the mobile application, you can also manage and view the performance charts on the following page. Login with the username you created in the application.

https://www.climatixic.com/

After 2 months, I am still trying to learn it. There is a great lack of manuals with detailed instructions, as well as a lack of technical knowledge in the market. In theory, it is very good but difficult to understand. The application works very well, as well as the programming through it. The motion sensor easily detects and immediately changes the program, resulting in it starting to work without needing or understanding it. Finally, I still haven't managed to properly operate the hot water usage. Possibly, the next one will be something else that is much cheaper since I don't consider it worth the cost.

I enter the process to evaluate only because if someone asks for a simple gadget to remotely control the boiler, they definitely pay a high price for it. But if we ask for a truly smart thermostat, then this Siemens one is the one.
A top-notch professional thermostat with PID self-adaptive algorithm function that learns how quickly the space heats up after a command is given and how quickly it cools down by automatically flashing its operation earlier than the selected temperature, making serious savings. With a presence sensor that detects our presence in the space, automatically raising and lowering the temperature according to the situation. With a fine particle sensor that informs us when the space needs to be ventilated or ionized due to a high percentage of dust.
For simple on-off commands, get a Chinese one because this one is several levels above!
I describe it as a top-notch technician!

It connects easily and after 2 months it hasn't crashed once. The mobile application is quite good.
2 negatives:
- It doesn't connect with other systems (Alexa, Google Assistant).
- It doesn't have a log file for statistics

Kids everything is fine but it has one disadvantage....the thermostat does not have a battery so in the summer if the power goes out from the boiler (e.g. if you live in an apartment building) you don't have a screen because it doesn't have power....so the temperature and humidity indication does not work. Unacceptable for such an expensive thermostat.