I have installed two thermostats. Flawless operation through the program fully meets my needs

I could give it 5 stars only because it is a Greek product and we support Greek products, but guys, the menu in the app doesn't have any Greek. Such a shame!!!!!!!!!
We buy Chinese products like surveillance cameras and their menu has Greek

A few months in use and it works perfectly (compared to another brand that used to forget to turn off). Used in an apartment, the ability to adjust the temperature and activate or deactivate it with the mobile phone is very useful, as well as being able to accept low differential settings.

Easy installation, wide range of customization options, but a bit of a headache to press the right button during programming.
Diligent and efficient helpdesk.
The downsides are that:
- there is no possibility for daily or weekly scheduling of the boiler. Only manual opening from the application or the built-in button and automatic closing after a predetermined time.
- it is not integrated into smart home applications and
- disconnection of the Android application from the server, despite being authorized for automatic startup and unrestricted by mobile battery protection algorithm.

Excellent thermostat and Greek!! It never loses its connection. The new update was recently released on Google Play for Android because it had an issue with version 11.
You can find it here: https://play.google.com/store/apps/details?id=gr.olympia_electronics.thermostat&hl=en

2 years in my possession. The thermostat is easy to install and connect to Wi-Fi. Its menu takes a few hours to get used to and work with correctly, and the accompanying application is simple and understandable. The positives are the connection to the boiler and the low differential (+-2), as well as when there is a power outage, it automatically reconnects to Wi-Fi (without manual actions) when the power is restored. The only drawback I have found so far is the programming on a daily basis (e.g. thermostat operating hours at predetermined times during the day), as after about 48 hours it does not follow the program you have set for it (it somehow loses it). If you are not interested in this function so much, then buy it without fear!

It does what it says. It never disconnects and the temperature measurement is accurate. The app only has the basics (on/off and temperature adjustment). The settings menu is difficult, but you can adjust everything. The lights are very bright, and it also has a green standby light that turns on when it is powered, which can be a bit annoying. Personally, I covered the green light internally with tape. There aren't many options for wireless with a boiler.

Nice construction! Accurate measurement. And programming capabilities. The application needs work.
If I find out why it reboots and shuts down after an indefinite period (we froze at night)... it would be good....

Update 27/2/2021: It disconnects from the application and reconnects whenever it wants. It doesn't even catch the delete and reconnect.

So far very satisfied. I put two at home.
+ Accurate measurement
+ Much more impressive up close
+ The power LED is so strong that it also works as a night light in the dark ;)
+ Easy management of both from the application
+ Illuminated screen

- I would like it to have a Proximity Sensor to turn on the screen when you approach.
- The quality of the plastics may seem low to you.
EDIT 2/1/2024: Successfully 3 years with these, something else negative that I noticed is that after a few days their clock starts and stays a few minutes behind. That is, when I have, for example, 12:00 on other clocks, on the thermostat I will have 11:54. I tried a bunch of batteries but it does it on all of them.

In the village where I put the same one but without WiFi, the clock goes correctly without losing minutes.

I can't understand all those who give them 5 stars. They promote them because they are Greek. The temperature it shows is 2 degrees higher than normal. Their software is outdated. I will ask for a replacement next week. The cheap Chinese ones are 100 times better than them. STAY AWAY

Very good thermostat, accurate. It solved my problem with cold bedrooms far from the old thermostat because it is wireless. Now I can adjust the temperature in the room I want. It is also wifi-enabled, so I can turn on the radiator and the boiler whenever I want through the app, even when I am not at home, having direct control over the space. Many advantages and settings. Easy connection even for beginners. Excellent user instructions. Overall, a very good choice. Congratulations to Olympia Electronics.

Excellent and very good after-sales customer service. I needed connection instructions and the help was immediate and very detailed. I have had the thermostat for the last month and it is excellent. It has solved my problems.

Finally, a wireless digital thermostat with precision and a small differential, now also with internet remote control.