
Hans Testus
App doesn't support switch of language, always takes the device language with no option to configure. standard nowadays is that you can set this within the app settings of the Android system. Also missing: option to manually start heating, just like I can manually start hot water. At this time of the year, one doesn't need the heating all day, but sometimes just want to turn on the heating. Doesn't sound like an unusual request. But it's not possible, I have to change time plans...

Matthew Corum
I have spoke with customer service and went through all of their steps on the phone and no one could get it to connect to the app even though the wifi finds the boiler. Now 8 months later after various app updates, nothing is fixed and it still won't establish connection with the app. Always finds the boiler via wifi but the ViCare app will just say searching for device or whatever. This is probably the worst app I have dealt with with even cheap products having no problem pairing to an app.
7 people found this review helpful

Drew Mills
The controller unit has a very poor antenna which does not work on my main house Wi-Fi connection even though several other devices nearby work well. It is not possible to change settings when the device is offline and then take effect when the device comes online next time. There is no option to turn the hot water on for 10 minutes with a single press. Designed by engineers without sufficient consultation with real world users. Fiddly HCI.
1 person found this review helpful
Viessmann IT Service GmbH
April 10, 2026
Hello Drew Mills. We apologize for the inconvenience. Please send a description of the issue, screenshots/photos, and the communication module’s serial number to customer-contact+DrewMills1004@viessmann-climatesolutions.com. This will help us assess the situation thoroughly and provide an appropriate resolution.