Yes, you can! All you need is an Amazon Echo smart home assistant, a Viessmann heating system and the ViCare smartphone app.
Viessmann provides an integration into the Amazon Echo platform. This is called "Skill" and enables voice control of Viessmann heating systems. After initiation via the Amazon Alexa App, the service can be used. Depending on the installed components, this control can be carried out by the user on a Heating Circuit or room level.
Please download and install the Amazon Alexa for your device type:
Then enter the keyword "Viessmann" under "Skills - Search" in the app. Select the Skill and click "Start", then follow the instructions in the app.