Build your own app for free. Pay as you grow.


We have options that fit your needs now and into the future.

The basic usage of the Developer Portal is free of charge. Use the API to integrate your Viessmann device into other (third-party) smart home applications or start developing your own solution. With our API, you can for example to visualize data in your own customized way, change the operating mode and connect your Viessmann heating system with other devices.


Start building for free

We offer you free access to basic functionalities with a limited number of API calls, which allows you to immediately start integrating and developing your application.

Get started

We are looking for partners

Are you an enterprise that is looking to partner with us to integrate Viessmann devices into your ecosystem? We are happy to get in contact with you!

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Pricing & Plans

Your plan

The basic usage of the Developer Portal is free of charge. If you are looking for more functionalities and/or a higher number of API calls, we will soon offer you different plans that perfectly match your needs.

Note: We reserve the right to charge a fee for the use of specific APIs and/or change the limitation of number of free API calls.


Price per month0 €
Free calls per day1450
Number of API clients1
Basic heating system functions
Ventilation functions
Domestic hot water functions
Service documents
Private use
Commercial use -
More information

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