Servisná kniha VGSK is an electronic service book developed by Vaillant Group Slovakia for users of Vaillant and Protherm heating devices. The application provides information about warranty periods, service interventions, and annual inspections. Users can receive notifications of changes in records and annual inspections through notification messages.

The app's user interface is user-friendly and straightforward, making it easy for users to navigate and find the information they need. The app also includes a search function that allows users to quickly find specific information. The application is free to download and use, making it a valuable tool for Vaillant and Protherm heating device users.