Open3E

Connects Viessmann E3 heat pump/boiler controllers via CAN or DoIP for local data access and smart-home integration.

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Open3E is a free, open-source tool that connects Viessmann E3-based heat pump and boiler controllers, such as Vitocal or Vitodens, over a local CAN bus or DoIP interface instead of the manufacturer's cloud. It reads and writes device data points and can publish that data over MQTT, with integrations for Home Assistant, ioBroker, and Node-RED. It's aimed at owners of these heating systems who want local, cloud-independent access to their device's data for monitoring or automation.

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