[Add-on] MyThermowatt Smart Boiler MQTT Bridge

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Hi everyone,

I’m excited to share a new Add-on I’ve developed to bring MyThermowatt Smart Boilers into Home Assistant locally via MQTT.

If you have a boiler that uses the MyThermowatt Wi-Fi module, you’ve likely noticed it’s a bit of a “walled garden.” This bridge connects to the MyThermowatt cloud and exposes your boiler as a standard water_heater entity in Home Assistant, allowing for full local automation and dashboard control.

Key Features:

  • Full Climate Control: Set target temperatures and toggle between Manual/Auto/Off modes directly from the Thermostat card.
  • Real-Time Monitoring: Track current water temperature, target setpoints, and system status.
  • Automatic Discovery: Uses MQTT Discovery to instantly create your boiler device—no YAML configuration required for the entity itself.
  • Diagnostic Sensors: Includes sensors for error codes and heating status.

Installation:

  1. Add my repository to your Add-on Store: https://github.com/waterheater-dev/ha-thermowatt-heater.
  2. Install the Thermowatt Smart Boiler add-on.
  3. Enter your Thermowatt credentials in the configuration tab.
  4. Enjoy local control!

GitHub Repository: https://github.com/waterheater-dev/ha-thermowatt-heater

Huge thanks to the community for the inspiration. Feedback, bug reports, and model compatibility info are all welcome on the GitHub Issues page!