Home

Disclaimer

First of all: a huge disclaimer! Nothing described here is in any way approved or endorsed by Remeha. Connecting anything to the boiler could have unexpected results. I have not encountered any issues, but there is no public documentation by Remeha that states that what is described here, is possible and can be done without any consequences. If you decide to use the methods and software described here, you are doing so on your own risk!

All the findings described here are my interpretations and are the result of reverse engineering of the data. The scripts and documentation on this site come with ABSOLUTELY NO WARRANTY!

Documentation

1. Hardware. Description of the hardware I'm using.
2. Raspberry Pi setup. Setting up the Raspberry Pi to receive data from the Calenta Ace's CAN bus.
3. Analysis. How I found the information I wanted from the data stream coming from the CAN bus.
4. The scripts. Information about the BASH shell scripts that read data from the CAN bus and write it to a JSON file.
5. Webserver. Information on setting up a webserver on the Raspberry Pi. This will be used by Home Assistant (running on another machine) to retrieve the data from the Calenta Ace.
6. Home Assistant. How to configure Home Assistant to use the data from the boiler.