Used Hard/Software:
Home Assistant Frontend 20240806.1
Core 2024.8.0
Supervisor 2024.08.0
Operating System 12.4

HA-Integration: Bosch custom component v0.26.1

It was a hard time to find the right Grafana-settings to get the water-temperature presented.
Bosch/Home-Assistant transports this value based on the state-series:

Hence Grafana needs a statement as shown:

Example output:

Done 🙂