Help on: GitHub - GrogSym/solarimmersion: excess solar to hot water tank via home

Hello,
I found the following example to use my excess of solar energie to heat the hot water tank:

With the info given and the 2 files to use I do not get it working.
Has somebody succeded in using this and could help me out with the steps to take to get it working.
When I copy the file to my configuration.yaml I get errors about a missing templete and platform

Best regards, Har