I do not know how to make a table with 12 columns (representing the months), but it is probably possible with some further effort.
Here is a bar chart with data by month. In your case, the two colors would correspond to Warmwasser and Heizung. In my case, I am grouping by region (which is a tag in my data) and measurement (called “demand data”). I am not sure how you have structured your fields and tags, but you would probably do something similar if you are content with a bar chart with monthly values.
