Besides, I would suggest to add the `heritage` tags, since the building seems to be "denkmalgeschützt".
New tags: heritage=4 + heritage:operator=BLfD + ref:BLfD=N

Source: https://geoportal.bayern.de/denkmalatlas/searchResult.html?koid=29559&objtyp=bau&top=1 where it also has the ID D-1-84-119-8

However, the source does not contain an explicit name, it only lists the function (Wasserturm).