It is the only town In NRW that can boast to be both a state recognised spa and a climatic spa

It is the only town in NRW that can boast being both a state-recognized spa and a therapeutic-climate health resort.

Though I'm still not entirely sure what "heilklimatisch" really is.

Dictionary: praedikat

Somehow I'd work "title" into it.

... that has the dual title of ...

???

e.g.: It is the only town that has the privilege to bear both the title of state-recognized spa as well as that of climatic health resort.

or: It is the only town that holds both the title of...