Oh, I see! Yes, to the best of my knowledge, that's how it is. But think about it carefully. Financially, it’s no longer worth it today; with modern air-to-water heat pumps, you now have a seasonal performance factor of 4-5. The only reason would be aesthetics and/or space.
Also in der Liste der förderfähigen Anlagen der BaFa steht sie drin.
Oh, strange, I thought it wasn’t on the list back then, which is why I actually went for the rather generous 75/6.