Another question that came up; "Are heat recovery chillers used in any new buildings for space heating?"
The application seems so rare altogether, that it seems unlikely. As I stated earlier, I had never heard of them until I read about a system that was installed in an older building in my area. I have never seen any in person. Given their obscurity, perhaps they fell out of fashion because a boiler is used as a supplement? Or perhaps they fell out of use for the same general reasons that boilers and hydronic heating have.
I no others stated otherwise, yet I believe one reason hydronic heat has fallen out of favor is because of the piping. With electric strips, you have no steam or hot water supply/return piping.
Comments are appreciated.