ribit, In the early '60s, one of our neighbors had something like that. The basement level in the house was flush with the garage. He had a couple of rooms down there that were finished and he had some kind of heating system in the floor. I don't know how it worked, whether it was a water system. We had baseboard heating that was a closed-loop water system, I think.
Guess innovation's alive and well. Let's hope someone stumbles on something to save us from ourselves.