Woops! lol!

The power that I was going to go for was 250w, but that doesn't explain the amount it uses per hr.

Tiff, I thought that too, but I seem to remember this program all about building the most state-of-the-art, environmently-friendly home (it was like a 12 part series) where they built the home from scratch.
They had underfloor heating installed.

Since heat rises, it kinda makes sense, similar to radiation - tell me if I'm wrong.