I just turned on my slab after building the boiler system..I ran the hpex pipe in the slab years ago when I built my garage. With the electric boiler it is a pretty neat little package.

http://i65.photobucket.com/albums/h222/ecumsecumguy/IM003095.jpg

I highly recommend it fer yer dream garage for those northeners. Radiant heat is different but nice.