Yesterday we watched a couple episodes of This Old House, and they were putting radiant heating under the driveway and the walk up to the house... how posh is that? ;~)
I've seen that!
I'm applying heating to my back right now! LOL!
I have a large blister on my finger.
They put an anti-freeze type liquid in those pipes under driveways! They'd be great for under stairs leading to the front door, too, so you don't slip on ice when going out to get the mail!