I looked at my dealers time saver and it looked like it had one piece of bubble wrap and tin foil around it in a drain tile. They wanted $8 a foot.:jawdrop:
I now am making my own. It will be in a 6 inch drain tile with 5.75 inches of solid insulation that will hold up to 1 1/4 in. pex. The pipe are seperated to eliminate pipe to pipe heat transfer. I am going to test it out this year by not buring it and checking for snow melt. I don't think I will have any so I won't have to trench deep this spring.
The best part is it only cost $4.65 a foot.