I accually put it under all three of my washys, figured they would need the boost the most in winter/spring. One of these days I'll let you know about the ground temps. When my girlfriend and I get married and we sell our houses I'm going to build us one. I should be able to incorperate some interesting ideas into the house I would think. One idea is geo thermal heat, I could think of a bunch of fun ideas like a out door zone for my planting beds 😯 It's no different than heating a driveway except that's what plow trucks are for. How cool would that be! Maybe using the discharge water somehow too. I can't wait to move!

Bill