I have been considering and reading about systems for a while now, and it seems like the perfect type of system if you have a place to loose the heat like a pond or abundant well. I have learned a lot about them, but have not yet seen a spec on the output water temp, or the heat rise of the system.
Now, I know that plastic isn't a very good conductor of heat, so it makes sense that it would take a lot of submerged plastic pipe to loose 3 or 4 tons of heat. I'm just surprised to hear 900 feet!
That's still why I like my copper radiator idea. I guess I need to do some reasearch into the heat transfer characteristics of PVC and copper. Pretty exciting, huh?
