As noted above, pond loops really have very little affect on the pond. The additional loop and making sure there are lots of spacers in the loops has made all the difference in how our geo runs. It's is comfortable and even with single digit temperatures, it ran beautifully. We have a Honeywell thermostat that shows when your heat strips kick on--we changed ours out to one last year and highly recommend one. Thus far this year, the geo is running absolutely great.
Dwight, all your costs was right in line with ours and I'm figuring a 5 year payback. The only thing is once you get out of warranty, if you need service, the service for a specialized tech is on the high side of things compared to your older system. Oh, well....dot
