Thanks to many of you and a lot of reading and pricing, I'm closing in on my geo package.  I do have one more questions if any of you have this method.  I know in the closed loop system they put the pipe loops in the pond; properly fused--I shouldn't have any problems.  Life estimated 50 years (beyond my time).  Anyway, I am wondering if any of you ever experienced any leaks/problems with and/or method that would be used to fix such.  Also leaks in Pond, hazard to fish or small qty insignifcant.    I'm still very much looking at Water Furnace, desuperheater and some other options and the closed loop in the pond.  I'm closing in on pricing and getting my 'ducks in a row 'as far as what grants/savings are out there to be had (ie.  State/Tax/Utility Companies etc.).  Want it done right, want the savings, want to get it done by a reputable contractor.  All of you have been great with answering me while I am investingating all my options. dot