Welcome to the forum LM.

What is the average depth of your pond? For the sake of argument let's call it 5 feet. That would be 1.6 acre/feet of water or about half a million gallons. What is your geothermal feed gpm? In my opinion it would have to be pretty significant flow to impact half a million gallons. My 1/7 acre pond has an inflow of 18 gpm and it barely impacts the water temperature at all. Maybe two degrees or so. As far as temperature goes I doubt if any geothermal feed would do much more than provide some beneficial fresh water. Is there any other information you can provide us?

Bruce


Holding a redear sunfish is like running with scissors.