Pond Boss Forums AERATION Systems questions GEO Lines in Pond with Aerator??

True, but if you did a loop that used 55 degree ground water for your geo system, the heat pickup as it goes in the house and cools your house and then delivers that heat outside is only a few degree gain in water temp. If you could dump all that water at 57 degrees into the pond, you would keep your bottom water cool which is a plus. Then your aerator could keep mixing the cool on bottom with warm on top to prevent stratification. The cooler water carries more oxygen which is beneficial.

Most people want closed loop geothermal to have less maintenance but open loop can be helpful in this regard. In the winter the ground water gets a few degrees cooler as it delivers its heat to your house and again could be easily dumped in the pond, or if you wanted to ice skate on the pond and didn't want the 'warmish' water in the pond you could have a diverting valve and divert the winter time output to another site in the woods etc. I know my brother's open loop system is very popular in the winter as the flowing water is a big draw for deer, birds and other critters as it is a good source of flowing water when the deep freeze hits.