Pond Boss Forums Thread Like Summary - Geo-thermal HVAC system going in the lake

Next week we are putting the heat exchanger for my new HVAC geo-thermal system into the lake. Rather than loops of tubing, we are using stainless steel plate radiator (https://awebgeo.com/). It's going in about 13.5' feet of water. Generally they claim you need about a 1/4 acre pond with 10' of depth to support one of these, so it should have zero impact in a 50 acre lake, especially with the amount of flow through water exchange we have.

I was going to put a geothermal system at our cabin. We have a large lake. Thought of putting the pipe coils in lake. Then changed to a pit idea. Dig large hole ( 10 feet deep) in bottom of the lake, then put intake pipe in hole so you would bring in lake water to system, cover with gravel to filter water. This would be just like a water well. The cold or hot water would then be put back in the lake at another spot to not affect the temp of incoming water. Then would also put an extra air hose in hole that would have lots of holes in it, so you could pump a lot of air through ( 100 cfm or more ) to clean the gravel of sediment when it would need cleaning. Was sure this would of worked but lake filled before we got to putting in. We have a lot of clay in our ground, do not need to worry about pond liner.
This was just my idea not a proven system so not to buy a lot of pipe or a radiator system that could be caught with fishing hooks. But could be changed over if it would have not worked. Also remember everything would need to be below the frost line.