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we are doing a geo-thermal job right now .they are drilling the wells 300ft deep there will be 36 wells .this is one type they use
there is another that they use a ditch witch to dig a deep trench then lay is a slinky of pipe [ a pipe that is coiled ] then they fill the trench with a grout type material to adsorb and dissipate the heat .
they can also drill a well for water and pull the water out of the well and then return it in a 2nd well [ not used that much ]
then if you have a large pond you can lay a slinky type at the bottom to do the same [ this two is not used much ]