It seems like AC_Hacker has gotten the HP part pretty well under control. Am I right? Now the big obstacle is the GS part. That's always the big issue with geothermal. I think that in order to really get this all working well someone is going to have to figure out how to DIY a down the hole hammer. I fear that it will take way too many 20' holes to get this all working on any kind of large scale. Can one just buy a down the hole hammer to go on the end of one of these shafts?
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