I am designing a rig for shallow boreholes that fits in a knapsack on storage for campers and people who prep . I bet people that do the diy geothermal can bore a hole for vertical loopholes or a open loop geothermal. Only thing deepest i have tested it was around 60 ft. Rock it would be useless. I am trying to make it cheap as possible but durable so i can 3d print parts for it.
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