Quote:
Originally Posted by randen
For our area of the planet South Western Ontario Canada the common rule of thumb is 600' of tubing placed 6' deep Horizontal for each ton required. Local installer rely on this for their installations.
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Good rule of thumb to remember
(I am close enough to your geologically). IIRC, you said your tubes were at least 500cm apart.
I suspect that rule does not apply to vertical wells.
(4 ton would be 2400' 
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