Great idea!
I think you will be a bit short in hole depth unless maybe you are in ground water for a good portion of your 30 ft. It may be tho that since domestic hot water use is intermittant, your loop may have time to "recover" between runs.
A cool shower is not as bad there as here in winter!
If going deeper is not a huge problem while you're set up - I'd sure do that.
Of course if that didn't work you could always do another 30 footer and add on.
The other thing that I wonder about is the 60 ft plus of 1/4" evap tubing - thats a small diameter for that length even for 5000 btu.
Good luck and take pics!!!
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