Other than the fact that PEX is not a thermoplastic (weldable) like HDPE is, it's great for Ground loops.
It might more expensive than PEX, but PEX actually starts out life as HDPE.
Regarding shark bite vs. barbs & rings, I have tried barbs and rings, both compression copper rings, and stainless steel 'clinch' rings. I think the clinch rings are superior in every way... even to corrosion.
-AC
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I'm not an HVAC technician. In fact, I'm barely even a hacker...
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