The most common plastic pipe used in geothermal ground source heating systems is

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PE (polyethylene) is the best choice for geothermal ground source heating systems because it is durable, resistant to chemicals, and can withstand high temperatures and pressures. It also has a low thermal conductivity, which means it does not lose heat as easily as other pipes, making it more efficient for energy transfer in heating systems. CPVC, PVC, and ABS are not appropriate choices for geothermal ground source heating systems due to their limitations in temperature and pressure resistance, as well as their lower thermal conductivity.

The Most Common Plastic Pipe Used in Geothermal Ground Source