How durable is the pipe in the ground loop?
The CSA standard allows only high-density polyethylene pipe, with the three most common diameters being 0.75″, 1.0″ and 1.25″. Sections of pipe are heat fused and many suppliers offer a warranty of 25 years. The resin in this pipe is the same used in the pipe used to transport natural gas. This plastic does not degrade under sunlight and is warranteed not to fail.
