High Density Polyethylene Pipe has been the choice of the geothermal industry for several years. Excellent physical properties such as flexibility, corrosion resistance, and fusibility mean that HDPE piping systems are preferred material for this application. HDPE pipe has proven to perform excellent under all temperatures and conditions associated with geothermal loop applications. The reliability of HDPE pipes comes from the method of pipe joints called “Thermal Fusion”. This method creates an integral system with no stress points for problems. HDPE pipes have been a low cost, long service life product, which has made a perfect fit for the geothermal industry. HDPE heat fusible pipes are available in coils and come in a variety of diameters and lengths to fit the applicable needs. Many geothermal customers use HDPE pipe for closed horizontal, vertical loops, closed pond loops systems, and open loop systems where high quality and good heat transfer are crucial.