Submitter's message Please note that a new version of this document has just been published. NSF employees will be able to view it in MasterControl (document #18959); others can use the link below. Thank you for your contributions to this document! -- Emily Richardson Document Name : NSF/ANSI 358-4-2022: Polyethylene of Raised Temperature (PE-RT) Tubing and Fittings for Water-Based Ground-Source (Geothermal) Heat Pump Systems Description The physical and performance requirements in this Standard apply to plastic piping system components as well as non-plastic components of the ground loop heat exchanger including but not limited to polyethylene of raised temperature (PE-RT) tubing and fittings used in water-based ground-source heat pump systems. This standard does not cover refrigerant-based ground loop heat exchangers such as direct expansion (DX) systems. This Standard does not cover hydronic heating or cooling systems within buildings. Download Latest Revision Submitter : Emily Richardson Group : Joint Committee on Plastics and RV Plumbing Components Folder : Standards Date submitted : 2022-08-03 13:08:10 Revision : 1