NSF 358-2-2017

This Standard establishes the minimum physical and performance requirements for plastic piping system
components. These criteria were established for the protection of property, public health and the
environment.

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 pipes
and fittings used in water-based ground-source heat pump systems This Standard is intended for ground
loop heat exchangers with a maximum temperature and pressure of 140 °F (60°C) at 100 psi. Waterbased
ground-source heat pump systems commonly include the use of anti-freeze, heat transfer fluids or
other chemical additives. 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.