Geothermal Piping Systems

NSF has been testing and certifying many different kinds of plastic piping and plumbing components for over 50 years.

To help ensure the utmost quality and efficiency for geothermal piping systems, we facilitated the development of a series of American National Standards. These standards define minimum physical and performance requirements and establish product testing, long-term strength and quality control requirements. Each standard addresses particular types of polyethylene and piping fixtures and fittings, all with geothermal end-uses. Clients only need to be certified to the standard that applies to their product.

The standards are:

  • NSF/ANSI 358-1: Polyethylene Pipe and Fittings for Water-Based Ground-Source (Geothermal) Heat Pump Systems
  • NSF/ANSI 358-2: Polypropylene Pipe and Fittings for Water-Based Ground-Source “Geothermal” Heat Pump Systems
  • NSF/ANSI 358-3: Cross-linked polyethylene (PEX) Pipe and Fittings for Water-Based Ground-Source “Geothermal” Heat Pump Systems
  • NSF/ANSI 358-4: Polyethylene of Raised Temperature (PE-RT) Pipe and Fittings for Water-Based Ground-Source “Geothermal” Heat Pump Systems

This standard series requires quality control testing at your manufacturing site to help your company display continuous compliance and product performance to your customers. Certification to any NSF/ANSI 358 standard satisfies requirements of the International Mechanical Code (IMC) and the Uniform Mechanical Code (UMC).

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