Geothermal piping systems standard NSF/ANSI 358-1 evaluates safety and performance of polyethylene piping

ANN ARBOR, Mich. — NSF International, an independent global organization that writes standards, and tests and certifies products for the water, food, health sciences and consumer goods industries, has published the first in a series of American National Standards for Ground-Source Geothermal Piping Systems – NSF/ANSI 358-1. This new standard, which will be referenced in the 2015 International Mechanical Code, provides engineers, regulators and users assurance that certified geothermal products meet minimum performance and safety requirements, reducing potential liability, and increasing confidence and product acceptance in the marketplace.

Geothermal heat pump systems provide heating or cooling by moving heat, rather than by creating heat such as conventional systems like furnaces do. While conventional heating systems rely on outdoor temperatures that may often vary, underground temperatures remain relatively constant; hence geothermal systems can produce the desired heating and cooling temperature year round.

Geothermal piping systems have gained popularity in recent years for residential and commercial building applications for their innumerable benefits such as low operating costs and environmental impact, long-term durability and ease of retrofitting. The International Ground Source Heat Pump Association (IGSHPA) reports that geothermal heating systems can reduce energy consumption by 20-50 percent and last up to 50 years.*

To help support the acceptance of this technology, NSF International worked with expert engineers, piping manufacturers, and academic and regulatory representatives to develop the consensus-based standard. NSF/ANSI 358-1: Polyethylene Pipe and Fittings for Water-Based Ground-Source “Geothermal” Heat Pump Systems establishes minimum physical and performance requirements for geothermal piping system components, including long-term strength and quality control requirements that are key to ensuring product performance in the field. Additionally, the standard incorporates key requirements from standards developed by the American Society for Testing and Materials (ASTM), Canadian Standards Association (CSA), and the American Water Works Association (AWWA).

“This new NSF American National Standard helps manufacturers and regulators and provides a credible, science-based foundation for the expanding geothermal pipe industry to gain acceptance in the marketplace,” said Nasrin Kashefi, General Manager of NSF International’s Plumbing programs. “Manufacturers that earn certification to NSF/ANSI Standard 358-1 will help increase confidence and product acceptance by ensuring geothermal pipe complies with all of the standard’s requirements.”

“Having a consensus-based standard developed by an independent third party is essential for the continued growth and acceptance of geothermal technology by local regulatory officials.  As we have seen this industry grow, so has the awareness level by local officials who look to organizations like NSF International for verification of compliance of the various system components.  This new standard should help the industry gain credibility within the appropriate model codes and should prove to be a good blue-print for other materials for similar use as this technology matures,” said Allan Skouby at GeoPro, Inc. who has nearly 30 years of experience in geothermal technology.

To learn more about NSF International testing and certification services for water treatment and distribution products, contact americas@nsf.org or visit NSF’s water programs web page. You can also email europe@nsf.org, asia@nsf.org, brasil@nsf.org and info@nsf.org.cn (China) for additional information.

Editor’s note: To schedule an interview with Nasrin Kashefi, General Manager of NSF Plumbing programs, contact Greta Houlahan, Senior Communications Manager, at houlahan@nsf.org or 734-913-5723.

About NSF International: NSF International is a global independent organization that writes standards, and tests and certifies products for the food, water and consumer goods industries to minimize adverse health effects and protect the environment (nsf.org). Founded in 1944, NSF is committed to protecting human health and safety worldwide. NSF is a World Health Organization Collaborating Centre for Food and Water Safety and Indoor Environment.

NSF led the development of the American national standards for all materials and products that treat or come in contact with drinking water. In 1990, the U.S. EPA replaced its own drinking water product advisory program with these NSF standards. Today, all major plumbing codes require certification to NSF standards for pipes and plumbing components in commercial and residential buildings. NSF International is accredited by the American National Standards Institute (ANSI).

Additional NSF services include sustainability standards development, claims and product verification through NSF Sustainability; food safety and quality programs through the NSF Global Food Safety Division; and testing and certification programs for bottled water and beverages, dietary supplements and consumer product industries.

* Source: The International Ground Source Heat Pump Association (IGSHPA) http://www.igshpa.okstate.edu/geothermal/residential.htm

Contact: Greta Houlahan
NSF International
+1 734-913-5723
houlahan@nsf.org