Geothermal Piping Systems


NSF has been testing and certifying plastic piping and plumbing components for over 50 years. In 2012, we introduced a new American National Standard for geothermal piping systems, NSF/ANSI 358-1: Polyethylene Pipe and Fittings for Water-Based Ground-Source (Geothermal) Heat Pump Systems. NSF/ANSI 358-1 determines minimum physical and performance requirements for geothermal piping system components and establishes product testing, long-term strength and quality control requirements to help ensure product performance in the field.

Benefits of Certification

NSF certification of geothermal piping systems and components provides engineers, regulators and users the assurance that the product meets the appropriate end-use requirements. Certification by an independent third party reduces potential liability, increases confidence and product acceptance, and helps ensure product consistency. NSF’s program is the most recognized and widely accepted certification program for geothermal piping systems in North America.

Why Work With NSF?

The NSF mark, well respected by public health officials and drinking water utilities, is recognized as a symbol of product quality and integrity. Our responsive, personalized service quickly guides your products through the certification process, ensuring that they get to market on time and on budget. We offer product bracketing services wherever possible to help keep costs down, and provide pricing up front so there are no hidden surprises down the road.

NSF certification is used to demonstrate compliance with the International Mechanical Code and Uniform Mechanical Code.

NSF is accredited by the Standards Council of Canada (SCC) to list products to CSA C448: Design and Installation of Earth Energy Systems. These listings are accepted in all Canadian provinces and territories.

Certification Process

While our product evaluations are thorough, our process is simple and efficient. A dedicated NSF project manager serves as your single point of contact from application to approval for a streamlined, efficient certification process.

1. Your company submits an application.

2. Your company and suppliers provide formulation, design specifications and product end use information.

3. We review formulation and engineering specifications.

4. We perform a plant audit and sample collection.

5. We conduct laboratory testing.

6. We grant certification for compliant products.

7. Our follow-up program includes unannounced inspections and annual testing.

Our experts can help you reduce your overall costs and expedite your time to market by bundling services and reducing the number of contracted service providers and facility audits.