• Sign In
  • Create Account
  • Sign Out
  • My Account
  • NEWS
  • PRODUCTS
  • CONTRACTORS
  • ENGINEERS
  • RADIANT & HYDRONICS
  • INSIGHTS
  • MEDIA
  • RESOURCES
  • EMAGAZINE
  • SIGN UP!
cart
facebook instagram twitter linkedin youtube
  • CONTRACTORS
  • BATH & KITCHEN PRO
  • BUSINESS MANAGEMENT
  • HIGH EFFICIENCY HOMES
  • TECHNOLOGY
  • WATER TREATMENT
  • PMC COLUMNS
  • PMC COLUMNS
  • Dave Yates: Contractor’s Corner
  • John Siegenthaler: Hydronics Workshop
  • Kenny Chapman: The Blue Collar Coach
  • Matt Michel: Service Plumbing Pros
  • Scott Secor: Heating Perceptions
  • ENGINEERS
  • CONTINUING EDUCATION
  • DECARBONIZATION | ELECTRIFICATION
  • FIRE PROTECTION
  • GEOTHERMAL | SOLAR THERMAL
  • PIPING | PLUMBING | PVF
  • PME COLUMNS
  • PME COLUMNS
  • Christoph Lohr: Strategic Plumbing Insights
  • David Dexter: Plumbing Talking Points
  • James Dipping: Engineer Viewpoints
  • John Seigenthaler: Renewable Heating Design
  • Lowell Manalo: Plumbing Essentials
  • Misty Guard: Guard on Compliance
  • RADIANT & HYDRONICS
  • RADIANT COMFORT REPORT
  • THE GLITCH & THE FIX
  • INSIGHTS
  • CODES
  • GREEN PLUMBING & MECHANICAL
  • PROJECT PROFILES
  • COLUMNS
  • SPONSOR INSIGHTS
  • COLUMNS
  • Codes Corner
  • Natalie Forster: Editorial Opinion
  • Guest Editorial
  • MEDIA
  • PODCASTS
  • VIDEOS
  • WEBINARS
  • RESOURCES
  • INDUSTRY CALENDAR
  • DIRECTORIES
  • EBOOKS
  • PM BOOKSTORE
  • CE CENTER
  • MARKET RESEARCH
  • CLASSIFIEDS
  • EMAGAZINE
  • EMAGAZINE
  • ARCHIVE ISSUES
  • CONTACT
  • ADVERTISE
  • PME EMAGAZINE ARCHIVES
search
cart
facebook instagram twitter linkedin youtube
  • Sign In
  • Create Account
  • Sign Out
  • My Account
  • NEWS
  • PRODUCTS
  • CONTRACTORS
    • BATH & KITCHEN PRO
    • BUSINESS MANAGEMENT
    • HIGH EFFICIENCY HOMES
    • TECHNOLOGY
    • WATER TREATMENT
    • PMC COLUMNS
      • Dave Yates: Contractor’s Corner
      • John Siegenthaler: Hydronics Workshop
      • Kenny Chapman: The Blue Collar Coach
      • Matt Michel: Service Plumbing Pros
      • Scott Secor: Heating Perceptions
  • ENGINEERS
    • CONTINUING EDUCATION
    • DECARBONIZATION | ELECTRIFICATION
    • FIRE PROTECTION
    • GEOTHERMAL | SOLAR THERMAL
    • PIPING | PLUMBING | PVF
    • PME COLUMNS
      • Christoph Lohr: Strategic Plumbing Insights
      • David Dexter: Plumbing Talking Points
      • James Dipping: Engineer Viewpoints
      • John Seigenthaler: Renewable Heating Design
      • Lowell Manalo: Plumbing Essentials
      • Misty Guard: Guard on Compliance
  • RADIANT & HYDRONICS
    • RADIANT COMFORT REPORT
    • THE GLITCH & THE FIX
  • INSIGHTS
    • CODES
    • GREEN PLUMBING & MECHANICAL
    • PROJECT PROFILES
    • COLUMNS
      • Codes Corner
      • Natalie Forster: Editorial Opinion
      • Guest Editorial
    • SPONSOR INSIGHTS
  • MEDIA
    • PODCASTS
    • VIDEOS
    • WEBINARS
  • RESOURCES
    • INDUSTRY CALENDAR
    • DIRECTORIES
    • EBOOKS
    • PM BOOKSTORE
    • CE CENTER
    • MARKET RESEARCH
    • CLASSIFIEDS
  • EMAGAZINE
    • EMAGAZINE
    • ARCHIVE ISSUES
    • CONTACT
    • ADVERTISE
    • PME EMAGAZINE ARCHIVES
  • SIGN UP!
Radiant & HydronicsRadiant Comfort Report

Radiant Comfort Report

Development of the 2021 Uniform Solar, Hydronics & Geothermal Code

By Les Nelson
The Uniform Codes

The Uniform Codes are designed to set the standard for safe plumbing, heating and mechanical systems while, at the same time, allowing latitude for innovation and new technologies.

November 15, 2019

Every three years the International Association of Plumbing and Mechanical Officials publishes a revised and updated version of its signature codes — the Uniform Plumbing Code and the Uniform Mechanical Code. These “model codes” are used by many states, and in some cases, individual municipalities as the basis for their own codes governing the installation and inspection of plumbing and mechanical projects in their jurisdictions. The Uniform Codes are designed to set the standard for safe plumbing, heating and mechanical systems while, at the same time, allowing latitude for innovation and new technologies.

IAPMO’s code development process is governed by its 2021 Consensus Code Development Cycle: Bylaws, Regulations, Procedures and Guidelines. IAPMO’s Uniform Codes are unique in that they are also American National Standards, meaning that IAPMO’s procedures have been approved by the American National Standards Institute in recognition of its adherence to a strictly-defined “consensus” process.  Consensus is defined in ANSI Essential Requirements: Due process requirements for American National Standards as follows:

“Consensus means substantial agreement has been reached by directly and materially affected interests. This signifies the concurrence of more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that an effort be made toward their resolution.”

Another less well-known model code is IAPMO’s Uniform Solar, Hydronics and Geothermal Code. The USHGC is also undergoing its three-year update at this time in preparation for a 2021 release, and the new version is expected to have considerable enhancements to the hydronics and geothermal provisions once the code development process is complete. A short description of IAPMO’s process for developing a new version of an ANS is as follows.

  • A public announcement of IAPMO’s intent to revise an ANS is made publicly via press release and via ANSI’s Standards Action weekly newsletter. This announcement includes a call for proposed changes to the standard. Anyone can propose a change to an ANS.
  • At the same time, a call for volunteers to become  members of a Technical Committee to participate in the development goes out. For the USHGC TC, IAPMO sought  manufacturer, user, installer/maintainer, labor, research/standards/testing laboratory, enforcing authority, consumer and special expert members.
  • IAPMO issues a notice of public availability of a “Monograph” containing all of the proposed changes to the code, accompanied by a notice of the first in-person meeting of the TC where each of the proposals will be considered. Anyone can attend a TC meeting, and those materially affected are encouraged to participate.
  • In the case of the June 2019 USHGC TC meeting, the committee acted on 75 public proposals and generated one Technical Committee proposal. Topics discussed included chemical additives and corrosive fluids; pressure and safety devices for hydronic systems; water-source and air-source heat pumps; insulation thickness requirements for solar thermal system piping and tubing; closed-loop and DX geothermal systems; material and installation provisions for geothermal systems; and new listing requirements for PV systems.
  • Following the TC meeting on Sept. 9, a document known as a “Report on Proposals” was publicly released by IAPMO. This document includes a description of the TC action during the June meeting on each of the proposals submitted, along with a copy of the 2021 USHGC as it would read if it were published as per the TC actions. However, a public comment period began in October and ends in January 2020, during which anyone can submit comments on the ROP.
  • Final actions on the USHGC include another Report on Comments, another TC meeting in May 2020, balloting of the TC through June, and a finished product in the November timeframe to be published in early 2021.

HYDRONICS

The Hydronics section of the draft 2021 USHGC covers critical areas of topics addressing the installation, inspection and maintenance of liquid-based (hydronic) heating and cooling systems.  IAPMO is coordinating the provisions of the USHGC with its Uniform Mechanical Code so municipalities adopting the USHGC will avoid code conflicts. Hydronic heating and cooling systems are becoming the technology of choice for increasing numbers of net-zero energy building designs, based on higher efficiency and lower operating cost. To gain an understanding of the scope of the hydronics section of the code, following is the draft 2021 USHGC Chapter 4 Table of Contents:


Pre-print: Uniform Solar, Hydronics & Geothermal Code; Chapter 4 Hydronics

401.0 General

402.0 Protection of Potable Water Supply

403.0 Capacity of Heat Source

404.0 Identification of Piping Systems

405.0 Installation, Testing and Inspection

406.0 Heating Appliances and Equipment

407.0 Expansion Tanks

408.0 Materials

409.0 Joints and Connections

410.0 System Controls

411.0 Pressure and Flow Controls

412.0 Hydronic Space Heating

413.0 Steam Systems

414.0 Radiant Heating and Cooling

415.0 Indirect-Fired Domestic Hot-Water Storage Tanks

416.0 Snow and Ice Melt Systems

417.0 Piping Installation

GEOTHERMAL

Since residential and commercial geothermal heating and cooling systems are today being selected for the renewable energy component of HVAC construction projects, IAPMO believes that municipalities will see the value of incorporating a building code component developed by geothermal professionals which addresses the critical aspects of geothermal system design and construction. To gain an understanding of the scope of the geothermal section of the code, following is the draft 2021 USHGC Chapter 7 Table of Contents:

Pre-print: Uniform Solar, Hydronics & Geothermal Code; Chapter 7 Geothermal Energy Systems

701.0 General

702.0 Groundwater Systems

703.0 Design of Systems

704.0 Installation

705.0 Specific System Components Design

706.0 Ground-Heat Exchanger Testing

707.0 Heat Pump and Distribution System Design

708.0 System Start-Up

All of these proposed improvements to the code may be viewed at IAPMO’s Codes page at https://tinyurl.com/y26waxe5. Given that many aspects of hydronic and geothermal system design and installation are not covered in other codes, jurisdictions should seriously consider adopting the USHGC to assure that building officials have guidelines available to help them to assure quality for both residential and commercial end-users.   

KEYWORDS: codes and standards geothermal hydronics IAPMO renewable energy systems

Share This Story

Looking for a reprint of this article?
From high-res PDFs to custom plaques, order your copy today!

Les Nelson is the vice President of Radiant Professionals Alliance.

Recommended Content

JOIN TODAY
to unlock your recommendations.

Already have an account? Sign In

  • Worker using the Milwaukee Tool SWITCH PACK drain cleaner

    Pipeline profits: Drain cleaning, pipe inspection create opportunities

    Drain cleaning and inspection services offer lucrative...
    Plumbing News
    By: Nicole Krawcke
  • Uponor employee, Arturo Moreno

    The reinvestment in American manufacturing and training

    Plumbing & Mechanical Chief Editor Nicole Krawcke and...
    Plumbing News
    By: Nicole Krawcke and Natalie Forster
  • March 2024 Women in Plumbing hero image of woman engineer overlayed by circle of hexagon shapes with numbers from 1 to 10

    Celebrating 10 Influential Women in the Plumbing Industry

    Celebrating Women's History Month and Women in...
    Plumbing News
    By: Nicole Krawcke
Subscribe For Free!
  • eNewsletters
  • Online Registration
  • Subscription Customer Service
  • eMagazine
  • Manage My Preferences

NIBCO Press Solutions

NIBCO Press Solutions

Bell & Gossett Illustrates Path to Net-zero at AHR Expo

Bell & Gossett Illustrates Path to Net-zero at AHR Expo

IPEX celebrates grand opening of new Florida distribution center

IPEX celebrates grand opening of new Florida distribution center

AI can boost efficiency and profitability for plumbing, HVAC contractors

AI can boost efficiency and profitability for plumbing, HVAC contractors

More Videos

Sponsored Content

Sponsored Content is a special paid section where industry companies provide high quality, objective, non-commercial content around topics of interest to the Plumbing & Mechanical audience. All Sponsored Content is supplied by the advertising company and any opinions expressed in this article are those of the author and not necessarily reflect the views of Plumbing & Mechanical or its parent company, BNP Media. Interested in participating in our Sponsored Content section? Contact your local rep!

close
  • J.J. Keller CMV vehicles on road
    Sponsored byJ. J. Keller & Associates, Inc.

    The dash cam game-changer for small business safety

Popular Stories

Underfloor heating installation with drain sewer hole in bathroom close up on water floor heating.

Using hydronics to leverage time-of-use electrical rates

Watts Nexa mobile image

Behind the Wall: Where smart plumbing gets smarter

Six tankless water heaters that feed the nutraceutical manufacturer’s operations.

How to deliver large volumes of hot water quickly and intermittently

PMCE Home-X April 29 Free Webinar: From Legacy to Leadership: Preparing Your Home Services Business for the Next Generation

Events

November 13, 2024

Future Proofing MEP: Navigating the 2026 High Efficiency Water Heating Standards

Join our deep dive into DOE’s new standards so you can future-proof your MEP practice.

EARN: 0.1 ASPE CEU; 1 AIA LU/HSW; 0.1 IACET CEU*; 1 PDH

View All Submit An Event

Poll

Will business be up or down in 2025?

Do you anticipate business in 2025 to be up or down in comparison to 2024?
View Results Poll Archive

Products

The Water Came To A Stop

The Water Came To A Stop

See More Products

Download the FREE Water Conservation, Quality & Safety eBook: Plumbing Trends Increasing Safe Water Availability

Related Articles

  • IAPMO Logo

    IAPMO publishes 2021 editions of Uniform Plumbing Code, Uniform Mechanical Code

    See More
  • 2015 Uniform Solar Energy and Hydronics Code

    New solar and hydronics code will help radiant professionals

    See More
  • IAPMO solar and hydronics code

    IAPMO solar and hydronics code

    See More

Related Products

See More Products
  • what hydronics taught holohan.jpg

    What Hydronics Taught Holohan: A Memoir of Life in the Heating Industry

  • M:\General Shared\__AEC Store Katie Z\AEC Store\Images\Plumbing\new sites\classic_hydronics.gif

    Classic Hydronics - How To Get The Most From Those Older Hot-Water Heating Systems

  • 51CHeeKvw4L._SX322_BO1,204,203,200_.jpg

    Hydronic Radiant Heating: A Practical Guide for the Nonengineer Installer

See More Products

Events

View AllSubmit An Event
  • April 10, 2014

    Workshop: Hydronics for High Efficiency Wood-fired and Pellet-fired Boilers

    Session added to April 9-11 Northeast Biomass Heating Expo.
View AllSubmit An Event
×

Keep your content unclogged with our newsletters!

Stay in the know on the latest plumbing & piping industry trends.

JOIN TODAY!
  • RESOURCES
    • Advertise
    • Contact Us
    • Directories
    • Store
    • Want More
    • Supply House Times
  • SIGN UP TODAY
    • Create Account
    • eMagazine
    • eNewsletter
    • Customer Service
    • Manage Preferences
  • SERVICES
    • Marketing Services
    • Reprints
    • Market Research
    • List Rental
    • Survey/Respondent Access
  • STAY CONNECTED
    • LinkedIn
    • Facebook
    • Instagram
    • YouTube
    • X (Twitter)
  • PRIVACY
    • PRIVACY POLICY
    • TERMS & CONDITIONS
    • DO NOT SELL MY PERSONAL INFORMATION
    • PRIVACY REQUEST
    • ACCESSIBILITY

Copyright ©2025. All Rights Reserved BNP Media.

Design, CMS, Hosting & Web Development :: ePublishing

search
cart
facebook instagram twitter linkedin youtube
  • Sign In
  • Create Account
  • Sign Out
  • My Account
  • NEWS
  • PRODUCTS
  • CONTRACTORS
    • BATH & KITCHEN PRO
    • BUSINESS MANAGEMENT
    • HIGH EFFICIENCY HOMES
    • TECHNOLOGY
    • WATER TREATMENT
    • PMC COLUMNS
      • Dave Yates: Contractor’s Corner
      • John Siegenthaler: Hydronics Workshop
      • Kenny Chapman: The Blue Collar Coach
      • Matt Michel: Service Plumbing Pros
      • Scott Secor: Heating Perceptions
  • ENGINEERS
    • CONTINUING EDUCATION
    • DECARBONIZATION | ELECTRIFICATION
    • FIRE PROTECTION
    • GEOTHERMAL | SOLAR THERMAL
    • PIPING | PLUMBING | PVF
    • PME COLUMNS
      • Christoph Lohr: Strategic Plumbing Insights
      • David Dexter: Plumbing Talking Points
      • James Dipping: Engineer Viewpoints
      • John Seigenthaler: Renewable Heating Design
      • Lowell Manalo: Plumbing Essentials
      • Misty Guard: Guard on Compliance
  • RADIANT & HYDRONICS
    • RADIANT COMFORT REPORT
    • THE GLITCH & THE FIX
  • INSIGHTS
    • CODES
    • GREEN PLUMBING & MECHANICAL
    • PROJECT PROFILES
    • COLUMNS
      • Codes Corner
      • Natalie Forster: Editorial Opinion
      • Guest Editorial
    • SPONSOR INSIGHTS
  • MEDIA
    • PODCASTS
    • VIDEOS
    • WEBINARS
  • RESOURCES
    • INDUSTRY CALENDAR
    • DIRECTORIES
    • EBOOKS
    • PM BOOKSTORE
    • CE CENTER
    • MARKET RESEARCH
    • CLASSIFIEDS
  • EMAGAZINE
    • EMAGAZINE
    • ARCHIVE ISSUES
    • CONTACT
    • ADVERTISE
    • PME EMAGAZINE ARCHIVES
  • SIGN UP!