Creating a Market Value for Water Efficiency in Residential Buildings The RESNET/International Code Council Water Efficiency Rating Index ANSI Standard 2016 International Emerging Technology Symposium Steve Baden, RESNET Mark Johnson, International Code Council
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Creating a Market Value for Water Efficiency in Residential Buildings
The RESNET/International Code Council Water Efficiency Rating Index ANSI Standard
2016 International Emerging Technology Symposium Steve Baden, RESNET
Mark Johnson, International Code Council
Right Time for a Water Efficiency Rating System
“We shall all know the value of water ‐when the well
runs dry.”
Who is the International Code Council
• Nonprofit corporation • 58,000 members, 360 Chapters• A model code and standard developer covering all segments of the building sector
• Staff of more than 250 engineers, architects and administrators
• Currently maintain 15 base codes and 10 Standards
• Updates Codes triennially
International Code Council
A family of 15 coordinated and correlatedcodes
• International Building Code®
• International Fire Code®
• International Mechanical Code®
• International Plumbing Code®
• International Residential Code®
• International Fuel Gas Code®
• International Property Maintenance Code®
• International Private Sewage Disposal Code®
• International Zoning Code®
• International Wildland Urban Interface Code®
• ICC Performance Code for Buildings and Facilities®
• International Swimming Pool & Spa Code
• International Green Construction Code®
• International Energy Conservation Code®
• International Existing Building Code®
• Public Access: codes.iccsafe.org
ICC Codes/Standards and Their Impact on Water Conservation
• International Green Construction Code (IgCC)• International Plumbing Code (IPC) • International Water Efficiency Provisions (WEP) • ICC/ASHRAE 700 National Green Building Standard• ICC Standards
– ASABE/ICC Landscape Irrigation & Sprinkler Emitter Standard
– Rainwater Collection Standard (ICC/CSA)*– RESNET/ICC Water Rating Index*
How Building Codes & Standards Impact Water Efficiency
• While most water efficiency programs are voluntary, codes and standards are mandatory
• Todays codes offer more flexibility for jurisdictions through introducing scalable performance options
• Standards primarily address the product itself, codes address where and when it is installed
• Codes & Standards have the greatest impact on water efficiency through setting the minimum baseline for all building occupancies
• Codes and Standards are only as effective as their enforcement
Why ICC?• Over 100 years codes/standards experience and expertise
• Inclusive process open to all interested parties
• ICC Codes/Standards are widely adopted nationally
• Has global reach• Has the infrastructure in place to support the implementation of codes/standards
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A Balanced Building Regulatory Support System
•Open development process•Input from all interested partiesContinuously kept current•Skilled Technical Committees•Necessary checks and balances
•Plan review•Building inspection•Education and training•Support Publications•Certification and accreditation•Building product evaluation
Building Regulations
Effective Implementation
What Will the WERS Contain?
• A Water Efficiency Rating Index• Definition of a “Reference Home” to which a Rated home’s water efficiency will be compared
• Provisions for the calculation of a home’s water efficiency and Water Efficiency Rating Index Score
• Provisions for the inspection and testing of the water features of a residential building
Application of WERS Standard
• May be applied as a voluntary incentive based standard
• Can be used to set minimum mandatory requirements
• Utilized to set minimum mandatory with added performance based incentives
• Index number can be set according to specific location and conditions
Who is RESNET
• An industry‐based, not for profit organization
• A national standards making body for building energy efficiency rating and certification systems in the USA (ANSI Accredited Standards Development Organization)– Consensus based standard development and amendment process
– Transparent review and adoption process – Formal public review and comment process
What Are Home Energy Ratings
A home energy rating is a whole house analysis of a home’s energy efficiency by a trained and certified RESNET Home Energy Rater. The house data is entered into a RESNET accredited rating software tool which produces the rating
The rating produces a HERS Index Score. The HERS Index is the nationally recognized scoring system for measuring a home’s energy performance.
The HERS Index can be described as a miles‐per‐gallon (MPG) sticker for houses.
The RESNET HERS Index
HERS Ratings Conducted in 2015
HERS Ratings in 2015
Right Time for a Water Rating System
• Dry conditions focus public attention
• Increasing costs of water and wastewater
• Expanding technology for water efficiency
• Existing energy rating system reaching is now reaching national scale
USDA ‐ NOAA
My State ‐ California
201520142013
Value of Water Efficiency is More Than Saving Money
Hydropower Growth Economy
Rising Water & Sewer Rates:Approx. 9% per year
$0.00
$50.00
$100.00
$150.00
$200.00
$250.00
2007 2008 2009 2010 2011 2012 2013(proj.)
2014(proj.)
2015(proj.)
2016(proj.)
2017(proj.)
Rising Water & Sewer Rates(Source: Black & Veatch – Largest 50 metros)
SewerWater
ANSI Adopts RESNET Domestic Hot Water Systems Amendment to the ANSI/RESNET/ICC Standard 301
Game Changer for RESNET
Steps to Develop RESNET WER Index
Domestic Hot Water Systems Calculations
Add a Few More Indoor and Outdoor Water Usage Calculations
Factor in New Technologies
Compare to a Reference Home
Field Verification
RESNET Water Efficiency Rating System
Why RESNET?
• A national non‐profit, multi‐stakeholder organization
• Oversees the Home Energy Rating System (HERS) for scoring the energyefficiency of homes
• HERS recently amended to better score hot water use
• RESNET works with about 5,000 certified HERS raters nationwide
• Operates at scale: 1/3 of new homes received a HERS rating in 2014
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Key Objectives for the WER Index
• Nationwide applicability• Suitable for both new and
existing homes• Encompasses both indoor
and outdoor water efficiency
• Practical and affordable to administer
• Scores usable for quantitative comparison
Key Attributes of the WER Index
• Compares a rated home to a reference home of comparable size
• Reference home has fixed attributes typical of the recent past
• Reference home score = 100• Software assists in tallying
the incremental differences in water consumption resulting from specific features of the home
WER Committee StructureEach balanced with Energy and Water Experts
• WER Index Advisory Council
Open call ≈ 75 members
• WER Index Task Force“technical committee”13 members3 co‐chairs:
o Jacob Atalla, KB Homeo Ed Osann, NRDCo Jonah Schein, EPA
• WER Index Task Force Technical Subcommittees
Modeling & Development of Reference HomeIndoor Water UseOutdoor Water UseRating Inspection & Test ProceduresRater Training & Qualification Requirements
Broad stakeholder participation: Raters, Builders, Suppliers, Trades, Water Utilities, Software Developers, Consultants, Green Building Programs
A Win for All
• Environment• Homeowners• Builders• Raters• Water Districts• Municipalities / Government • Suppliers / Innovators• Green Building Programs