Progress Continues on RESNET Water Rating Index

waterThe Residential Energy Services Network, or RESNET, is moving forward with development of a national consensus standard for its water efficiency rating index and is seeking volunteers to try it out.

Known as HERSH20, the index will provide water efficiency information for home buyers and home builders. RESNET is partnering with the International Code Council on the standard.

A HERSH2O score is determined by comparing a new home’s water fixtures and infrastructure to a 2006 reference home, similar to the HERS index score for relative energy efficiency. The reference home is scored at 100, and homes that use less water receive a lower score.

HERSH20 is an asset-based rating program, meaning that it predicts water use by the number of bedrooms rather than the number of occupants. The index considers items such as showerheads, faucets, toilet flush volume, washing machines, irrigation, leaks and water waste when calculating predicted efficiency. It also factors in the size of the house and lot, as well as geographic location.

The technical guidelines have been approved for the ANSI accreditation process. The draft water rating index standard, based on the technical guidelines, will be released soon for public review and comment.

RESNET is looking for builders, raters and providers to pilot the HERSH2O beta version. Interested builders should contact RESNET programs director Ryan Meres. RESNET will announce information about training webinars in the near future.

For additional information about NAHB high-performance building initiatives, contact Jaclyn Toole at 800-368-5242 x8225.

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