The expert meeting, “Exploring the Disconnect Between Rated and Field Performance of Water Heating Distribution Systems” was conducted by Building America team, Alliance for Residential Building Innovation (ARBI), on September 28, 2012, at NREL’s Research Support Facility in Golden, Colorado.

Water heating represents a major residential energy end use, especially in highly efficient homes where space conditioning loads and energy use has been significantly reduced. Future efforts to reduce water heating energy use requires the development of an improved understanding of equipment performance, as well as recognizing system interactions related to the distribution system and the fixture use characteristics. By bringing together a group of water heating experts, the team aimed to advance the shared knowledge on key water heating performance issues and identify additional data needs that will further this critical research area.

The attached summary report outlines presentations and results from the meeting.