Compact Hot Water Distribution DesignResidential Water Heating
Codes and Standards Enhancement (CASE) Report
The Statewide CASE Team is requesting feedback on the 2019 Title 24, Part 6 Draft CASE Reports. The CASE Report presents pertinent information that supports the code change proposal. Please email feedback to firstname.lastname@example.org. You may also submit written comments to the Energy Commission. See the agenda for Energy Commission pre-rulemaking workshop (available here) for instructions on how to submit comments to the Energy Commission’s docket.
The Compact Hot Water Distribution proposal is intended to provide builders a compliance option credit for designing homes with hot water use fixtures located close to the water heater, saving both energy and water. A compliance option represents a voluntary measure available to builders to help meet or exceed the performance level defined by the standard design. The measure is intended to apply only to new single family homes. As a compliance option, it is a voluntary measure rewarding builders who wish to pursue the credit.
The Compact Hot Water Distribution measure currently exists in 2016 Title 24, Part 6. The 2016 measure involves a Home Energy Rating System (HERS) verification process to demonstrate that the measured length of the hot water supply line from the water heater to the furthest fixture is less than a maximum specified pipe length, which varies with the conditioned floor area of the building. Recent CalCERTS registry data collected over a 16-month period showed that only 0.1 percent of homes used this credit, and feedback from builders indicated the low uptake was due to the credit being not worth the added effort of an extra HERS verification effort. The proposed 2019 update is intended to provide added compliance flexibility to the measure by offering two compact credit options:
- A Basic Credit option that eliminates any HERS verification requirement, and
- An Expanded Credit option offering greater energy credits, but does require limited HERS verification.
Request for Feedback
The Statewide Utility Team encourages participation in the CASE Report development process through the submission of data—both primary sources and references to existing data. We are requesting data on areas such as energy savings, costs, market impacts, industry practices, barriers to code compliance, etc. from stakeholders. The data will inform the energy savings estimates, cost-effectiveness analysis, compliance and enforcement, and market impacts that will be presented in CASE Reports.
Do you have feedback or data to share? Send us an email at email@example.com.
California Statewide Utility Codes and Standards Program
This program is funded by California utility customers and administered by Pacific Gas and Electric Company, Southern California Edison, San Diego Gas and Electric Company, Southern California Gas Company, Sacramento Municipal District, and Los Angeles Department of Water and Power in preparation for the California Energy Commission’s Codes and Standards Buildings Advocacy.