Drain Water Heat RecoveryResidential 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 email@example.com. 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 drain water heat recovery (DWHR) measure is completely new in the California Building Energy Efficiency Standards, and saves water heating energy expended during showering. This measure applies to new construction of low-rise residential buildings. DWHR is likely cost-effective in some high-rise residential and some nonresidential applications (e.g. hotel laundry rooms), but only the new construction low-rise residential section of the standards will be modified. In addition, only savings from showering will be modeled in the residential energy software. DWHR comes in horizontal and vertical configurations, but only vertical units are included in this measure, because there is currently no performance testing standard for horizontal units. IAMPO and a horizontal manufacturer are currently working on such a standard, which the manufacturer expects to be completed in July 2017 and titled IAPMO IGC-346.
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 firstname.lastname@example.org.
- Presentation from Stakeholder Meeting on October 26, 2016
- Notes from Stakeholder Meeting on October 26, 2016
- Presentation from Stakeholder Meeting on March 23, 2017
- Draft Code Language, March 2017
- Development of a Title 24 Compliance Model for Residential Drain Water Heat Recovery Devices
- Results of Vertical Drain Water Heat Recovery Phase Two Lab Testing and Data Analysis
- Notes from Stakeholder Meeting on March 23, 2017
- IAPMO has posted a draft horizontal DWHR test procedure that is open for public comment until July 3, 2017
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.