Menu Toggle Software

Nonresidential Drain Water Heat Recovery

Measure Description

The proposed code change introduces a new compliance option for shower drain water heat recovery (DWHR) in hotels, motels, dormitories, senior living facilities and other nonresidential buildings with shower facilities. Compliance credit can be achieved by installing DWHR devices on shower facilities in nonresidential buildings, provided that the devices have a minimum rated effectiveness of 42 percent and are compliant with either Canadian Standards Association (CSA) B55.1 or the International Association of Plumbing and Mechanical Officials (IAPMO) IGC 346-2017. The proposed change does not impact additions or alterations. The proposed code change also clarifies Section 110.3(c)5 of the standards by including DWHR as a form of recovered energy that can be counted towards the solar and energy recovery requirements for service water heating systems in state buildings.

The proposed code change requires modifications to the NRCC-PLB-01-E compliance document as described in Section 7.4.

The proposed code change requires modifications to the nonresidential compliance software (CBECC-Com) as detailed in Appendix D.

Submeasure Moved to Future Code Cycles

The Statewide CASE Team investigated code change opportunities for nonresidential drain water heat recovery for the 2022 code cycle. This measure was considered because of the potential to achieve savings by applying the 2019 Title 24, Part 6 multifamily drain water heat recovery measure to other nonresidential building types, including lodging.

After initial research, including interviews with stakeholders, the Statewide CASE Team discontinued pursuing proposed changes for the 2022 code change cycle because it was not found to be cost effective on the 15-year timeline required for nonresidential measures.

To support ongoing research and future code cycle consideration, additional information on nonresidential drain water heat recovery can be submitted to the Statewide CASE Team through

Relevant Documents

Provide Feedback

Draft CASE Report Now Available (Comments accepted until June 19, 2020)

This measure description will be updated as research is developed to support the 2022 code cycle. For questions or suggestions, email Include the measure name in the subject line.

Give Us Your Feedback

The Statewide CASE Team values input from all stakeholders engaged in the Title 24, Part 6 code change process. We encourage the open exchange of code change comments and concerns.

  • Use the form above to provide feedback on this measure.