This CASE Report will develop a prescriptive pathway and compliance option for all-electric multifamily buildings that use electric appliances for all regulated and non-regulated end uses. This topic builds on the 2019 prescriptive requirements for low-rise residential buildings that allow heat pump water heating (individual water heaters) and space heating. The update in the 2019 code cycle did not address non-regulated end uses such as appliances and plug loads. This study will additionally develop a compliance option for electric space and water heating including central water heating systems, appliances, and plug loads for multifamily buildings.
The Statewide CASE Team will investigate suitable strategies for achieving all-electric Zero Net Energy (ZNE), including high performance heat pump space heating and cooling, heat pump water heaters (HPWH), heat pump dryers, electric ranges, combined hydronic space and domestic water heating, induction cooking and any additional energy efficiency measures necessary. Developing an all-electric pathway may involve one or more of the following changes.
- Develop prescriptive packages of measures for all-electric multifamily buildings that meet the respective high-rise and low-rise residential requirements.
- Revisions to baseline heating ventilation and air conditioning (HVAC) systems for multifamily buildings and baseline domestic hot water (DHW) system if central heat pump water heating systems are used.
- Add energy efficiency measures for reduced load if needed.
- Adjustment to EDR methods to make cost-effectiveness more achievable for all-electric low-rise multifamily buildings.
- Modify appliances and miscellaneous electric load (MEL) modeling rulesets to account for electric dryers, and stovetop/ranges.
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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.
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