This measure will develop prescriptive and performance compliance pathway(s) 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 2019 update did not address central water heating and non-regulated end uses such as appliances and plug loads.
The Statewide CASE Team will investigate suitable strategies for achieving all-electric multifamily buildings, including 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:
- Prescriptive packages of measures for all-electric multifamily buildings that meet the respective high-rise and low-rise residential requirements. This effort will involve coordination with the effort to unify multifamily code requirements.
- For the performance pathway, revised multifamily building baselines for heating ventilation and air conditioning (HVAC) systems and, if central HPWH are used, for domestic hot water (DHW) systems. The CASE Team will coordinate with companion efforts on changes related to central HPWH.
- For both prescriptive and performance pathways, two compliance scenarios will be evaluated:
- Create a single all-electric baseline: This scenario proposes that the baseline system fuel type would be electricity regardless of the fuel type of the end uses in the proposed design. The CASE Team would need to demonstrate that the proposed all-electric baseline system would be cost-effective and save as much time dependent valuation (TDV) energy as the existing mixed fuel baseline system.
- Develop an alternate pathway for the proposed all-electric design: Revisions will propose that the baseline system fuel type is the same as the proposed design. The revision will make cost–effectiveness more achievable for all-electric multifamily buildings. The CASE Team will coordinate with the companion effort to update multifamily prototypes. In this option, proposed designs with gas water heaters will retain a gas water heater baseline.
- If needed, establish TDV equivalency, added energy efficiency measures for reduced load. With current TDV value, all-electric multifamily buildings need to include additional energy efficiency measures, compared to mixed-fuel buildings. This analysis will change depending on the metrics that that the Energy Commission develops for 2022 code compliance. Where applicable, federal appliance standards will be assumed. This change would apply to both prescriptive and performance pathways.
- Modified appliances and miscellaneous electric load (MEL) modeling rulesets to account for electric dryers, and stovetop/ranges. This work will involve coordination with the effort to update plug load and appliance assumptions across all multifamily buildings.
Measure proposals, supporting documents, and other outside references will be made public as they become available.
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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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