PART I - Crossover Diagnosis and Repair
- Owner Identification & Repair Strategies
- Common Causes of Domestic Hot Water Delivery Complaints
Sample Guidance: Building-Wide Investigation & Repair Strategies
PART II - Crossover Investigation and Testing
- Case Studies & Benchmarking
Sample Methodology: Temperature Logger Data Pre- & Post- Crossover Repair
Crossover is prevalent among multifamily properties with central Domestic Hot Water (DHW) systems with recirculation of all ages and sizes. Retrofits conducted without addressing crossover issues can lead to increased post-installation costs and a potential reversion back to gas appliances. In order to avoid these outcomes, state energy efficiency and decarbonization policies and programs (needed to meet California's greenhouse gas reduction goals) that include existing multifamily affordable housing must ensure that:
- Funding and technical assistance be made available to rent-restricted properties serving low-income households to remedy the operating and GHG impacts of crossover.
- Contractors and property maintenance staff can access training in identification and mitigation strategies.