Heat Pump Water Heaters and Title 24 Compliance
Heat Pump Water Heaters and Title 24
California's 2025 Energy Code strongly favors heat pump water heaters (HPWHs) for new residential construction. Under the updated Title 24 standards, heat pump water heaters are the baseline technology for calculating energy budgets, making them effectively required for most new homes unless designers offset the penalty of using a less efficient system elsewhere.
Why Heat Pump Water Heaters?
Heat pump water heaters use electricity to move heat from the surrounding air into the water tank, making them two to three times more energy efficient than conventional electric resistance or gas water heaters. This efficiency gain is critical for meeting California's aggressive energy and carbon reduction goals.
Title 24 Verification Requirements
When a heat pump water heater is installed, the HERS or ECC rater may need to verify proper installation including correct placement for adequate airflow, proper condensate drainage, appropriate electrical connections, and that the unit matches the specifications listed on the CF1R compliance report. Some installations also require verification of the dedicated 240-volt circuit and proper clearances.
Installation Considerations
Heat pump water heaters need adequate airspace around them to operate efficiently. California's building code requires a minimum room volume or louvered door for enclosed installations. They also produce cool, dehumidified air as a byproduct, which can be beneficial in warm climates but should be considered in cooler regions.