What it costs, what's permitted, and what to ask before you hire.
Last verified: 2026-05-31 · Well-sourced
Panel / electrical
May require a panel upgrade
Permit likelihood
Confirm with your building department
Permit snapshot
plumbing + electrical permit
As of 2026-05-31, heat pump water heater (HPWH) installations in San Francisco typically require a plumbing permit and a separate electrical permit issued by the Department of Building Inspection (DBI). SF DBI generally separates the plumbing and electrical filings — the plumbing permit covers the tank, water connections, condensate drainage, and any gas-line capping when replacing a gas unit, and the electrical permit covers the new 240V dedicated circuit and any panel work. The installation location typically requires adequate free-air space for the heat pump to operate (often a mechanical room with sufficient cubic-foot volume, or a ducted intake/exhaust configuration) — verify the exact room-sizing and ducting requirements with DBI before purchase. If the existing electrical panel cannot accommodate the new 240V circuit, a panel upgrade may be required as a prerequisite (see sf-permit-electrical-panel-upgrade). Verify current plumbing, electrical, drainage, and venting requirements with DBI and the installing contractor before scheduling installation.