Integrated HPWH
This is a standalone unit where the heat pump and water tank are combined into a single unit.
- ≥ 3.30 UEF (Uniform Energy Factor) = very efficient
- Exception: If the unit is designed for a 120 volt / 15 amp circuit (usually plug-in units for homes without 240V wiring), it only needs to be ≥ 2.20 UEF
Split-System HPWH
These systems have separate indoor and outdoor components (like split heat pumps for space heating).
- Must be ≥ 2.20 UEF to qualify

