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