Heat pump water heaters save energy by using ambient heat to raise the temperature of water, rather than relying solely on electric resistance heat such as with a conventional electric storage water heater.
This measure's workbook contains a large suite of applications for installing HPWHs in single family or manufacture homes. This measure includes 317 different measure applications, including distinctions related to:
- Efficiency tiers based on NEEA's Advanced Water Heating Specification
- Existing homes vs new homes
- Installation location in home (ex: garage, conditioned indoor space)
In February 2021, the RTF removed the "any vintage/any location" measure identifiers. Rather than the RTF developing regional averages for assumed installation location (building vintage, etc), the RTF encourages programs to use this measure suite to create estimates that best reflect their market and program design, whether taking a midstream or downstream approach.
The majority of the measure is considered Proven. The measure applications for Tier 4, No Resistance, Split-System HPWHs remain Planning, and there is an associated research strategy below.