"Heat pump water heater" is not this registry's own record type — it is a model filed as Electric Storage Water Heater whose Uniform Energy Factor clears 2. Sized the same way any storage tank is: First Hour Rating (FHR) must be >= peak hour demand. DOE Energy Saver -- Sizing a New Water Heater (peak hour demand worksheet) publishes gallons per use for six fixtures:
| Use | Gallons |
|---|---|
| One shower | 20 |
| Shaving | 2 |
| Hand dishwashing / food prep | 3 |
| Automatic dishwasher | 7 |
| Clothes washer (top-loader) | 25 |
| Clothes washer (front-loader) | 15 |
What this registry's heat-pump models actually file, by DOE's own box
| Household-demand box | FHR range (DOE) | Heat-pump models on file | Real FHR spread |
|---|---|---|---|
| Very small | 0–18 gal | 0 | -- |
| Low | 18–51 gal | 10 | 41–46 gal |
| Medium | 51–75 gal | 128 | 51–73 gal |
| High | 75–+ gal | 171 | 75–133 gal |
Heat-pump models on file, largest first hour rating first
- Chiltrix Inc. DHW105 : 133 gal FHR — 1,002 kWh/yr
- Reclaim Energy MP120F-RC : 121 gal FHR — 1,323 kWh/yr
- VAUGHN THERMAL MP120F-RC : 121 gal FHR — 1,323 kWh/yr
- VAUGHN THERMAL MP120FHPT : 115 gal FHR — 1,417 kWh/yr
- HUBBELL ME120HPT : 105 gal FHR — 1,468 kWh/yr
- Noritz ME120HPT : 105 gal FHR — 1,468 kWh/yr
- VAUGHN THERMAL ME120HPT : 105 gal FHR — 1,468 kWh/yr
- GE Profile PH80S10BNY01 : 101 gal FHR — 1,102 kWh/yr
- GE Profile PH80S10BPY01 : 101 gal FHR — 1,127 kWh/yr
- GREE GRS-3.0Pd/TD70GANhA-D : 100 gal FHR — 1,231 kWh/yr
- Reclaim Energy MP80F-RC : 98 gal FHR — 1,306 kWh/yr
- VAUGHN THERMAL MP80F-RC : 98 gal FHR — 1,306 kWh/yr
Add up your own household's busiest hour, plus fuel and physical fit, on the water heater selector to narrow this list further.
What it would cost installed in your state
Limits
This box comes from a household's peak-hour demand, not from a room's physical space or ambient temperature — a model in the right box here can still fail those separately (see the closet and room-size questions). Estimating your own household's busiest hour is your own job; DOE's worksheet does not do it for you.