Water heater types on the list
The certified list holds four kinds of water heater, and each is rated by a different measure: tanks by first-hour rating, tankless units by flow at a 67 °F rise, solar systems by solar UEF. In all, the list holds 1,138 model numbers in 187 rating sets.
| Type | Model numbers | Rating sets | Range on the list | Sets by draw pattern |
|---|---|---|---|---|
| Heat pump | 609 | 101 | UEF 2.85–4.50 at the high draw pattern | 58 high, 38 medium, 5 low |
| Gas tankless | 367 | 40 | max flow 3.8–6 gal/min at a 67 °F rise | 39 high, 1 medium |
| Gas storage | 134 | 19 | first-hour rating 86–206 gal | 19 high |
| Solar | 28 | 27 | collector area 22.3–82 sq ft | no draw pattern (rated by SUEF) |
Heat pumps, in five groups
By subtype and by rated volume. A set can appear in one subtype group and one volume group.
- Plug-in 120-volt heat-pump water heaters
Holds 68 model numbers in 12 rating sets
- Split-system heat-pump water heaters
Holds 100 model numbers in 16 rating sets
- Heat-pump water heaters under 50 gallons
Holds 265 model numbers in 36 rating sets
- Heat-pump water heaters, 50 to 69 gallons
Holds 164 model numbers in 30 rating sets
- Heat-pump water heaters, 70 gallons and up
Holds 180 model numbers in 35 rating sets