Carnot Labs, Inc. N51: $295 a year to run
This model (Water heaters) uses 1,404 kWh of electricity a year, which costs about $295 a year and $2,951 over 10 years at 21.0¢/kWh.
Energy use
1,404 kWh
per year
Running cost per year
$295
21.0¢/kWh
Running cost over 10 years
$2,951
Efficiency rank
673 / 705
Product details
| Type | Hybrid/Electric Heat Pump |
|---|---|
| Heat pump type | 240 Volt Integrated HPWH |
| Fuel | Electric |
| Refrigerant | R-513A |
| Available since | February 10, 2026 |
Compared with the average model (Water heaters), this one costs about $68 more a year.
More efficient alternatives
| Model | kWh/year | Cost/year |
|---|---|---|
| Friedrich PROH80 T0 FD120-M | 1,403 | $295 |
| Friedrich PROH80 T0 FD120-MSO | 1,403 | $295 |
| Rheem PROPH80 T0 RH120-M | 1,403 | $295 |
| Rheem PROPH80 T0 RH120-MSO | 1,403 | $295 |
| Rheem XE80T10HM00U0 | 1,403 | $295 |
| Rheem XE80T10HMS00U0 | 1,403 | $295 |
| Richmond 10E80-HP120M | 1,403 | $295 |
| Richmond 10E80-HP120MS | 1,403 | $295 |
- Refrigerators
- Freezers
- Washing machines
- Dishwashers
- Tumble dryers
- Room air conditioners
- Dehumidifiers
- Electric cooktops and ranges
- Televisions
- Computers
- Air purifiers
Source: ENERGY STAR (U.S. EPA) · 21.0¢/kWh (August 2026) · Methodology