Giant GTHPCO-45 1**+GTXST-66 1**: $282 a year to run
This model (Water heaters) uses 1,341 kWh of electricity a year, which costs about $282 a year and $2,818 over 10 years at 21.0¢/kWh.
Energy use
1,341 kWh
per year
Running cost per year
$282
21.0¢/kWh
Running cost over 10 years
$2,818
Efficiency rank
602 / 705
Product details
| Type | Hybrid/Electric Heat Pump |
|---|---|
| Heat pump type | Split System HPWH |
| Fuel | Electric |
| Refrigerant | R-744 (CO2) |
| Available since | February 13, 2026 |
Compared with the average model (Water heaters), this one costs about $55 more a year.
More efficient alternatives
| Model | kWh/year | Cost/year |
|---|---|---|
| SANCO2 GS5-45HPC-D HP + ECO-119GLBK | 1,333 | $280 |
| SANCO2 GS5-45HPC HP + ECO-119GLBK | 1,333 | $280 |
| SANCO2 GS5-45HPC-D HP + ECO-83SSAQB | 1,313 | $276 |
| SANCO2 GS5-45HPC HP + ECO-83SSAQB | 1,313 | $276 |
| A. O. Smith HPACO-45 1**+AXST-80 1** | 1,306 | $274 |
| A. O. Smith HPACO-45 1**+AXST-80TTP 1** | 1,306 | $274 |
| A. O. Smith HPACO-45C 1**+AXST-80C 1** | 1,306 | $274 |
| A. O. Smith HPACO-45C 1**+AXST-80CTTP 1** | 1,306 | $274 |
- 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