Giant Split System Heat Pump 80-Gallon (GTHPCO-45 1-+GTXST-80TTP 1)
Giant Split System Heat Pump 80-Gallon (GTHPCO-45 1-+GTXST-80TTP 1) is a heat pump (hybrid electric) water heater from Giant with a 73 gallon rated tank and a 95 gallon first-hour rating at a 3.8 UEF.
| Uniform Energy Factor (UEF) | 3.8 |
|---|---|
| Annual electricity use | 1306 kWh/yr |
| Recovery efficiency | 423 % |
| Fuel | Electric |
|---|
| First-hour rating | 95 gal |
|---|---|
| Rated storage volume | 73 gal |
| Draw pattern | High |
| Heat pump type | Split System HPWH |
|---|---|
| Refrigerant (GWP) | R-744 (CO₂) (GWP:1 | Lower GWP) |
| Compressor low-temp cutoff | 1 °F |
| Input voltage | 240 |
|---|---|
| Max current draw | 20.2 A |
| Smart / connected capable | Yes |
|---|
| Height | 58 in |
|---|---|
| Diameter | 20 in |
| ENERGY STAR certified | Yes |
|---|
Who is the Giant Split System Heat Pump 80-Gallon (GTHPCO-45 1-+GTXST-80TTP 1) for?
- Its 95 gallon first-hour rating suits a household of 5+ people under DOE sizing guidance.
- Estimated running cost: about $222/year at the national average electricity rate (1306 kWh/yr certified use).
- Needs a 240 V circuit; at 20.2 A max draw plan for a 30 A breaker (NEC 125% continuous-load rule).
- The heat pump compressor operates down to 1 °F ambient — below that, backup elements take over.
Similar water heaters
- A. O. Smith Heat Pump 80-Gallon (HPA10-80H45DV 2) (UEF 3.88)
- A. O. Smith Heat Pump 80-Gallon (HPS10-80H45DV 2) (UEF 3.88)
- A. O. Smith Heat Pump 80-Gallon (HPSN10-80H45DV 2) (UEF 3.88)
- A. O. Smith Heat Pump 80-Gallon (HPTA-80 2) (UEF 3.88)
- A. O. Smith Heat Pump 80-Gallon (HPTS-80 2) (UEF 3.88)
- A. O. Smith Split System Heat Pump 80-Gallon (HPACO-45 1-+AXST-80 1) (UEF 3.8)
Frequently asked questions
Is the Giant Split System Heat Pump 80-Gallon (GTHPCO-45 1-+GTXST-80TTP 1) ENERGY STAR certified?
Yes, the Giant Split System Heat Pump 80-Gallon (GTHPCO-45 1-+GTXST-80TTP 1) holds a current ENERGY STAR certification for water heating efficiency (UEF 3.8).
How much does the Giant Split System Heat Pump 80-Gallon (GTHPCO-45 1-+GTXST-80TTP 1) cost to run per year?
About $222 per year at national average energy rates, based on its certified annual energy use under the DOE test draw pattern. Your rate and usage change this figure.
What electrical circuit does the Giant Split System Heat Pump 80-Gallon (GTHPCO-45 1-+GTXST-80TTP 1) need?
The Giant Split System Heat Pump 80-Gallon (GTHPCO-45 1-+GTXST-80TTP 1) runs on a 240 V circuit drawing up to 20.2 A; per the NEC 125% continuous-load rule plan for at least a 30 A breaker (check the installation manual for the required circuit).
Is the Giant Split System Heat Pump 80-Gallon (GTHPCO-45 1-+GTXST-80TTP 1) a smart water heater?
Yes, the Giant Split System Heat Pump 80-Gallon (GTHPCO-45 1-+GTXST-80TTP 1) is connected-capable, with app control and eligibility for most utility demand-response programs.
Sources
- data.energystar.gov (retrieved 2026-07-17)