Giant Water Heater Manuals
Select your Giant model number below for installation steps, settings, maintenance schedules, troubleshooting and the full specification sheet. Your model number is printed on the rating plate.
Giant water heaters by model number
| Model | Description | Certified |
|---|---|---|
| GHPCO-45 1**+GXST-50T 1 | 45-gallon split-system heat pump water heater | March 2026 |
| GHPCO-45 1**+GXST-50TTTP 1 | 45-gallon split-system heat pump water heater | March 2026 |
| GTHPCO-45 1**+GTXST-50LBTTP 1 | 48-gallon split-system heat pump water heater | March 2026 |
| GTHPCO-45 1**+GTXST-50S 1 | 46-gallon split-system heat pump water heater | March 2026 |
| GTHPCO-45 1**+GTXST-50STTP 1 | 46-gallon split-system heat pump water heater | March 2026 |
| GTHPCO-45 1**+GTXST-50T 1 | 46-gallon split-system heat pump water heater | March 2026 |
| GTHPCO-45 1**+GTXST-50TTTP 1 | 46-gallon split-system heat pump water heater | March 2026 |
| GTHPCO-45 1**+GTXST-66 1 | 60-gallon split-system heat pump water heater | March 2026 |
| GTHPCO-45 1**+GTXST-66TTP 1 | 60-gallon split-system heat pump water heater | March 2026 |
| GTHPCO-45 1**+GTXST-80 1 | 73-gallon split-system heat pump water heater | March 2026 |
| GTHPCO-45 1**+GTXST-80TTP 1 | 73-gallon split-system heat pump water heater | March 2026 |
| UTM-199X3-P 1*1 | 160,000 Btu/h propane tankless water heater | May 2026 |