A. O. Smith Water Heater Manuals — page 3
Select your A. O. Smith model number below for installation steps, settings, maintenance schedules, troubleshooting and the full specification sheet. Your model number is printed on the rating plate.
A. O. Smith water heaters by model number
| Model | Description | Certified |
|---|---|---|
| HPACO-45 1**+AXST-50LBTTP 1 | 48-gallon split-system heat pump water heater | February 2026 |
| HPACO-45 1**+AXST-50S 1 | 46-gallon split-system heat pump water heater | February 2026 |
| HPACO-45 1**+AXST-50STTP 1 | 46-gallon split-system heat pump water heater | February 2026 |
| HPACO-45 1**+AXST-50T 1 | 45-gallon split-system heat pump water heater | February 2026 |
| HPACO-45 1**+AXST-50TTTP 1 | 45-gallon split-system heat pump water heater | February 2026 |
| HPACO-45 1**+AXST-66 1 | 60-gallon split-system heat pump water heater | February 2026 |
| HPACO-45 1**+AXST-66TTP 1 | 60-gallon split-system heat pump water heater | February 2026 |
| HPACO-45 1**+AXST-80 1 | 73-gallon split-system heat pump water heater | March 2026 |
| HPACO-45 1**+AXST-80TTP 1 | 73-gallon split-system heat pump water heater | February 2026 |
| HPACO-45C 1**+AXST-50LBCTTP 1 | 48-gallon split-system heat pump water heater | March 2026 |
| HPACO-45C 1**+AXST-50SC 1 | 46-gallon split-system heat pump water heater | March 2026 |
| HPACO-45C 1**+AXST-50SCTTP 1 | 46-gallon split-system heat pump water heater | March 2026 |
| HPACO-45C 1**+AXST-50TC 1 | 45-gallon split-system heat pump water heater | March 2026 |
| HPACO-45C 1**+AXST-50TCTTP 1 | 45-gallon split-system heat pump water heater | March 2026 |
| HPACO-45C 1**+AXST-66C 1 | 60-gallon split-system heat pump water heater | March 2026 |
| HPACO-45C 1**+AXST-66CTTP 1 | 60-gallon split-system heat pump water heater | March 2026 |
| HPACO-45C 1**+AXST-80C 1 | 73-gallon split-system heat pump water heater | March 2026 |
| HPACO-45C 1**+AXST-80CTTP 1 | 73-gallon split-system heat pump water heater | March 2026 |
| HPCT-40L 1GPCT-40L 1** | 38-gallon gas storage water heater | November 2024 |
| HPCX-50L 1GPCX-50L 1** | 49-gallon gas storage water heater | November 2024 |
| HPS10-50H45DV 2 | 46-gallon heat pump water heater | December 2025 |
| HPS10-66H45DV 2 | 67-gallon heat pump water heater | December 2025 |
| HPS10-80H45DV 2 | 82-gallon heat pump water heater | December 2025 |
| HPSN10-50H45DV 2 | 46-gallon heat pump water heater | December 2025 |
| HPSN10-66H45DV 2 | 67-gallon heat pump water heater | December 2025 |
| HPSN10-80H45DV 2 | 82-gallon heat pump water heater | December 2025 |
| HPTA-40 2 | 36-gallon heat pump water heater | December 2025 |
| HPTA-50 2 | 46-gallon heat pump water heater | December 2025 |
| HPTA-66 2 | 68-gallon heat pump water heater | December 2025 |
| HPTA-80 2 | 81-gallon heat pump water heater | December 2025 |
| HPTS-50 2 | 46-gallon heat pump water heater | December 2025 |
| HPTS-66 2 | 67-gallon heat pump water heater | December 2025 |
| HPTS-80 2 | 82-gallon heat pump water heater | December 2025 |
| HPTU-50CTA 1 | 46-gallon heat pump water heater | February 2023 |
| HPTU-50DR 1 | 46-gallon heat pump water heater | February 2023 |
| HPTU-50N 1 | 46-gallon heat pump water heater | February 2023 |
| HPTU-66CTA 1 | 67-gallon heat pump water heater | February 2023 |
| HPTU-66DR 1 | 67-gallon heat pump water heater | February 2023 |
| HPTU-66N 1 | 67-gallon heat pump water heater | February 2023 |
| HPTU-80CTA 1 | 82-gallon heat pump water heater | February 2023 |
| HPTU-80DR 1 | 82-gallon heat pump water heater | February 2023 |
| HPTU-80N 1 | 82-gallon heat pump water heater | February 2023 |
| HPTV-50 2 | 46-gallon 120-volt heat pump water heater | December 2025 |
| HPTV-66 2 | 68-gallon 120-volt heat pump water heater | December 2025 |
| HPTV-80 2 | 82-gallon 120-volt heat pump water heater | December 2025 |
| HPV10-50H01DV 2 | 46-gallon 120-volt heat pump water heater | December 2025 |
| HPV10-66H01DV 2 | 68-gallon 120-volt heat pump water heater | December 2025 |
| HPV10-80H01DV 2 | 82-gallon 120-volt heat pump water heater | December 2025 |