A. O. Smith Water Heater Manuals — page 2
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 |
|---|---|---|
| GDHE-50 3 | 49-gallon residential-duty commercial gas water heater | February 2023 |
| GDHE-75 3 | 74-gallon residential-duty commercial gas water heater | February 2023 |
| GPCC-40L 1 | 38-gallon gas storage water heater | March 2026 |
| GPCC-50X 1 | 49-gallon gas storage water heater | August 2026 |
| GPCT-40L 1 | 38-gallon gas storage water heater | February 2026 |
| GPCX-50L 1 | 49-gallon gas storage water heater | February 2026 |
| GPHE-50 1 | 48-gallon residential-duty commercial natural gas water heater | February 2023 |
| GSP-100 2SWN100035 2** | 33-gallon residential-duty commercial gas water heater | February 2023 |
| GT15-240-NO 1T-H3J-OS-N | 160,000 Btu/h natural gas tankless water heater | February 2023 |
| GT15-240-PO 1*1T-H3J-OS-N | 160,000 Btu/h propane tankless water heater | February 2023 |
| GT15-340-NI 1T-H3S-DV-N | 180,000 Btu/h natural gas tankless water heater | February 2023 |
| GT15-340-PI 1*1T-H3S-DV-N | 180,000 Btu/h propane tankless water heater | February 2023 |
| GT15-540-NO 1T-H3-OS-N 1** | 199,000 Btu/h natural gas tankless water heater | February 2023 |
| GT15THR-160M 1ATHR-160M 1** | 160,000 Btu/h gas tankless water heater | December 2023 |
| GT15THR-160X3 1ATHR-160M 1** | 160,000 Btu/h gas tankless water heater | December 2023 |
| GT15THR-180M 1ATHR-180M 1** | 180,000 Btu/h gas tankless water heater | December 2023 |
| GT15THR-180X3 1ATHR-180M 1** | 180,000 Btu/h gas tankless water heater | December 2023 |
| GT15THR-199M 1ATHR-199M 1** | 199,000 Btu/h gas tankless water heater | December 2023 |
| GT15THR-199X3 1ATHR-199M 1** | 199,000 Btu/h gas tankless water heater | December 2023 |
| GT15TM-140M-N 1ATM-140M-N 1** | 140,000 Btu/h natural gas tankless water heater | July 2026 |
| GT15TM-160M-NATM-160M-N 1** | 160,000 Btu/h natural gas tankless water heater | April 2025 |
| GT15TM-160M-N 1 | 160,000 Btu/h natural gas tankless water heater | July 2026 |
| GT15TM-160M-P 1*1 | 160,000 Btu/h propane tankless water heater | July 2026 |
| GT15TM-160X3-NATM-160M-N 1** | 160,000 Btu/h natural gas tankless water heater | April 2025 |
| GT15TM-160X3-N 1 | 160,000 Btu/h natural gas tankless water heater | July 2026 |
| GT15TM-160X3-P 1*1 | 160,000 Btu/h propane tankless water heater | July 2026 |
| GT15TM-180M-NATM-180M-N 1** | 180,000 Btu/h natural gas tankless water heater | April 2025 |
| GT15TM-180M-N 1 | 180,000 Btu/h natural gas tankless water heater | May 2026 |
| GT15TM-180M-P 1*1 | 160,000 Btu/h propane tankless water heater | May 2026 |
| GT15TM-180X3-NATM-180M-N 1** | 180,000 Btu/h natural gas tankless water heater | April 2025 |
| GT15TM-180X3-N 1 | 180,000 Btu/h natural gas tankless water heater | May 2026 |
| GT15TM-199M-NATM-199M-N 1** | 199,000 Btu/h natural gas tankless water heater | April 2025 |
| GT15TM-199M-N 1 | 199,000 Btu/h natural gas tankless water heater | May 2026 |
| GT15TM-199M-P 1*1 | 160,000 Btu/h propane tankless water heater | May 2026 |
| GT15TM-199X3-NATM-199M-N 1** | 199,000 Btu/h natural gas tankless water heater | April 2025 |
| GT15TM-199X3-N 1 | 199,000 Btu/h natural gas tankless water heater | May 2026 |
| GT15TM-199X3-P 1*1 | 160,000 Btu/h propane tankless water heater | May 2026 |
| HCCC-50T 1 | 49-gallon gas storage water heater | May 2026 |
| HDHE-50 4 | 49-gallon residential-duty commercial gas water heater | December 2025 |
| HDHE-75 4 | 74-gallon residential-duty commercial gas water heater | December 2025 |
| HP1050H45DV 1 | 46-gallon heat pump water heater | February 2023 |
| HP1050H45DVCTA-1 | 46-gallon heat pump water heater | February 2023 |
| HP1080H45DV 1 | 82-gallon heat pump water heater | February 2023 |
| HP1080H45DVCTA-1 | 82-gallon heat pump water heater | February 2023 |
| HPA10-40H45DV 2 | 36-gallon heat pump water heater | December 2025 |
| HPA10-50H45DV 2 | 46-gallon heat pump water heater | December 2025 |
| HPA10-66H45DV 2 | 68-gallon heat pump water heater | December 2025 |
| HPA10-80H45DV 2 | 81-gallon heat pump water heater | December 2025 |