QR Code Product Support at your Fingertips!
Get fast, easy access to product information, including a spec sheet for your unit, and solve problems without having to call technical support.
How The QR Code Works
1. Find The Rating Plate
Find the rating plate located on the A. O. Smith Water Heater. The QR Code will be located on the rating plate.
2. Scan The QR Code
Open your camera app on iOS or Android mobile and scan the QR Code on the rating plate by pointing your camera at it. Tap the link when it appears.
3. View Support Info
Displayed is the Model Number, Serial Number, Warranty Status, and links to the User Manual, Registration, Troubleshooting, Technical Support, and Find A Contractor.
Old Wiring Diagrams
Commercial and Residential Wiring Diagrams
Commercial Wiring Diagrams
| Description | Series | Wiring Diagram |
| XP Boiler | XB/XW 1000 - 1700 | 321302 |
| XP Boiler | XB/XW 2000 - 3400 | 321303 |
| One Heater/Boiler, One Pump, Cert-Temp 80 with or w/o IID System | HW-120M - HW-670 | A055.0 |
| One Heater/Boiler, One Pump, Cert-Temp 80 with or w/o IID System | HW-200M - HW-670 | A057.0 |
| Two Heaters/Boilers, Two Pumps, Cer-Temp | HW-300 - HW-670 | A059.0 |
| Wiring Diagram | HW-120M - HW-670 Booster Recovery/Shure Temp | AOSDG65100 |
| Wiring Diagram | LB/LW-500-1000 | A063.0 |
| Dura-Max Wiring Diagram | DW-720 - DW-1810 | AOSDG65101 |
| Multiple Dura-Max Wiring Diagram | DW-720 - DW-1810 | AOSDG65102 |
| Legend Wiring Diagram Low Water Cutoff & Alarm | LB/LW 500-1000 | A064.1 |
| Two - with or without Mixing Valve/Two Pre-Heaters w/Boosters | COF | A309.0 |
| Conventional System Piping | HW-300 - HW-670 | E107.0 |
| 1 & 2 Boiler, Reverse Return | DB-720 - 1810 | E109.0 |
| Three Boilers Reverse Return | DB-720 - DB-1810 | E109.2 |
| 1 & 2 Boiler, Reverse Return | LB-500, 750 & 1000 | E110.0 |
| Three Boilers Reverse Return | LB-500, LB-750, LB-1000 | E110.2 |
| Piping Method for Low Temperature Heating Systems | LB 500, 750, 1000 | E112.0 |
| Low Temperature System | DB-710 - 1810 | E112.2 |
| Low Temperature System | LB-500, 750, 1000 | E112.3 |
| Genesis Primary, Secondary Piping | GB-200-750 | E112.4 |
| Linear-Temp™ System | DB-720 - DB-1810 | E115.0 |
| Linear Temp™ Primary, Secondary Piping | GB-200-750 | E115.5 |
| Linear-Temp™ System | LB-500, LB-750, LB-1000 | E116.0 |
| Linear-Temp | HW 300 - 670 | E117.0 |
| One Heater with or without IID System | HW-300 - HW-670 | E121.0 |
| Four Heaters with or without IID System | HW-300 - HW-670 | E124.1 |
| Typical Wiring - Multiple Thermal Balancer Pump Delay Switches | E125.0 | |
| TJERNLUNCH Draft Inducers | AOSCG66000 | |
| XP Boiler Wiring Diagram | XB XWH 1000-1700 | 324888 |
| XP Boiler Wiring Diagram | XB XWH 2000-3400 | 324889 |
Residential Wiring Diagrams
| Description | Series | Wiring Diagram |
| Wiring Diagrams for Residential Water Heaters | 315267-000 | |
| Multiple Heater Piping for All Top Connecting Models | 315268-000 |
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