AO Smith maintains user, install, and service manuals for residential water heaters going back 20+ years on their website. This page is the manuals directory.
How to find your AO Smith manual
- Locate your exact model number on the data plate (see our age lookup page for typical sticker locations)
- Visit hotwater.com → Resources → Owner's Manuals (or search the model number directly)
- Download the PDF for your manual type
Manual types
- Use & Care Manual — homeowner-facing. Temperature settings, troubleshooting, maintenance procedures, warranty registration.
- Installation Manual — installer-facing. Gas line sizing, venting requirements, electrical specs, clearance, code compliance.
- Parts Diagram / Service Manual — service-tech-facing. Exploded view with AO Smith part numbers.
- iCOMM User Guide — for WiFi-equipped Voltex hybrid and Signature Premier with smart control.
Most-requested AO Smith manuals
| Model family | Quick lookup |
|---|---|
| Signature Premier (GCV-40-300, GCV-50-300, GCV-75-300) | hotwater.com → search "GCV-50-300" |
| ProMax (GCV-40, GCV-50, ECV-75, ECT-100) | search "GCV-50" / "ECV-75" |
| ProLine Master (GPVL-75, GPDH-50) | search "GPVL-75" / "GPDH-50" |
| ProLine power vent (GPV-50, GPVH-50) | search "GPV-50" / "GPVH-50" |
| Signature 100 electric (EJC-40, EJC-50, EJC-80) | search "EJC-50" |
| Voltex hybrid (HPTU-50N, HPTU-80N) | search "HPTU-50N" |
| Vertex Power Direct Vent (GPDX-50, GPDX-75) | search "GPDX-50" |
| ProLine Tankless (ATI-540H-N, ATI-110U) | search "ATI-540H-N" |
| Cyclone Xi commercial (BTH-150, BTH-199, BTH-300) | search "BTH-199" — commercial section |
| Conservationist (legacy: GCR, ENT, ENS) | search "GCR-40" — archive section |
What if the data plate is unreadable?
Look for secondary plates inside the burner access door (gas) or upper element access (electric). Call AO Smith customer service at 1-800-527-1953 with the serial number alone — they can often cross-reference to model.
Bottom line
hotwater.com / Resources / Manuals has manuals for nearly every AO Smith water heater going back 20+ years. For installation help see our install guide; for troubleshooting see our troubleshooting hub.