State is AO Smith\'s subsidiary brand. Same factories, same engineering, same internal hardware as AO Smith Signature. The difference is positioning:
| State ProLine | AO Smith Signature Select | AO Smith Signature Premier | |
|---|---|---|---|
| Tank warranty | 6 years | 9 years | 12 years |
| Tank construction | Same | Same | Same (heavier anode) |
| Cabinet/trim | Value-tier badging | Standard | Premium trim |
| Typical price (50-gal gas) | $749-949 | $849-1,049 | $949-1,249 |
| Sold at | Lowe\'s primarily | Lowe\'s + plumbing wholesale | Lowe\'s + plumbing wholesale |
Premier Hybrid vs Voltex — same warranty
Important exception: State Premier Hybrid and AO Smith Voltex have IDENTICAL 10-year tank warranties. For heat pump shoppers, choosing State saves $200-400 with no warranty penalty.
When State wins
- Heat pump shopper (Premier Hybrid = no warranty penalty)
- Value-priority tank buyer who doesn\'t need longer warranty
- Lowe\'s shopper
When AO Smith Signature wins
- Tank warranty-priority buyer (Premier 12-year vs State ProLine 6-year)
- Long-term ownership (warranty length matters over 12-15 year life)
- Plumber-channel buyer (Signature has broader plumber distribution than State)
Same parts compatibility
Most parts interchange. Same anode rods, similar elements, same dip tubes. Exception: gas valves and ignition modules are model-specific (check part number before ordering).
Bottom line
State for value tank pricing; AO Smith Signature for longer warranty. For Premier Hybrid heat pump, State is the obvious choice — same product, lower price, same warranty.