State Water Heater Warranty Guide
Manufactured by A.O. Smith Corporation · Warranty info last verified: March 2026
State water heaters are manufactured by A.O. Smith Corporation. This guide covers 4 product lines: the ProLine, ProLine XE, ProLine Master, and Vertex Power Direct Vent. Across those lines, tank or heat exchanger coverage climbs from 6 years on the ProLine to 10 years on the ProLine Master, parts reach 10 years, and labor runs up to 1 year. The warranty stays with the original owner and does not transfer to later owners, and claims run through 800-365-0024.
Quick Warranty Facts
Tank / H.E. Coverage
6–10 years
Parts Coverage
10 years max
Labor Coverage
1 year
Transferable
No
Extended Warranty
N/A
Registration Required
Recommended
Warranty by Product Line
Coverage periods vary by model series. Check your model against the table below.
| Product Line | Tank / H.E. | Parts | Labor |
|---|---|---|---|
ProLine Standard residential line. | 6 yr | 6 yr | 1 yr |
ProLine XE High-efficiency mid-tier line. | 9 yr | 9 yr | 1 yr |
ProLine Master Premium residential line with longer coverage. | 10 yr | 10 yr | 1 yr |
Vertex Power Direct Vent High-efficiency direct vent model with up to 96% thermal efficiency. | 10 yr | 10 yr | 1 yr |
How to Register Your State Water Heater
There is no strict registration deadline listed for State, yet filing it is smart insurance for the 4 lines shown here. Registration puts your purchase date and installer on record so a later claim through 800-365-0024 moves faster.
You will need:
- Serial number (from the rating label)
- Model number
- Installation date
- Installer's name and contact info
- Your name and address
Keep a copy with your State paperwork in case you later call 800-365-0024.
What's Covered
- Defects in materials and workmanship under normal residential use
- ProLine: 6-year tank coverage, 6-year parts, and 1-year labor
- ProLine XE: 9-year tank coverage, 9-year parts, and 1-year labor
- ProLine Master: 10-year tank coverage, 10-year parts, and 1-year labor
- Vertex Power Direct Vent: 10-year tank coverage, 10-year parts, and 1-year labor
What's NOT Covered
State lists 5 situations that fall outside coverage on its 4 lines:
- Improper installation
- Scale and sediment damage
- Commercial use of residential units
- Labor after year one
- Unauthorized modifications
How to File a State Warranty Claim
- 1
Register your product at statewaterheaters.com
- 2
Locate serial and model numbers on the rating label
- 3
Call State customer service at 800-365-0024
- 4
A State-authorized service provider will diagnose and repair
- 5
Warranty parts are provided at no charge during warranty period
State warranty line: 800-365-0024
Warranty Transferability: No
Warranty applies only to the original purchaser at the original installation address.
Bought a home that came with a State unit? Because State coverage stays with the first owner, the remaining warranty probably did not follow the sale to you, even if the calendar time has not expired. To confirm, decode the serial with our free tool for the manufacture date, then call the State line at 800-365-0024 (labor help is limited to 1 year from install).
Additional Notes
State Water Heaters is a subsidiary of A.O. Smith Corporation and shares manufacturing facilities. State products are sold through professional plumbing contractors and wholesale distributors. Products carry State-specific branding but are engineered to A.O. Smith standards.
Related brands with similar warranty terms:
State Warranty FAQ
How many years does the State tank warranty last?
State tank or heat exchanger coverage ranges from 6 to 10 years, from the ProLine up to the ProLine Master. Parts are covered for up to 10 years and labor for up to 1 year.
Can I transfer a State water heater warranty to a new owner?
No. State warranties are not transferable. Warranty applies only to the original purchaser at the original installation address.
How do I check whether my State water heater is still under warranty?
Decode your serial number with our free tool at WaterHeaterChecker.com to find the manufacture date, then compare it against the coverage for your line (ProLine, ProLine XE, ProLine Master, and Vertex Power Direct Vent). You can also call State at 800-365-0024 with your serial number.
What voids a State water heater warranty?
Common warranty voiding issues for State include: Improper installation; Scale and sediment damage; Commercial use of residential units.
Does State sell an extended warranty for the ProLine, ProLine XE, ProLine Master, and Vertex Power Direct Vent?
The ProLine, ProLine XE, ProLine Master, and Vertex Power Direct Vent carry only the standard State factory warranty shown above; no separate extended plan is listed. Ask about dealer coverage when you call 800-365-0024.
What should I do if my State water heater fails under warranty?
Register your product at statewaterheaters.com. Then locate serial and model numbers on the rating label. The State warranty line is 800-365-0024.
More for Your State Water Heater
Not sure which of State's 4 lines you have?
Coverage differs across State's lines, so decode your serial number to find the manufacture date and match it to the right 4-line warranty range above.
Decode Your State Serial NumberThe 4 coverage figures shown above were last verified in March 2026 and are provided as a helpful reference only. Warranty terms are set by State and may change at any time. Always refer to the warranty certificate that came with your water heater for the definitive terms of your coverage. WaterHeaterChecker.com is not affiliated with State or A.O. Smith Corporation.