Takagi Water Heater Warranty Guide
Manufactured by A.O. Smith Corporation · Warranty info last verified: March 2026
Quick Warranty Facts
Tank / H.E. Coverage
10–15 years
Parts Coverage
5 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 |
|---|---|---|---|
T-KJr2 / T-KJr3 Indoor Tankless 15-year heat exchanger warranty. Residential indoor models. | 15 yr | 5 yr | 1 yr |
T-K4 / T-H3 Outdoor Tankless 15-year heat exchanger warranty. Outdoor installation models. | 15 yr | 5 yr | 1 yr |
T-D2 / Commercial Tankless Commercial-grade tankless units with slightly shorter coverage periods. | 10 yr | 5 yr | 1 yr |
How to Register Your Takagi Water Heater
Product registration is strongly recommended, even if not strictly required. It ensures Takagi has your information on file for warranty service and safety notifications.
You will need:
- Serial number (from the rating label)
- Model number
- Installation date
- Installer's name and contact info
- Your name and address
What's Covered
- Defects in materials and workmanship
- Tank leaks from manufacturing defects (during tank warranty period)
- Internal component failures under normal use
- Heat exchanger failure (for tankless units)
- Manufacturer's defects discovered during warranty period
What's NOT Covered
- Improper installation
- Scale and lime buildup from hard water without treatment
- Lack of annual maintenance
- Commercial use of residential models
How to File a Takagi Warranty Claim
- 1
Register your product at takagi.us.com
- 2
Contact Takagi customer service at 888-882-5244
- 3
Technical support assists with troubleshooting
- 4
Warranty parts are provided through authorized service providers
Takagi warranty line: 888-882-5244
Warranty Transferability: No
Warranty is for the original purchaser and installation address only.
If you recently bought a home with a Takagi water heater, the warranty likely did not transfer to you. Check the age of the unit with our free tool and consider a home warranty plan if the unit is aging.
Additional Notes
Takagi is a Japanese tankless specialist and is a subsidiary of A.O. Smith Corporation. Known for producing high-quality residential and commercial tankless systems. Their 15-year heat exchanger warranty is among the industry's best.
Related brands with similar warranty terms:
Takagi Warranty FAQ
How long is the warranty on a Takagi water heater?
Takagi water heater warranties range from 10 to 15 years for tank coverage, depending on the model series. Parts are typically covered for 5 years and labor for 1 year(s).
Is a Takagi water heater warranty transferable?
No. Takagi warranties are not transferable. Warranty is for the original purchaser and installation address only.
How do I check if my Takagi water heater is still under warranty?
Use our free serial number decoder at WaterHeaterChecker.com to find your manufacture date, then compare the age to Takagi's warranty period for your model. You can also contact Takagi directly at 888-882-5244 with your serial number.
What voids a Takagi water heater warranty?
Common warranty voiding issues for Takagi include: Improper installation; Scale and lime buildup from hard water without treatment; Lack of annual maintenance.
Does Takagi offer an extended warranty?
Takagi does not currently offer a standard extended warranty program. Contact them at 888-882-5244 for current options.
What do I do if my Takagi water heater fails under warranty?
Register your product at takagi.us.com. Then contact takagi customer service at 888-882-5244. Contact Takagi at 888-882-5244 for assistance.
More for Your Takagi Water Heater
Not sure which Takagi model you have?
Check your Takagi water heater's age, model info, and estimated warranty status with our free serial number decoder.
Decode Your Takagi Serial NumberThis information is provided as a helpful reference only. Warranty terms are set by Takagi 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 Takagi or A.O. Smith Corporation.