Noritz Water Heater Warranty Guide
Manufactured by Noritz America Corporation · Warranty info last verified: March 2026
Noritz water heaters are covered by Noritz America Corporation. This guide covers 2 product lines: the EZ Series Tankless and CB Combi-Boiler. Across those lines, tank or heat exchanger coverage climbs from 12 years on the CB Combi-Boiler to 25 years on the EZ Series Tankless, parts reach 5 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 866-766-7489.
Quick Warranty Facts
Tank / H.E. Coverage
12–25 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 |
|---|---|---|---|
EZ Series Tankless Condensing direct tank-replacement line with top-mounted connections. Noritz covers the heat exchanger for 25 years, the longest residential tankless term on the market. | 25 yr | 5 yr | 1 yr |
CB Combi-Boiler Combination space heating and hot water unit. | 12 yr | 5 yr | 1 yr |
How to Register Your Noritz Water Heater
There is no strict registration deadline listed for Noritz, yet filing it is smart insurance for the 2 lines shown here. Registration puts your purchase date and installer on record so a later claim through 866-766-7489 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 Noritz paperwork in case you later call 866-766-7489.
What's Covered
- Defects in materials and workmanship under normal residential use
- EZ Series Tankless: 25-year heat exchanger coverage, 5-year parts, and 1-year labor
- CB Combi-Boiler: 12-year heat exchanger coverage, 5-year parts, and 1-year labor
- Heat exchanger failure on the EZ Series Tankless and CB Combi-Boiler
What's NOT Covered
Noritz lists 4 situations that fall outside coverage on its 2 lines:
- Scale and lime buildup from hard water
- Improper installation or venting
- Lack of annual maintenance
- Use of unauthorized parts
How to File a Noritz Warranty Claim
- 1
Register your product at noritz.com
- 2
Contact Noritz support at 866-766-7489
- 3
Work with an authorized service provider for diagnosis and repair
Noritz warranty line: 866-766-7489
Warranty Transferability: No
Warranty is for the original owner only and is not transferable.
Bought a home that came with a Noritz unit? Because Noritz 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 Noritz line at 866-766-7489 (labor help is limited to 1 year from install).
Additional Notes
Noritz is a Japanese manufacturer that has been making tankless water heaters since 1951. They focus exclusively on tankless technology and are sold through professional contractors.
Noritz Warranty FAQ
How many years does the Noritz heat exchanger warranty last?
Noritz tank or heat exchanger coverage ranges from 12 to 25 years, from the CB Combi-Boiler up to the EZ Series Tankless. Parts are covered for up to 5 years and labor for up to 1 year.
Can I transfer a Noritz tankless warranty to a new owner?
No. Noritz warranties are not transferable. Warranty is for the original owner only and is not transferable.
How do I check whether my Noritz tankless 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 (EZ Series Tankless and CB Combi-Boiler). You can also call Noritz at 866-766-7489 with your serial number.
What voids a Noritz tankless warranty?
Common warranty voiding issues for Noritz include: Scale and lime buildup from hard water; Improper installation or venting; Lack of annual maintenance.
Does Noritz sell an extended warranty for the EZ Series Tankless and CB Combi-Boiler?
The EZ Series Tankless and CB Combi-Boiler carry only the standard Noritz factory warranty shown above; no separate extended plan is listed. Ask about dealer coverage when you call 866-766-7489.
What should I do if my Noritz tankless fails under warranty?
Register your product at noritz.com. Then contact Noritz support at 866-766-7489. The Noritz warranty line is 866-766-7489.
More for Your Noritz Water Heater
Not sure which of Noritz's 2 lines you have?
Coverage differs across Noritz's lines, so decode your serial number to find the manufacture date and match it to the right 2-line warranty range above.
Decode Your Noritz Serial NumberThe 2 coverage figures shown above were last verified in March 2026 and are provided as a helpful reference only. Warranty terms are set by Noritz 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 Noritz or Noritz America Corporation.