Navien Water Heater Warranty Guide
Manufactured by Navien Inc. · Warranty info last verified: March 2026
Navien water heaters are covered by Navien Inc. This guide covers 4 product lines: the NPE-A2 Condensing Tankless, NPE-S2 Condensing Tankless, NFC Condensing Combi-Boiler, and NFB Condensing Boiler. Across those lines, tank or heat exchanger coverage climbs from 10 years on the NFB Condensing Boiler to 15 years on the NPE-A2 Condensing 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 800-519-8794.
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 |
|---|---|---|---|
NPE-A2 Condensing Tankless Premium condensing tankless. 15-year heat exchanger warranty is among the best in the industry. | 15 yr | 5 yr | 1 yr |
NPE-S2 Condensing Tankless High-efficiency condensing tankless. | 15 yr | 5 yr | 1 yr |
NFC Condensing Combi-Boiler Combination space heating and hot water unit. | 15 yr | 5 yr | 1 yr |
NFB Condensing Boiler Heating-only boiler. | 10 yr | 5 yr | 1 yr |
How to Register Your Navien Water Heater
There is no strict registration deadline listed for Navien, 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 800-519-8794 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 Navien paperwork in case you later call 800-519-8794.
What's Covered
- Defects in materials and workmanship under normal residential use
- NPE-A2 Condensing Tankless: 15-year heat exchanger coverage, 5-year parts, and 1-year labor
- NPE-S2 Condensing Tankless: 15-year heat exchanger coverage, 5-year parts, and 1-year labor
- NFC Condensing Combi-Boiler: 15-year heat exchanger coverage, 5-year parts, and 1-year labor
- NFB Condensing Boiler: 10-year heat exchanger coverage, 5-year parts, and 1-year labor
- Heat exchanger failure on the NPE-A2 Condensing Tankless, NPE-S2 Condensing Tankless, NFC Condensing Combi-Boiler, and NFB Condensing Boiler
What's NOT Covered
Navien lists 5 situations that fall outside coverage on its 4 lines:
- Failure to perform annual maintenance or descaling
- Hard water damage without water treatment
- Improper installation
- Commercial use of residential models
- Use of non-authorized parts in repairs
How to File a Navien Warranty Claim
- 1
Register your product at navien.com/product-registration
- 2
Contact Navien support at 800-519-8794
- 3
Technical support will help diagnose the issue remotely
- 4
If a warranty claim is approved, Navien dispatches through their authorized service provider network
Navien warranty line: 800-519-8794
Warranty Transferability: No
Standard warranty is for the original purchaser only.
Bought a home that came with a Navien unit? Because Navien 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 Navien line at 800-519-8794 (labor help is limited to 1 year from install).
Additional Notes
Navien's 15-year heat exchanger warranty is one of the longest available in the tankless water heater industry and is a major selling point. Navien also features a built-in recirculation pump. Professional installation by a licensed contractor is required for warranty coverage.
Navien Warranty FAQ
How many years does the Navien heat exchanger warranty last?
Navien tank or heat exchanger coverage ranges from 10 to 15 years, from the NFB Condensing Boiler up to the NPE-A2 Condensing Tankless. Parts are covered for up to 5 years and labor for up to 1 year.
Can I transfer a Navien tankless warranty to a new owner?
No. Navien warranties are not transferable. Standard warranty is for the original purchaser only.
How do I check whether my Navien 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 (NPE-A2 Condensing Tankless, NPE-S2 Condensing Tankless, NFC Condensing Combi-Boiler, and NFB Condensing Boiler). You can also call Navien at 800-519-8794 with your serial number.
What voids a Navien tankless warranty?
Common warranty voiding issues for Navien include: Failure to perform annual maintenance or descaling; Hard water damage without water treatment; Improper installation.
Does Navien sell an extended warranty for the NPE-A2 Condensing Tankless, NPE-S2 Condensing Tankless, NFC Condensing Combi-Boiler, and NFB Condensing Boiler?
The NPE-A2 Condensing Tankless, NPE-S2 Condensing Tankless, NFC Condensing Combi-Boiler, and NFB Condensing Boiler carry only the standard Navien factory warranty shown above; no separate extended plan is listed. Ask about dealer coverage when you call 800-519-8794.
What should I do if my Navien tankless fails under warranty?
Register your product at navien.com/product-registration. Then contact Navien support at 800-519-8794. The Navien warranty line is 800-519-8794.
More for Your Navien Water Heater
Not sure which of Navien's 4 lines you have?
Coverage differs across Navien'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 Navien 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 Navien 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 Navien or Navien Inc..