For NR/NP Series installed in residential applications (Domestic Hot Water Use Only): 15 Years on the Heat Exchanger, 5 years on all other parts and components, and 1 year on labor (manufacturer’s defect).
For NP Series installed in commercial use or residential space heating use: 10 Years on the Heat Exchanger, 3 years on all other parts and components, and 1 year on labor (manufacturer’s defects).
Navien recommends that you contact your original installer if you have any issues with your product. In the event you need a field technician to service your unit, we have a network of Navien Service Specialists (NSS).
These are third party companies that have completed factory training to service our products.
The labor warranty on tankless water heater and boiler products is one year from original installation date for manufacturer’s defect.
Labor charges outside the one year period or not deemed a manufactured defect will not covered by Navien.
The issue is most likely the flow sensor inside the unit is not spinning properly. While using hot water check if unit is detecting flow rate. If the unit stays at zero GPM flow sensor needs to be serviced or changed. Please contact Navien Technical Support while you are in front of the unit.