Tankless water heater installation must be done by a licensed professional. Using a Navien Service Specialist may save you time and money in the long run due to their familiarity with the product.
Make sure your service provider calls Navien’s Technical Support Department while in front of your unit, before starting any repairs.
800-519-8794, option 2.
We also recommend that you report any maintenance at 800-519-8794, option 2 or option 3.