FAQS

Frequently Asked Questions About Navien Tankless Condensing Water Heaters

  • Can I use ½” gas pipe with the NPE condensing gas tankless water heater?

    ½” gas pipe can be used when installing a NPE condensing gas tankless water heater as long as it is sized appropriately.

    Pipe size, length of gas pipe, and pressure drop are all factors that affect gas delivery.

    Please refer to the National Fuel Gas Code gas pipe sizing table to ensure you have sufficient gas supply for the unit.

  • Does the NPE condensing tankless gas water heater have to be the first appliance off the gas meter?

    No, it is not required that the NPE condensing tankless gas water heater be the first appliance off the gas meter.

    It can be installed using the existing infrastructure and can go in place of a traditional tank water heater so long as the gas line is size appropriately and can delivery sufficient gas supply to the unit.

  • What type of venting can I use for the NPE condensing tankless gas water heater?

    The NPE is approved to be vented with 2”vent material (maximum length of 60’, maximum of 6 elbows, and reduce 8 linear feet per 90° elbow). 3” vent material can also be used (maximum length of 150’, maximum of 8 elbows, and reduce 5 linear feet per 90° elbow).

    Approved vent materials are PVC Schedule 40, CPVC Schedule 80, ApprovedPolypropylene.

  • Can I use PVC with the NPE condensing tankless gas water heater?

    Yes, with the NPE condensing tankless gas water heater you can use PVC Schedule 40, which allows for zero inch clearance to combustibles.

  • Does the NPE condensing tankless gas water heater include a remote?

    Yes, the NPE has built in display and control allowing for simple and easy operation. There will be an optional external remote available for purchase in late 2012.

  • What is ComfortFlow technology?

    ComfortFlow technology is a proprietary system that incorporates a buffer tank and recirculation pump.

    The buffer tank will reduce “cold water sandwich” effects commonly found with tankless products and the recirculation pump will minimize the amount of time required for delivery of hot water to fixtures.

  • Can the NPE be mounted outdoors?

    Yes, the NPE can be mounted outdoors using the Navien Outdoor Vent Kit. It is recommended the unit only be mounted outdoors in mild climates.

    Please follow proper instruction procedures outlines in installation manual.

  • Is the NPE gas field convertible?

    Yes, the NPE is gas field convertible.

    The default gas type for the unit will be Natural Gas (NG).
    To convert the unit for LP use, please use gas conversion kit supplied with unit.
    This should only be performed by a qualified service agency in accordance with Navien America’s instructions.

  • Is there commercial model available for the NPE series?

    The NPE is approved for use in residential, commercial, and heating (combination only) applications.

    If used in commercial or heating application, the warranty will be adjusted to 10 years on the heat exchanger, 3 years on any other parts, and 1 year labor.