Navien NPE-240S Premium Condensing Tankless Gas Water Heater


Navien’s units have built in controls for multi-unit system allowing easy setting.
No extra control boards are required, reducing installation costs.
Easy wiring between units and easy setting of the parent and child for multi-unit system.
16 units can be linked as one group and cascade as many groups as you need.
Cascading allows for added redundancy insuring on-demand hot water in all situations.
Small and compact wall-hung design allows multi-unit system even in a confined area.
Used for hotels, schools, hospitals, beauty shops, restaurants, health centers, and more.

25 in stock


  • Ultra Condensing Efficiency

    Ultra Condensing Efficiency

    • Navien’s Condensing Technology offers high efficiency.
    • Money and energy savings over tank type water heaters and traditional water heaters.
  • Two Stainless Steel Heat Exchangers

    Two Stainless Steel Heat Exchangers

    • Provides longer life expectancy as they are highly resistant to corrosion and erosion compared to copper heat exchangers.
    • Reduces minerals deposits.
  • Low NOx Emissions (≤ 20ppm)

    Low NOx Emissions (≤ 20ppm)

    • New metal fiber burner is designed to deliver a consistent air/gas mixture improving combustion efficiency.
    • Result in less acid rain and less green house effect.
    • Comply with SCAQMD 1146.2 strict NOx emissions standard.
  • 2” PVC, CPVC, Polyprophylene Venting Up To 60’

    2″ PVC, CPVC, Polypropylene Venting Up To 60′

    • 2″ venting option allows for a flue to be pulled through the existing vent.
    • 3″ venting can be used up to 150′ with standard 2″ x 3″ adapters.
  • Better Adaptability to Gas System

    Utilizes Existing 1/2″ Gas Line

    • The negative pressure gas valve and fan with dual venturi operation allows for better adaptability to low gas pressure applications.
    • Makes it possible for the NPE tankless water heater to be installed using 1/2″ gas lines up to 24′.
  • Field Convertible

    Field Convertible

    • NPE tankless water heater models allow for easy convertibility from NG to LP.
  • Ultra Condensing Efficiency

    Less Water Pressure Drop

    • Simple modular for water path minimizes water pressure drop.
    • Modular design for water path make maintenance easier and service can be performed easily in the field.

title icon Offers the ultimate hot water experience


Multiple units can be connected
in parallel for larger applications.

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    Front Panel Command Center

    • Self-diagnostics
    • Displays temperature and water flow rate
    • Displays status of cascade operation
    • Convertible display from °F to °C
    • User Friendly Interface
    • Easy setup
    • Data FieldNPE-240S
      Heat Capacity (Input)Natural Gas19,900-199,900 BTU/h
      Propane Gas19,900-199,900 BTU/h
      Efficiency RatingsUEF (for NG & LP)0.97
      EF (Canada) (for NG & LP)0.99
      Flow Rate (DHW)35⁰F(19⁰C) Temp Rise11.2 GPM (42 L/m)
      45⁰F(25⁰C) Temp Rise8.7 GPM (33 L/m)
      67⁰F(36⁰C) Temp Rise5.7 GPM (22 L/m)
      Dimensions17.3″(W) x 27.4″(H) x 13.2″(D)
      Weight75 lbs (34kg)
      Installation TypeIndoor or Outdoor Wall-Hung
      Venting TypeForced draft direct vent
      IgnitionElectronic Ignition
      Water Pressure15-150 PSI
      Natural Gas Supply Pressure (from source)3.5″-10.5″ WC
      Propane Gas Supply Pressure (from source)8″-13″ WC
      Natural Gas Manifold Pressure (min to max)-0.04″ WC to -0.58″ WC
      Propane Gas Manifold Pressure(min to max)-0.02″ WC to -0.78″ WC
      Minimum Flow Rate0.5 GPM (1.9 L/m)
      Connection SizesCold Water Inlet3/4″ NPT
      Hot Water Outlet3/4″ NPT
      Gas Inlet3/4″ NPT (suitable for use with 1/2″ rigid gas pipe; refer to installation manual for sizing criteria)
      Power SupplyMain Supply120 V AC, 60Hz
      Main Supply200 W (max 2A), 350W (max 4A) with external pump connected
      MaterialsCasingCold rolled carbon steel
      Heat Exchangersprimary and secondary heat exchangers: stainless steel
      VentingExhaust2″ or 3″ PVC, CPVC, polypropylene 2″ or 3″ special gas vent type BH (Class II, A/B/C)
      Intake2″ or 3″ PVC, CPVC, polypropylene 2″ or 3″ special gas vent type BH (Class II, A/B/C)
      Vent Clearances0″ to Combustibles
      Safety DevicesFlame rod, APS, ignition operation detector, water temperature high limit switch, exhaust temperature high limit sensor, power surge fuse
    • Warranty Period

    • Navien products come with a limited warranty covering labor, parts and the heat exchanger. The following warranty periods begin to run from the date of original installation. The date of original installation must be provided to Navien, and upon request, proof of the original installation date must also be provided to Navien.

      When the product is installed in a new construction, the commencement date shall be dated upon which the end-user takes title to the property.

      Applicable Warranty Periods

      ProductLabor WarrantyParts WarrantyHeat Exchanger Warranty
      NPE Series Water Heater
      Standard or Cont.-Recirc.21 year5 years15 years
      Uncont.-Recirc.31 year3 years5 years
      NPE Series Water Heater
      (commercial or Combi1)
      Standard or Cont.-Recirc.2
      for units produced on or after january 1, 2016
      1 year5 years8 years
      Standard or Cont.-Recirc.2
      for units produced before january 1, 2016
      1 year3 years10 years
      Uncont.-Recirc.31 year3 years3 years

      1Combi refers to a combination potable water and space heating application. Water heaters cannot be used in space heating only applications.

      2Controlled-Recirculation : Recirculation the water heater is controlled by either the water heater or an external aquastat.

      3Uncontrolled-Recirculation : External pumps configured to circulate continuously through the water heater are subject to the uncontrolled recirculation warranty terms. An aquastat is the minimum pump control requirement for DHW or storage tank recirculation in order to maintain the full controlled warranty.

      Warranty Claim Procedures

      To obtain warranty repair service, the end user or homeowner must contact the original installer of your Navien product. If the original installer cannot be identified, the end user or homeowner may contact Navien’s Technical Administration Department. Proof of purchase is required to obtain warranty service.

      Warranty Service

      At its option, Navien will replace the defective component part(s) or product, in accordance with the terms of this Limited Warranty, if it fails in normal use and service during the Applicable Warranty Period identified below. The replacement component part(s) must be Navien original factory component part(s). The replacement component part(s) will be warranted only for the unexpired portion of the original component part’s Applicable Warranty Period. Payment for labor in completing the warranty service is subject to Navien’s prior written approval and shall be subject to Navien’s schedule of approved labor allowances.

      Parts Warranty (excluding Heat Exchanger)

      The Applicable Warranty Period for a CH series Part(s) failure installed in a Residential application is Five (5) years from the Effective Date.


Additional information

Weight69.8532 kg
Dimensions24.5 × 28.5 × 34.5 cm


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