Navien NPE-S

Navien Condensing Tankless Gas Water Heater (NPE-S)

What makes this version different than the NR or even the Navien NPE-A tankless?

The NPE-S tankless is basically the exact same as the NPE-A but it lacks the buffer tank and the recirculation pump. If these are two options you dont need than the NPE-S is great, reliable tankless that is a few hundred dollar cheaper than the NPE-A.

To elaborate, Navien has split the names and models of their tankless systems up. The NPE-A and the NPE-S each have three sizes consisting of the 180, 210, and, 240. The letter A and letter S are added to the end and represent whether the system has the buffer tank and recirculation pump (NPE-A) or if it doesn’t (NPE-S).New Generation Navien Tankless

Pricing and Quotes For The Navien NPE-A

  • Purchase Price – Starting at $2595 with full installation included.
  • Rental Price – Starting at $29.95
  • Service Calls – Depends on the issue
  • Flush Service – $119

Venting, water lines, gas lines, and various other factors can change the price enough that it makes it hard to give an exact price without seeing the installation location. We offer 100% accurate and free quotes good for 30 days. Give us a call to schedule a tech to come out to your home today.


Call To Schedule A Free Quote For A Navien (647) 925-1930



  • Ultra Condensing Efficiency

    • Navien’s Condensing Technology offers the highest efficiency available.
    • Money & Energy savings over traditional water heaters.
  • Two Stainless Steel Heat Exchangers
    • These provide the tankless with a longer life expectancy.
    • Highly resistant to corrosion compared to copper heat exchangers.
    • Reduced minerals deposits with stainless steel.
  • Low NOx Emissions (≤ 20ppm)
    • Newly designed burner delivers a consistent air/gas mixture improving combustion efficiency.
    • Greater efficiency reduces emissions and reduces green house gases.
    • This new tankless complies with SCAQMD 1146.2 strict NOx emissions standards.
  • 2” PVC, CPVC, Polypropylene Venting Up To 60’
    • 2” venting option allows for a flue to be pulled through the existing vent.
    • 3” vents can be used up to 150’ with standard 2” x 3” adapters.
  • Utilize Existing 1/2″ Gas Line
    • The negative pressure gas valve and fan with dual venturi operation allows for better adaptability in low gas pressure applications.
    • These upgrades make it possible for the NPE to be installed with ½” gas lines up to 24’ long.
  • Field Convertible
    • NPE models allow for easy convertibility from Natural Gas to Propane.
  • Reduced Water Pressure Drop
    • Revised water path minimizes water pressure drop with a shorter distance.
    • This new design makes maintenance and service easier in the field.
  • Intelligent Preheating Technology
    • Recognizes hot water usage patterns to intelligently provide hot water when needed.


Residential Applications

Heat Exchangers – 15 years

Parts and Components – 5 years

Labour – 1 year


Commercial Applications

Heat Exchangers – 10 years

Parts and Components – 3 years

Labour – 1 year


Specifications For The Navien NPE-S


Data FieldsNPE-180S
Heat Capacity (Input)Natural Gas15,000-150,000 BTU/h
Heat Capacity (Input)Propane Gas15,000-150,000 BTU/h
Energy Factor NG / LPG (DOE)0.97/0.97
Flow Rate (DHW)35F (19C) Temp Rise8.4 GPM (32 L/m)
Flow Rate (DHW)45F (25C) Temp Rise6.5 GPM (25 L/m)
Flow Rate (DHW)77F (43C) Temp Rise3.8 GPM (14 L/m)
Data FieldsNPE-210S
Heat Capacity (Input)Natural Gas19,900-180,000 BTU/h
Heat Capacity (Input)Propane Gas19,900-180,000 BTU/h
Energy Factor NG / LPG (DOE)0.97/0.97
Flow Rate (DHW)35F (19C) Temp Rise10.1 GPM (38 L/m)
Flow Rate (DHW)45F (25C) Temp Rise7.8 GPM (30 L/m)
Flow Rate (DHW)77F (43C) Temp Rise4.6 GPM (17 L/m)
Data FieldsNPE-240S
Heat Capacity (Input)Natural Gas19,900-199,900 BTU/h
Heat Capacity (Input)Propane Gas19,900-199,900 BTU/h
Energy Factor NG / LPG (DOE)0.97/0.97
Flow Rate (DHW)35F (19C) Temp Rise11.2 GPM (42 L/m)
Flow Rate (DHW)45F (25C) Temp Rise8.7 GPM (33 L/m)
Flow Rate (DHW)77F (43C) Temp Rise5.1 GPM (19 L/m)
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 -0.84″ WC
Propane Gas Manifold Pressure(min to max)-0.03″ WC to -0.50″ WC
Minimum Flow Rate0 GPM (0 L/m)
Connection SizesCold Water Inlet3/4″ NPT
Connection SizesHot Water Outlet3/4″ NPT
Connection SizesRecirculation Inlet3/4″ NPT
Connection SizesGas 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
Power SupplyMaximum PowerConsumption200W (max 2A), 350W (max 4A) with external pump connected
MaterialsCasingCold rolled carbon steel
MaterialsHeat ExchangersPrimary & Secondary Heat Exchanger: Stainless Steel
VentingExhaust– 2″ or 3″ PVC
– Polypropylene 2″ or 3″ Special Gas Vent Type BH (Class II, A/B/C)
VentingIntake– 2″ or 3″ PVC
– Polypropylene 2″ or 3″ Special Gas Vent Type BH (Class II, A/B/C)
VentingVent Clearances0″ to Combustibles
Safety Devices– APS
– Ignition Operation Detector
– Water Temperature High Limit Switch
– Exhaust Temperature High Limit Sensor
– Power Surge Fuse

Heat Exchanger

Navien tankless water heaters utilizes dual stainless steel heat exchangers, providing 3.8 to 4.5 times longer life-expectancy and erosion resistance over the copper heat exchangers used in other tankless brands. Navien’s heat exchangers operate with relatively low water temperature, minimizing damage from hard water conditions and maintains efficiency levels. It’s always important to have your tankless flushed once every 2 years or so to remove any buildup from within the heat exchangers.


Because of Navien’s high efficiency the tankless can be vented in PVC piping. Basically, excess heat is exhausted with all the combustion gasses in conventional tank systems but a Navien uses this to pre-heat incoming water. This results in significantly lower exhaust temperatures allowing for the use of PVC exhaust vent piping.

Links and Further Info

Interested in seeing if a Navien will work in your home? Give us a call and we can answer any question.

Call: 647 925 1930 — Or have us call you.. Fill Out Our Form

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