Gas Water Heater – NPE-210S

Max Input : 180,000 BTU/H
Indoor/Outdoor Installation

  • ½” gas pipe capable up to 24’
  • Field convertible gas system
  • Ultra condensing efficiency .99EF
  • Dual stainless steel heat exchangers
  • Low NOx emissions (≤ 20ppm)
  • SCH 40, 2” venting up to 60’
  • Cascading capable


Ultra Condensing Efficiency

  • Navien’s Condensing Technology offers the high efficiency.
  • Money and energy savings over tank type water heaters and traditional water heaters.

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)

  • 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, 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.

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 to be installed ½” gas lines up to 24’.

Field Convertible

  • NPE models allow for easy convertibility from NG to LP.

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.


Data Field NPE-210S
Heat Capacity (Input) Natural Gas 19,900-180,000 BTU/h
Propane Gas 19,900-180,000 BTU/h
Efficiency Ratings UEF (for NG & LP) 0.97
EF (Canada) (for NG & LP) 0.99
Flow Rate (DHW) 35⁰F(19⁰C) Temp Rise 10.1 GPM (38 L/m)
45⁰F(25⁰C) Temp Rise 7.8 GPM (30 L/m)
67⁰F(36⁰C) Temp Rise 5.2 GPM (20 L/m)
Dimensions 17.3″(W) x 27.4″(H) x 13.2″(D)
Weight 75 lbs (34kg)
Installation Type Indoor or Outdoor Wall-Hung
Venting Type Forced draft direct vent
Ignition Electronic Ignition
Water Pressure 15-150 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 -0.36″ WC
Propane Gas Manifold Pressure(min to max) -0.02″ WC to -0.66″ WC
Minimum Flow Rate 0.5 GPM (1.9 L/m)
Connection Sizes Cold Water Inlet 3/4″ NPT
Hot Water Outlet 3/4″ NPT
Gas Inlet 3/4″ NPT (suitable for use with 1/2″ rigid gas pipe; refer to installation manual for sizing criteria)
Power Supply Main Supply 120 V AC, 60Hz
Maximum Power Consumption 200 W (max 2A), 350W (max 4A) with external pump connected
Materials Casing Cold rolled carbon steel
Heat Exchangers primary and secondary heat exchangers: stainless steel
Venting Exhaust 2″ or 3″ PVC, CPVC, polypropylene 2″ or 3″ special gas vent type BH (Class II, A/B/C)
Intake 2″ or 3″ PVC, CPVC, polypropylene 2″ or 3″ special gas vent type BH (Class II, A/B/C)
Vent Clearances 0″ to Combustibles
Safety Devices Flame rod, APS, ignition operation detector, water temperature high limit switch, exhaust temperature high limit sensor, power surge fuse

Spec Sheet