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Navien NPE-240S2 Water Header

High efficiency Condensing Tankless Water Heater

  • ½” gas pipe capable up to 24′
  • Field convertible gas system
  • Ultra condensing efficiency
  • Dual stainless steel heat exchangers
  • Low NOx emissions (20ppm)
  • SCH 40, 2″ venting up to 75′
  • Cascading capable
  • EZNav multi-line control panel
  • Built-in HotButton control panel
  • Common vent up to 12 units
ItemNPE-240S2
Heat Capacity (input)Natural gas13,300 - 199,900 BTU/h (3.9 - 58.57 kWh)
Propane13,300 - 199,900 BTU/h (3.9 - 58.57 kWh)
Efficiency ratingsUEF (NG & LP)0.96
Flow rate (DHW)35°F temp rise11.2 GPM (42.4 l/m)
45°F temp rise8.7 GPM (32.9 l/m)
67°F temp rise5.8 GPM (22 l/m)
Dimensions17.3" W x 27.4" H x 13.2" D (43.9cm W x 69.6cm H x 33.5cm D)
Boiler weight73 lbs (33.1 kg)
Installation locationIndoor or outdoor wall-hung
Venting typeForced draft direct-vent
IgnitionElectronic ignition
Water pressure15-150 PSI (1.05-10.55 kg/cm2)
Natural gas supply pressure (from source)3.5 " WC to 10.5 " WC (0.87 kPa to 2.61 kPa)
Propane gas supply pressure (from source)8 " WC to 13 " WC (1.99 kPa to 3.23 kPa)
Natural gas manifold pressure (min-max)-0.03 " WC to -0.96 " WC (-0.0075 kPa to -0.24 kPa)
Propane gas manifold pressure (min-max)-0.02 " WC to -0.96 " WC (-0.005 kPa to -0.24 kPa)
Minimum flow rate0.5 GPM (1.9 l/m)
Connection sizesCold water inlet3/4" NPT
Hot water outlet size3/4" NPT
Gas inlet3/4" NPT
Power SupplyMain supply120V AC, 60 Hz
Maximum power consumption200 W (max 2 A), 350 W (max 4 A) with external pump connected
MaterialsCasingCold rolled carbon steel
Heat exchangers

Primary heat exchanger: stainless steel

Secondary heat exchanger: stainless steel

VentingExhaust2" or 3" PVC, CPVC, approved polypropylene and stainless steel 2" or 3" special gas vent type BH (Class II, A /B/C)
Intake2" or 3" PVC, CPVC, approved polypropylene and stainless steel 2" or 3" special gas vent type BH (Class II, A /B/C)
Vent clearances0" to combustibles
High elevations10,100 feet for both NG or LP gas. Please refer to Installation Manual for additional details and instructions.
Safety DevicesFlame rod, APS, ignition operation detector, water temperature high limit switch, exhaust temperature high limit sensor, power surge fuse, burner high limit fuse, vent installation detector (VID)

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