• NC250-SV-ASME
  • NC250-DV-ASME

NC250 (N-0931M) SERIES
NC250 Series ASME Tankless Water Heater


For the first time Noritz is offering true commercial grade components and materials inside and out. A re-engineered heat exchanger and industry first dual flame burner boost the heater's power, while lowering minimum flow requirements.  To help ensure the longevity of its performance, we have enclosed the heater’s commercial grade components with a corrosion-free stainless steel exterior casing, giving the look and feel of other professional grade equipment.  The NC250 series offers direct vent (DV) units that are ideal for commercial businesses such as restaurants and hair salons that have contaminants in the air.  The NC250-SV-ASME is for indoor/outdoor use.  PVC CANNOT be used for venting.  The NC250-DV-ASME is for indoor use only.  

>> Available in Natural Gas (NG) and Propane (LP) models only.
>> Thermal Efficiency: 84%
>> Dual flame burner - Noritz exclusive!  Minimizes temperature fluctuations.
>> WARNING!!!  PVC cannot be used for venting.  Use only Category III (4" stainless steel venting).


Installation #1     Before     After                       

Installation #2     Before     After




  • Isolation valves (#IK-WV-200-1-TH or #IK-WV-200-1-SW)
  • Outdoor vent cap (#VC-4-1) for NC250-SV-ASME model only.
  • Pipe cover (#PC-3S-SUS)
  • Remote controller outdoor junction box (#RC-OJB)
  • ScaleShield (#SS-HB-2)
  • Commercial H2Flow (#CH2F-*) *depends on number of units and total flow rate
  • Quick-connect cable (#QC-1)
  • Multi-system controller (#SC-201-6M, -12M, -24M)