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Noritz America NC1991-DVC-NG 199,900 Btu Ultra Low Commercial Indoor


Noritz America NC1991-DVC-NG 199,900 Btu Ultra Low Commercial Indoor

With more power than any tankless water heater in its class, the NC1991 series is ideal for mid-size homes with up to 4 showers. Built-in features include safety lock-out, freeze protection, and high elevation adjustment. PVC CANNOT be used for venting.

These units offer several innovations:
Safety lock out - Default max. 120 degrees (refer to owner's manual for higher temp)
Fully modulating - Automatically adjusts burner level accordingly.
Turbo Flow - Up to 9.8 GPM @ 35 degree temperature rise (7.5 GPM @ 45 degree rise).
Quick Connect - Doubles the output by connecting two identical heaters.
Direct ignition - No standby pilot light.
Thermal fuse - Automatic overheat protection system.
Resin coated PC board - Increases durability and protection from elements.
Automatic air regulator - Monitors internal temperature/maximizes burner efficiency.
Commercial grade heat exchanger - 25% thicker piping than our competition.

Available in Natural Gas (NG) and Propane (LP) models only.

  • Temperature Settings: 100-180oF (14 options)
  • Thermal efficiency for all models: 84%
  • Self-diagnostic onboard computer system
  • Back-up battery compatible
  • Recirculation compatible
  • Digital remote included

WARNING!!! PVC cannot be used for venting. Use only Category III (4" stainless steel venting). N-0751M-DVC requires 3" x 5" concentric-type stainless steel venting.

Available Models:



  • Isolation valves (#IK-WV-200-1-TH or #IK-WV-200-1-SW)
  • Pipe cover (NC199-DVC use #PC-5S)
  • Remote controller outdoor junction box (#RC-OJB)
  • ScaleShield (#SS-HB-1)
  • Commercial H2Flow (#CH2F-*) *depends on number of units and total flow rate
  • Quick-connect cable (#QC-2)
  • System Controller (#SC-301-6M)
  • Recess box (#RB-700) for NC1991-OD model only.
Performance Data:
Capacity, (BTU): 199900
Minimum Input, (BTU): 11000
Maximum Input, (BTU): 199900
Ignition Type: Electronic Ignition
Heat Exchanger: Commercial Grade Copper
Efficiency, (%): 84
Voltage: 120
Power Consumption, (W): 100
Dimensional Data:
Width, (in): 13.8
Depth, (in): 10.6
Height, (in): 22.3
Hot Water Outlet Height from Bottom, (in): 1.8
Cold Water Inlet Height from Bottom, (in): 2.2
Gas Inlet Height from Bottom, (in): 2.2
Weight, (lbs): 73

Warranty Information

Parts Warranty: 5 years
Heat Exchanger Warranty: 5 years
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Product Reviews

  1. Great Purchase 5 Star Review

    Posted by on 2nd Jul 2014

    Truly the best heater I have owned. It is so much easier to use and installation isn't even that bad. I really recommend this for anyone that wants an easy and worthwhile buy.