• NCC199-SV
  • NCC199-DV

NCC1991 Series Condensing Tankless Water Heater


The BEST CONDENSING tankless water heater.

"The most advanced Noritz heater - over 93% efficient"
Noritz is proud to introduce our most efficient tankless heaters, the next generation in tankless technology - condensing heaters.  This innovation utilizes a dual heat exchanger, a fusion of stainless steel and copper heat exchangers.  The 100% stainless steel component captures the residual heat from the exhaust temperature to preheat the incoming water before it runs through the main copper heat exchanger.  This results in dramatic reduction of carbon dioxide and increases the heater's efficiency level to over 93%!  Another benefit of this technology is lower exhaust temperatures, which means less costly PVC can be used for its venting.
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 NCC1991 series is the most versatile unit since it can be used for both residential and commercial applications. 
It's the coolest and greenest tankless water heater available today!  This is the highest performing condensing unit on the market today.  Some other brand(s) may have a bit higher efficiency rating, but there is a fine balance between the efficiency level and flow rate performance.  At Noritz we strive to maximize efficiency levels without sacrifing the hot water output, temperature fluctuations, and water pressure.  Comfort and safety is something we do not compromise on.
Compare specifications: click here.
Built-in features include safety lock-out, freeze protection, and high elevation adjustment.  These units also offer several innovations:
Condensing technology - The most advanced Noritz unit, over 93% efficiency level!
Combi-system set-up - Open loop system functionality for both potable water heating and space heating combination system.
Safety lock out - Default max. 120 degrees (refer to owner's manual for higher temp)
Dual flame burner - Noritz exclusive!  Minimizes temperature fluctuations.
Fully modulating - Automatically adjusts burner level accordingly.
Dual heat exchanger - 100% stainless steel corrosion resistant heat exchanger fused with a commercial grade copper heat exchanger.
Turbo Flow - Up to 11.1 GPM @ 35 degree temperature rise (8.4 GPM @ 45 degree rise).
Quick Connect - Doubles output by connecting 2 identical units with a single cable.
Multi System - Up to 24 units can be linked and operated by a single system controller.
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.
Neutralizer included - Built-in neutralizing system for condensation.
Commercial grade heat exchanger - 25% thicker piping than our competition.
>> Available in Natural Gas (NG) and Propane (LP) models only.


>> ATTENTION!!!  3" or 4" PVC venting can only be used on condensing heaters.




Click here for actual home installation photo. 

Click here for commercial install at a hotel.


  • Keypad/Thermostat Display included
  • Compatible remote controller (part # RC-9018M)
  • Isolator Valve (part # IK-WV-200-1-XX)
  • Freeze Protection included
  • Pipe Cover (part # PC-3S-SUS)
  • High Elevation Adjustment included
  • Quick-Connect Cord (part # QC-2)
  • System Controller (part # SC-301[-6M, -12M])
  • Remote Controller Cord included
  • Compatible Remote Controller Cord (part # RC-CORD10)
  • Power Cord included (-DV only)