NC1991 Commercial Tankless Water Heater

by Noritz


The high performing water heaters you're looking for are right here at PlumbingSupply.com®! Make the switch from your bulky, tank-style water heater and bring the state of the art Noritz technology, efficiency, and flexible installation options into your home. Their tankless water heaters provide an endless supply of perfectly heated, fresh water every time you use it, and save space, money, and water, making these tankless water heaters well worth the switch.

Noritz NC1991 Series Tankless Water Heaters

Noritz tankless water heater
These tankless water heaters feature:
  • Designed for versatility, this unit can provide endless hot water for up to 4 showers in a residential setting, or connected in series for commercial applications
  • Quick-connect system allows the installer to connect 2 units for increased hot water demands
  • Connect up to 24 units under the same controller system to meet even greater hot water demands
  • Direct vent (DV) models draw air from the outdoors so they do not use any air from the indoor installation location, making them ideal for tight spaces or where indoor air is unsuitable for combustion
  • Direct ignition means no standby pilot light to waste energy
  • Commercial grade heat exchanger and fully modulated burner work together to provide increased efficiency, to stabilize temperature fluctuations, and boost performance of the flow rate for long life under heavy use
  • Self-diagnostic onboard computer system, combined with the included digital remote, provides ease of maintenance and temperature adjustment
  • Direct vent units use 3" x 5" concentric stainless steel vent pipe
  • Dimension: 23.6"h x 13.8"w x 9.4"d
  • View Specifications
  • View Flow Rate Chart

Model Description Natural Gas Propane
NC1991-OD Outdoor Installation Tankless Water Heater $1,395.78 $1,399.92 Enter a quantity and
NC1991-DVC Indoor Concentric Vent Tankless Water Heater $1,390.60 $1,395.87 Enter a quantity and
Due to size/weight and to ensure safe delivery, certain items ship by truck and have a $175 additional shipping fee per freight item.
Please select your type of address:
Commercial -or- Residential

Accessories for Noritz Tankless Water Heaters

Multi-Unit Connections for Model NC1991

Description Price & Quantity
QC-2 Quick-Connect Cord - connects two identical units $29.72 Enter a quantity and
Multi-Unit System Controller for up to 6 units $429.21 Enter a quantity and
Multi-Unit System Controller for up to 12 units $929.38 Enter a quantity and
Multi-Unit System Controller for up to 24 units $1,700.17 Enter a quantity and

Brass Pressure Relief Valves

Image Description Size Price & Quantity
Pressure relief valve Brass Pressure Relief Valve
  • A pressure relief valve is required for all tankless water heaters. In some areas, a temperature and pressure relief valve is required. Check your local plumbing code for more information
3/4" FIPS x 3/4" MIPS $14.67 Enter a quantity and

Brass Temperature & Pressure Relief Valves

Image Description Size Material Price & Quantity
Pressure and temperature relief valve Brass Temperature and Pressure Relief Valve 3/4" FIPS x 3/4" MIPS FOR Potable Water $59.62 Enter a quantity and
3/4" FIPS x 3/4" MIPS NOT FOR Potable Water $13.95 Enter a quantity and

"The Isolator" Isolation Valves

Image Description Size Price & Quantity
Isolation valve set Isolation Valve - Set   (Hot & Cold) 
  • Complete inlet/outlet valve system that provides everything you need for a secure installation including full port testing and flushing of the system with easy to install union connections.
    2014 Federal Safe Drinking Water Act compliant
3/4" FIP Union x 3/4" FIP $100.55 Enter a quantity and
Isolation valve set Isolation Valve - Set   (Hot & Cold)  
  • Complete inlet/outlet valve system that provides everything you need for a secure installation including full port testing and flushing of the system with easy to install union connections.
    2014 Federal Safe Drinking Water Act compliant
3/4" FIP Union x 3/4" Sweat $100.35 Enter a quantity and

Gas Connectors

Image Description Size Price & Quantity
Stainless gasflex Stainless Gasflex 1" OD (3/4" ID) x 24"
with adapter to 3/4" FIP x 3/4" MIP
$36.98 Enter a quantity and
Gas ball valve Gas Ball Valve 3/4" $8.27 Enter a quantity and

Ball Valves

Image Description Size Price & Quantity
3/4inch ball valve FIP Ball Valve   3/4" FIP $13.65 Enter a quantity and
3/4inch ball valve sweat Ball Valve   3/4" Sweat $13.65 Enter a quantity and
Stainless steel nipple adapter Stainless Steel Nipple Adapter 3/4" MIP x 1-1/2" Long $4.81 Enter a quantity and
 Order 10, 50, 100 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

Flexible Corrugated Water Flexes

Image Description Material Size Length Price & Quantity
Stainless steel water heater flexes Flexible Corrugated Water Flex Stainless Steel 3/4" FIP x 3/4" FIP 18" $7.44
3/4" FIP x 3/4" FIP 24" $8.26 Enter a quantity and
Copper / Stainless Steel 3/4" FIP x 3/4" Nominal Sweat 18" $7.60
3/4" FIP x 3/4" Nominal Sweat 24" $8.33 Enter a quantity and

FloodStop Systems for Water Heaters

Features:
  • Easily prevent water damage from a leaking water heater with this unique device
  • The unit automatically shuts off water supply to the water heater and sounds an alarm leaving all other household fixtures and appliances operational
  • Provides additional protection by requiring AA batteries to be inserted to protect in case of a power outage (batteries not included)
  • Controller will operate normally without batetries installed but will continue to beep until they are inserted
  • Can easily be installed in fifteen muinutes
  • Full-port motorized ball valve (brass)
  • 2014 Federal Safe Drinking Water Act compliant
FloodStop Components:
  • Motorized Full-Port Ball Valve (3/4 inch NPT pipe threaded)
  • New Style Control Unit (with Battery Backup 4 X AA Size)
  • Water/Leak Sensor (1-1/4" X 7-1/2")
  • AC Power Adaptor (or use 4 X AA Batteries as Primary Power Source)
  • Output Contact Wires (2)

Model # Description Price & Quantity
FS 3/4-NPT-V4 Water Heater FloodStop System - 3/4" Pipe Threaded
Works with any 3/4" MIPT supply line - rated 0-180 psi
$149.97 Enter a quantity and
FS 3/4-C-V4 Water Heater FloodStop System - 3/4" Compression
Works with any 3/4" copper applications - rated 0-180 psi
$166.50 Enter a quantity and

Make sure to follow all of the manufacturer's instructions and directions by performing the proper maintenance and inspections
to ensure that you are fully protected from flooding - this is ever-so-important with (man-made) safety devices as they will eventually fail.


Related Items and Accessories



Please note: For potential safety reasons, we do not recommend using PVC to vent gas tankless water heaters. For the best results, we recommend using Category 3 stainless steel gas vent pipe for all gas tankless water heaters.



Frequently Asked Questions

Q. "What does the term "temperature rise" mean?"
A. Temperature rise is the amount the heater raises the temperature of the incoming water, based on the flow rate shown of that water.

Q. "How does a tankless heater provide hot water without a storage tank?"
A. Tankless water heaters heat on demand. The water is heated as it flows through the unit. Automated valves control water and gas flow so that your water comes out at the temperature you set it to.

Q. "What's the difference between a conventional flue and a direct vent?"
A. A conventional flue is what most people are familiar with. It typically consists of a double-wall flue pipe going from the top of the heater through the roof, venting outside. The fixture draws its combustion air from the space around it (utility room, garage, hallway, etc.). A direct-vent unit vents and draws its combustion air through a specially designed pipe from the outside via an adjacent wall.

Q. "What make a condensing tankless water heater different?"
A. Noritz condensing water heaters use a dual heat exchanger system to increase efficiency by using the residual heat from the exhaust temperature, which is captured by the first, corrosion-resistant stainless steel heat exchanger, to preheat incoming water before it runs through the main commercial grade copper heat exchanger. This reduces carbon dioxide emissions and increases efficiency. This also means vented exhaust is lower in temperature than other tankless water heater designs.

Q. "Can I use PVC to vent these tankless water heaters?"
A. The idea of using PVC venting instead of Category III stainless steel venting for condensing tankless water heaters (never recommended by the water heater manufacturer for non-condensing units) is that it will save money on venting since the exhaust temperatures are specified by the manufacturer as within the capabilities of PVC to handle safely. However, we never recommend PVC for venting. In the real world, gas water heaters are rarely maintained to their ideal, which eventually results in raised exhaust temperatures. These raised exhaust temperatures will pass beyond what PVC can safely handle and overheated PVC can release dangerous fumes and even collapse as it fails. For this reason, there is a higher incident of dangerous issues associated with PVC venting on gas tankless water heaters and we cannot, in good conscience, recommend PVC venting for gas water heaters.

Q. "How does the Water Heater Scale Inhibitor System prevent corrosion?"
A. It forms a thin protective layer on the inside of pipes and metal parts. This film or layer is microscopic in thickness and will not build up over time.

Q. "What are the best reasons to install a Scale Inhibitor System?"
A. A Scale Inhibitor System helps protect the system by reducing scale buildup and adding to the longevity and efficiency of the heater.


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