NR83 Series Residential Tankless Water Heaters

by Noritz

Noritz heaters are world renowned for their efficiency and flexibility. Aside from the benefit of having an endless source of hot water, tankless water heaters save you an extra closet's worth of space compared to a tank-type water heater, and they are small and wall-mounted in comparison to those bulky water heaters. They'll also add versatility to your basement, garage, or utility room with the extra space you'll have.

Noritz NR83 Tankless Water Heaters

Noritz tankless water heater NR83 angle view
  • Steel casing with a polyester coating for strength and long lasting durability
  • Space and energy efficient - Wall-hung unit with fully modulating dual burner design precisely tracks the needs of the system
  • Designed for one to two bath homes
  • Concentric venting offers simple, single penetration installation, allowing for more installation location options
  • Eco-Burner provides reduced NOX emissions
  • Dual flame burner minimizes temperature fluctuations
  • Fully modulating design and automatic air regulator monitors internal temperature and adjusts burner according to need, providing accurate and efficient response to hot water demands
  • Add a quick-connect cable to allow two units to link together to satisfy higher flow demands
  • Direct ignition means no standby pilot light to waste energy
  • Commercial grade heat exchanger for superior durability
  • Self-diagnostic onboard computer system, combined with the included digital remote, provides ease of maintenance and temperature adjustment
  • Battery back-up compatible
  • Recirculation compatible
  • Dimensions: 23.6" (H) x 13.8" (W) x 9.4" (D)
  • View more specifications

Quick Tip: If you're replacing multiple water heaters (old tank style), you may want to order a water heater drain pump to reduce labor by quickly/easily removing the water.

Flow Rates for Noritz NR83
Temperature Rise (°F) 30 40 45 50 60 70 80 90 100
Flow Rate (GPM) 8.3 7.6 6.7 6.1 5.0 4.3 3.8 3.4 3.0

Model Number Description Natural Gas Propane
NR83-DVC Indoor Concentric Vent Tankless Water Heater $1,332.60 $1,333.64

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Complete your installation with Noritz concentric stainless steel venting!

Accessories for Noritz Tankless Water Heaters

Quick-Connect Cord

Use the Quick-Connect cord to quickly and easily connect two identical units to satisfy greater hot water demands.
Image Description Price & Quantity
Quick connect cord Quick-Connect Cord $29.60

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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 $18.29 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 $94.05 Enter a quantity and
3/4" FIPS x 3/4" MIPS NOT FOR Potable Water $7.47 Enter a quantity and

"The Isolator" Isolation Valves

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.
Image Description Size Price & Quantity
Isolation valve set Isolation Valve - Set   (Hot & Cold)  3/4" FIP Union x 3/4" FIP $121.23
Isolation valve set Isolation Valve - Set   (Hot & Cold)   3/4" FIP Union x 3/4" Sweat $122.18

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Gas Connectors

Image Description Size Price & Quantity
Plastic coated stainless steel gasflex Stainless Gasflex 1" OD (3/4" ID) x 24"
with adapter to 3/4" FIP x 3/4" MIP
Gas ball valve Gas Ball Valve 3/4" $10.18

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Ball Valves

Image Description Size Price & Quantity
3/4inch ball valve FIP Ball Valve   3/4" FIP $14.42
3/4inch ball valve sweat Ball Valve   3/4" Sweat $13.36
Stainless steel nipple adapter Stainless Steel Nipple Adapter 3/4" MIP x 1-1/2" Long $2.68

 Order 10, 50, 100 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

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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" $9.79 Enter a quantity and
3/4" FIP x 3/4" FIP 24" $11.36 Enter a quantity and
Copper / Stainless Steel 3/4" FIP x 3/4" Nominal Sweat 18" $11.14
3/4" FIP x 3/4" Nominal Sweat 24" $13.01 Enter a quantity and

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. "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. "Your products specify the 'temp. rise' based on the GPM flow; what do you mean by this?"
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. "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. "Can I use PVC to vent this tankless water heater?"
A. No. The temperature of the exhaust is too high to safely use PVC as venting material. We never recommend PVC as venting even where the ideal exhaust temperatures would technically allow it due to a much higher incident of dangerous issues associated with PVC venting on poorly-maintained gas tankless 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.

Q. "Why does this gas tankless water heater need electrical input?"
A. The Noritz gas tankless water heaters have digital output, freeze protection, and electronic ignition so it does draw a small amount of electricity.

Q. "What do you mean by commercial grade heat exchanger?"
A. This Noritz tankless hot water heater has a heat exchanger made with Type K copper piping, which is 25% thicker than the average heat exchanger in most tankless water heaters. Since the heat exchanger is what conducts the heat from the burner to the water, it is subject to a lot of stress. Having thicker copper means that the unit is more durable and will heat more water before the heat exchanger needs to be replaced. This Noritz residential tankless water heater has a 12 year limited heat exchanger warranty for residential use.

Q. "What is an Eco-Burner and how does it reduce NOX emissions?"
A. NOX emissions are produced by high temperature burns. The Noritz Eco-Burner is designed to burn at a lower temperature to reduce the NOX emissions while still efficiently producing hot water.

Q. "This is a water heater. Why would I need a battery backup?"
A. Since this tankless water heater has direct electronic ignition, power is needed to create a spark, as well as run the computer and remote. A battery backup is not required, but may be beneficial if you are in an area where there are frequent power outages as this would help provide power to your Nortiz tankless hot water heater for a short time. When choosing a battery backup, which can be purchased locally, please note it must produce a pure sine wave. Also, battery backups are only for indoor units that are plugged in as opposed to hardwired.

Q. "Will an instantaneous water heater save me money on my utility bills?"
A. In many applications you can see a savings. There are some variables that could reduce the amount you save. One example is you will not run out of hot water, so longer showers could cut into your savings. Also, the cost of electricity, propane and natural gas in your area will affect the amount of money saved. The higher the cost for the energy type used to heat your water, the quicker you can recover the higher initial cost of installing a tankless versus tank style water heater.

  • You will never run out of hot water. "You want an hour long shower? No problem!"
  • Electric units can be installed at the point of use.
  • You're not paying energy costs to heat water 24 hours a day.
  • Our electric units don't require a T&P valve (no tank!) - if code allows.
  • Installing a tankless water heater can indeed be a bonus to the environment. (Why choose wastefulness when we're talking about finite natural resources?)
  • They all need a minimum flow rate & pressure to turn on.
  • Electric units need heavy gauge wire, while gas units need a much larger, special flue pipe and larger gas supply than a conventional water heater.
  • At times they can produce very hot water. It's easier to get scalded - but this is easily mitigated with anti-scald valves.
  • With some brands, parts are hard to find (not a negative if you originally purchase from us, as we like to carry parts for the units that we sell).
Tankless water heaters have their place. They're not "the answer" to every hot water need, but if they're used correctly they can be the solution to many of them.

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