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Noritz NR501 Series - User Manual

Noritz NR501 Series
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SBB8065
Rev. 06/13
Models : NR662-OD
NR501-OD
TANKLESS GAS WATER HEATER
Owners Guide
NORITZ America Corporation
-Donotstoreorusegasolineorotherammablevaporsandliquidsinthe
vicinityofthisoranyotherappliance.
- WHAT TO DO IF YOU SMELL GAS
•Donottrytolightanyappliance.
•Donottouchanyelectricalswitch;donotuseanyphoneinyourbuilding.
•Immediatelycallyourgassupplierfromaneighborsphone.Followthe
gassuppliersinstructions.
•Ifyoucannotreachyourgassupplier,calltheredepartment.
-Installationandservicemustbeperformedbyaqualiedinstaller,service
agencyorthegassupplier.
If the information in this manual is not followed exactly, a re or explosion
may result causing property damage, personal injury, or death.
WARNING
Thank you for purchasing this Noritz Tankless Gas Water Heater.
Before using, please:
Read this manual completely for operation instructions.
Completely ll out the warranty registration card (included separately)
and mail the detachable portion to Noritz America Corporation.
Keep this manual (and the remainder of the warranty registration
card) where it can be found whenever necessary.
Installation must conform with local codes, or in the absence of
local codes, the National Fuel Gas Code, ANSI Z223.1/NFPA 54.
Noritz America reserves the right to discontinue, or change at any
time, the designs and/or specications of its products without notice.
FOR USE IN RESIDENTIAL APPLICATIONS.
*SBB8065*
Low NOx Approved
by SCAQMD
14 ng/J or 20 ppm
(Natural Gas Only)

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Questions and Answers

  • W
    Wendy HillAug 8, 2025
    What to do if there is detection of scale build-up in the heat exchanger of my Noritz NR501 Water Heater?
    • M
      meganvargasAug 8, 2025
      If there is a detection of scale build-up in the heat exchanger of your Noritz Water Heater, you need to flush the heat exchanger to remove the scale build-up.
  • B
    Belinda MorenoAug 12, 2025
    How to fix an ignition error on my Noritz NR501?
    • T
      Tanya HendricksAug 12, 2025
      If your Noritz Water Heater shows an ignition error, check if the gas valve is open. Then, try these steps: Unplug the unit or use the power button on the remote to turn it off. Open a hot water fixture, and then turn the unit back on. If the error disappears, the problem is resolved.
  • D
    David LambertAug 16, 2025
    What to do if water is cold when only a single fixture is open on my Noritz Water Heater?
    • E
      Ebony HughesAug 17, 2025
      If the water from your Noritz Water Heater is cold when only one fixture is open, increase the water flow by opening the fixture more or by opening additional fixtures. This ensures enough water passes through the unit for it to begin heating.
  • A
    Alicia NelsonAug 21, 2025
    Why doesn't the power button light come on for my Noritz NR501?
    • L
      Lisa YangAug 21, 2025
      If the power button light on your Noritz Water Heater doesn't come on, check if there has been a power failure and ensure the unit is properly connected to a power source.
  • T
    thompsonjeremyAug 26, 2025
    Why does my Noritz Water Heater stop burning during operation?
    • J
      Jeffrey HernandezAug 26, 2025
      If your Noritz Water Heater stops burning during operation, check that both the gas and water supply valves are fully open.
  • M
    Michelle WatkinsAug 29, 2025
    What to do if my Noritz NR501 Water Heater is locked due to repeated Scale Build-up error codes?
    • S
      Stacey BeasleyAug 30, 2025
      If your Noritz Water Heater unit is locked due to repeated scale build-up error codes, you must flush the heat exchanger to remove the scale build-up.
  • J
    Jason MasseySep 2, 2025
    Why doesn't my Noritz NR501 fire when water is flowing due to high supply water temperature?
    • S
      seantaylorSep 2, 2025
      Your Noritz Water Heater will not fire if the supply water temperature is too high, as the unit will overheat the outlet water.

Noritz NR501 Series Specifications

General IconGeneral
Fuel TypeNatural Gas or Propane
Heating CapacityUp to 199, 900 BTU/h
Maximum BTU Input199, 900 BTU/h
Minimum BTU Input15, 000 BTU/h
Voltage120 VAC
Frequency60 Hz
Heat Exchanger MaterialCopper
Temperature Range100°F - 140°F
TypeTankless Water Heater
WeightVaries by model
Vent TypeDirect Vent
CategoryResidential
Gas TypeNatural Gas or Propane
Input BTU/h199, 900 BTU/h
Efficiency82%
Warranty12 years heat exchanger, 5 years parts
Inlet/Outlet Connection Size3/4 inch
Gas Connection Size3/4 inch

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