Noritz NR50-OD User Manual

Model NR50 Series

Residential Tankless Water Heater

Specification Sheet

• Standard Input - gas consumption ranges from 19,000 BTUh (NG)
and 20,000 BTUh (LPG) up to 120,000 BTUh

• Capacity Range - flow rates from 0.5 gpm up to 5.0 gpm

• Compact Design - ANSI Z21.10.3/CSA 4.3 certified design that can

be installed outdoors

• Durable Steel Casing with Polyester Coating

• No Venting Required - Outdoor (-OD) model does not require any

additional stainless steel venting

• Direct Electronic Ignition

• Energy Factor - 0.82 for NG and LP

• Thermal Efficiency - 83% efficient for use with natural gas or propane

• Temperature Controls - includes 120°F (default), 130°F, 135°F, or 140°F

standard temperature settings*

• Safety Devices - Flame Sensor, Overheat Prevention Device, Lightning
Protection Device

• Additional Features - Temperature Lockout, Flow Meter Alarm, Optional
Freeze Protection

• 12-Year** Limited Heat Exchanger Warranty for Residential Use

• 5-Year Limited Parts Warranty

• 1-Year Reasonable Labor

• Approvals - CSA (US only), UPC***, NSF, Low NOx Compliant with Jurisdictions

Requiring <40 ng/J or 55ppm, Suitable for Installation in a Manufactured
(Mobile) Home ****

LOW-LEAD

NR50-OD

Model

NR50 - OD

Accessories

Remote Controller (#RC-7649M)

Remote Controller Cord (#RC-CORD10)

Pipe Cover (#PC-1S)

Isolator Valves (#IK-WV-200-1)

Recess Box for OD Model (#RB-500)

Freeze Protection Kit (#SKG7772)

* Optional remote thermostat can precisely adjust the output temperature from 100°F to 160°F in 5°F intervals
** 3-Year Heat Exchanger warranty if supplied with pre-heated or circulated water, refer to the Noritz Limited Warranty for complete coverage details
*** This product complies with California AB 1953 Low Lead Law and section 1417(d) of the Safe Drinking Water Act
**** Manufactured (Mobile) Home approval is valid for OD models only

NORITZ AMERICA CORPORATION

11160 Grace Avenue, Fountain Valley, CA 92708 Tel. 1-866-7NORITZ www.noritz.com

Dimensions

FLUE TERMINAL

WATER DRAIN VALVE

(WATER FILTER)

HOT WATER OUTLET

WATER DRAIN VALVE

Temperature
Rise (°F)

Flow Rate
(GPM)

5.0 5.0 4.2 3.9 3.3 2.8 2.5 2.2 2.0

13.8"

13.1"

0.4" 6.7"

1.0"

1.2"

1.7"

20.5"
AIR INLET

COLD WATER INLET

GAS INLET

WIRING THROUGHWAYS

19.2"

0.4"

HEIGHT OF EACH FITTING
FROM BOTTOM OF CASE

HOT WATER OUTLET

GAS INLET

AIR INLET

NR50-OD

1.8"

1.9"COLD WATER INLET

2.0"

BOTTOM VIEW

Flow Rates

30 40 45 50 60 70 80 90 100

Pressure Loss

20

40

15

30

10

5

Pressure Loss (PSI)

0

0.0 1.0 2.0 3.0 4.0 5.0 6.0

Flow Rate (GPM)

20

10

0

Specifications

Model Name
Weight
Water Holding Capacity

Connection
Sizes

Power

Consumption NG: 36W LP: 39W Freeze Prevention (optional) 141W

120VAC (60Hz), less than 2 amperesSupply

100-150°F (In 5°F intervals), 160°F (12 Options)Temperature Settings

Default Temperature Options 120, 130, 135, 140°F (Default is 120°F)

NR50-OD

33 (pounds)

0.2 Gallon
3/4"Water Inlet
3/4"Hot Water Outlet
1/2"Gas Inlet

Ft of Head

ut notice.

Rev. 07/15