Noritz NR501-OD User Manual
Model NR501 Series
Residential Tankless Water Heater
Specification Sheet
• Standard Input- Gas consumption ranges from 15,000 BTUh 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
wall-mounted outdoors.
• Durable Steel Casing with Polyester Coating
• No Venting Required - Outdoor (-OD) model does not require any additional
vent pieces
• Energy Factor- 0.86(NG) 0.85(LP)
• Thermal Efficiency - 84% 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, Lighting Protection
Device, Freeze Protection, Fan Rotation Detector
OD Model
• Additional Features - Temperature Lockout, High Elevation Adjustment, Built-in
display window
• 12-Year** Limited Heat Exchanger Warranty for Standard Residential Use
• 5-Year Limited Parts Warranty
• 1-Year Reasonable Labor Warranty
• Approvals- CSA (US Only), UPC***, NSF, Low NOx - Complies with SCAQMD Rule
1146.2 (14 ng/J or 20ppm) low NOx regulations.
LOW-LEAD
NR501 - OD
Isolation Valves (#IK-WV-200-1(-LF))
Outdoor Recess Box (#RB-510)
Remote Controller (#RC-7651M)
Remote Controller Cord (#RC-CORD10)
Remote Controller Cord (#RC-CORD26)
Pipe Cover (#PC-1S)
*Optional remote thermostat can adjust temperature from 115°F - 160°F in 5°F intervals
**12 Years replacement on the heat exchanger when the product is used in a single family dwelling. 3 Years replacement on heat exchanger when the product is used for commercial
capacity, if it is used in other than a single family dwelling, or if the product is supplied with pre-heated or circulated water (an aquastat being the minimum pump control
requirement). 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.
NORITZ AMERICA CORPORATION
11160 Grace Avenue, Fount ain Valley, CA 92708 Tel. 1-866-7NORITZ www.noritz.com
Dimensions
0.4" (10mm)
1.2" (31mm)
19.2" (487mm)
0.4" (10mm)
SIDE VIEW
6.7" (170mm)
1.6" (40mm)
1.1" (27mm)
0.4" (11mm)
AIR INLET
5.2" (133mm)
WATER DRAIN VALVE
(WATER FILTER)
HOT WATER OUTLET
WATER DRAIN VALVE
Temperature
Rise (°F)
Flow Rate
(GPM)
13.8" (350mm)
13.1" (334mm)
7.0" (178mm)
20.5" (520mm)
COLD WATER INLET
2.9" (73mm)
AIR INLET
DISPLAY WINDOW
FRONT VIEW
WIRING THROUGHWAY
WIRING THROUGHWAY
(AC120V)
GAS INLET
2.2" (57mm)
1.7" (42mm)
5.5" (139mm)
1.4" (36mm)
HOT WATER OUTLET
COLD WATER INLET
HEIGHT OF EACH FITTING
FROM BOTTOM OF CASE
HOT WATER OUTLET 1.8" (45mm)
COLD WATER INLET
GAS INLET
(VIEW FROM TOP)
3.2" (80mm)
1.6" (40mm)
BOTTOM VIEW
Flow Rates
30 40 45 50 60 70 80 90 100
5.0 5.0 4.2 3.9 3.3 2.8 2.5 2.2 2.0
11.7" (296mm)
9.9" (252mm)
8.2" (208mm)
GAS INLET
1.8" (45mm)
3.8" (97mm)
1.6" (40mm)
WIRING THROUGHWAY
(AC120V)
WIRING THROUGHWAY
(NR501-OD)
1.9" (49mm)
2.0" (50mm)
30
25
20
15
Pressure loss [psi]
10
5
0
0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
Model Name
Weight
Water Holding Capacity
Connection
Sizes
Power
Water Inlet
Hot Water Outlet
Gas Inlet
Supply
Consumption
Freeze Protection
Temperature Settings with
Optional Remote Controller
Default Temperature Options
°F Mode
°C Mode
°F Mode
°C Mode
Pressure Loss Characteristics
Flow rate [GPM]
Specifications
NR501-OD
p
32 (
ounds)
0.15 Gallon (0.5 L)
3/4"
3/4"
1/2"
120VAC (6 0Hz), less than 4 amperes
NG: 35W LP: 38W Free ze Preventi on 138W
Outdoor: -4
115-140°F (In 5°F intervals) (6 Options)
46-48°C (In 1°C intervals), 50, 55, 60°C (In 5°C intervals) (6 Options)
120, 130, 135, 140°F (Default is 120°F)
50, 54, 57, 60°C (Default is 50°C)
°F
60
50
40
30
Pressure loss [Ft. of head]
20
10
0
ut notice.
Rev.
07/15
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