Model NR501 Series Residential Tankless Water Heater Specification
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 OD Model
standard temperature settings* - Flame Sensor, Overheat Prevention Device, Lightning Protection Device, Freeze Protection, Fan Rotation Detector Additional Features - Temperature Lockout, High Elevation Adjustment, Built-in display window
NR501 - OD
12-Year** Limited Heat Exchanger Warranty for Residential Use 5-Year Limited Parts Warranty 1-Year Reasonable Labor Warranty
Isolation Valves (#IK-WV-200-1(-LF)) Outdoor Recess Box (#RB-510) Remote Controller (#RC-7651M)
Approvals - CSA (US Only), UPC***, NSF, Low NOx - Complies with SCAQMD Rule 1146.2 (14 ng/J or 20 ppm) low NOx regulations.
Remote Controller Cord (#RC-CORD10) Remote Controller Cord (#RC-CORD26) Pipe Cover (#PC-1S)
LOW-LEAD
* Optional remote thermostat can adjust temperature from 115 °F-160°F in 5 °F intervals ** Heat Exchanger warranty is maintained at 12 years or 6500 operational hours, whichever occurs first, when used in a single family dwelling in conjunction with a controlled recirculation system (an aquastat being the minimum pump control requirement) in accordance with the Installation Manual. 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, Fountain Valley, CA 92708 Tel. 1-866-7NORITZ www.noritz.com
Dimensions (VIEW FROM TOP)
5.5" (139mm) 1.4" (36mm)
5.2" (133mm)
3.2" (80mm) 1.6" (40mm)
GAS INLET
HOT WATER OUTLET
WIRING THROUGHWAY (AC120V)
COLD WATER INLET
DISPLAY WINDOW
AIR INLET
0.4" (10mm)
9.9" (252mm) 8.2" (208mm)
1.6" (40mm) 1.8" (45mm) 3.8" (97mm)
AIR INLET
11.7" (296mm)
2.2" (57mm)
2.9" (73mm)
20.5" (520mm)
19.2" (487mm)
13.8" (350mm) 13.1" (334mm) 7.0" (178mm)
1.7" (42mm)
6.7" (170mm) 1.6" (40mm) 1.1" (27mm) 0.4" (11mm)
1.2" (31mm)
0.4" (10mm)
WIRING THROUGHWAY
HEIGHT OF EACH FITTING FROM BOTTOM OF CASE
FRONT VIEW
SIDE VIEW COLD WATER INLET
WATER DRAIN VALVE (WATER FILTER)
(NR501-OD)
WIRING THROUGHWAY
HOT WATER OUTLET
WIRING THROUGHWAY (AC120V)
WATER DRAIN VALVE
HOT WATER OUTLET
1.8" (45mm)
COLD WATER INLET
1.9" (49mm)
GAS INLET
2.0" (50mm)
GAS INLET
BOTTOM VIEW
Flow Rates Temperature Rise (°F) Flow Rate (GPM)
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
Pressure Loss Characteristics 30
Pressure loss [psi]
50 20 40 15 30 10
Pressure loss [Ft. of head]
60
25
20
5
0 0.0
10
0 1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
Flow rate [GPM]
Specifications Model Name
NR501-OD 32 (pounds)
Weight Water Holding Capacity
0.15 Gallon (0.5 L) 3/4"
Water Inlet Connection Hot Water Outlet Sizes Gas Inlet Power
3/4" 1/2"
Supply
120VAC (60Hz), less than 4 amperes
Consumption
NG: 35W LP: 38W Freeze Prevention 138W Outdoor: -4°F
Freeze Protection Temperature Settings with Optional Remote Controller Default Temperature Options
°F Mode
115-140°F (In 5°F intervals) (6 Options)
°C Mode
46-48°C (In 1°C intervals), 50, 55, 60°C (In 5°C intervals) (6 Options)
°F Mode °C Mode
120, 130, 135, 140°F (Default is 120°F) 50, 54, 57, 60°C (Default is 50°C)
ut notice.
Rev. 7/13
standard temperature settings* - Flame Sensor, Overheat Prevention Device, Lightning Protection Device, Freeze Protection, Fan Rotation Detector Additional Features - Temperature Lockout, High Elevation Adjustment, Built-in display window
NR501 - OD
12-Year** Limited Heat Exchanger Warranty for Residential Use 5-Year Limited Parts Warranty 1-Year Reasonable Labor Warranty
Isolation Valves (#IK-WV-200-1(-LF)) Outdoor Recess Box (#RB-510) Remote Controller (#RC-7651M)
Approvals - CSA (US Only), UPC***, NSF, Low NOx - Complies with SCAQMD Rule 1146.2 (14 ng/J or 20 ppm) low NOx regulations.
Remote Controller Cord (#RC-CORD10) Remote Controller Cord (#RC-CORD26) Pipe Cover (#PC-1S)
LOW-LEAD
* Optional remote thermostat can adjust temperature from 115 °F-160°F in 5 °F intervals ** Heat Exchanger warranty is maintained at 12 years or 6500 operational hours, whichever occurs first, when used in a single family dwelling in conjunction with a controlled recirculation system (an aquastat being the minimum pump control requirement) in accordance with the Installation Manual. 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, Fountain Valley, CA 92708 Tel. 1-866-7NORITZ www.noritz.com
Dimensions (VIEW FROM TOP)
5.5" (139mm) 1.4" (36mm)
5.2" (133mm)
3.2" (80mm) 1.6" (40mm)
GAS INLET
HOT WATER OUTLET
WIRING THROUGHWAY (AC120V)
COLD WATER INLET
DISPLAY WINDOW
AIR INLET
0.4" (10mm)
9.9" (252mm) 8.2" (208mm)
1.6" (40mm) 1.8" (45mm) 3.8" (97mm)
AIR INLET
11.7" (296mm)
2.2" (57mm)
2.9" (73mm)
20.5" (520mm)
19.2" (487mm)
13.8" (350mm) 13.1" (334mm) 7.0" (178mm)
1.7" (42mm)
6.7" (170mm) 1.6" (40mm) 1.1" (27mm) 0.4" (11mm)
1.2" (31mm)
0.4" (10mm)
WIRING THROUGHWAY
HEIGHT OF EACH FITTING FROM BOTTOM OF CASE
FRONT VIEW
SIDE VIEW COLD WATER INLET
WATER DRAIN VALVE (WATER FILTER)
(NR501-OD)
WIRING THROUGHWAY
HOT WATER OUTLET
WIRING THROUGHWAY (AC120V)
WATER DRAIN VALVE
HOT WATER OUTLET
1.8" (45mm)
COLD WATER INLET
1.9" (49mm)
GAS INLET
2.0" (50mm)
GAS INLET
BOTTOM VIEW
Flow Rates Temperature Rise (°F) Flow Rate (GPM)
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
Pressure Loss Characteristics 30
Pressure loss [psi]
50 20 40 15 30 10
Pressure loss [Ft. of head]
60
25
20
5
0 0.0
10
0 1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
Flow rate [GPM]
Specifications Model Name
NR501-OD 32 (pounds)
Weight Water Holding Capacity
0.15 Gallon (0.5 L) 3/4"
Water Inlet Connection Hot Water Outlet Sizes Gas Inlet Power
3/4" 1/2"
Supply
120VAC (60Hz), less than 4 amperes
Consumption
NG: 35W LP: 38W Freeze Prevention 138W Outdoor: -4°F
Freeze Protection Temperature Settings with Optional Remote Controller Default Temperature Options
°F Mode
115-140°F (In 5°F intervals) (6 Options)
°C Mode
46-48°C (In 1°C intervals), 50, 55, 60°C (In 5°C intervals) (6 Options)
°F Mode °C Mode
120, 130, 135, 140°F (Default is 120°F) 50, 54, 57, 60°C (Default is 50°C)
ut notice.
Rev. 7/13
