Specification Sheet

Rev. 01/2018
ut notice.
Specifications
Water Inlet
Hot Water Outlet
Supply
Temperature Settings with
115-140°F (In 5°F intervals) (6 Options)
Default Temperature Options
120, 130, 135, 140°F (Default is 120°F)
Connection
Sizes
Weight
Water Holding Capacity
Power
Model Name
Freeze Protection
46-48°C (In 1°C intervals), 50, 55, 60°C (In 5°C intervals) (6 Options)
°F Mode
°C Mode
°F Mode
°C Mode
50, 54, 57, 60°C (Default is 50°C)
Gas Inlet
32 (
p
ounds)
0.15 Gallon (0.5 L)
3/4"
3/4"
120VAC (60Hz), less than 4 amperes
NG: 35W LP: 38W Freeze Prevention 138W
NR501-OD
Outdoor: -4 °F
1/2"
Dimensions
SIDE VIEW
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
Temperature
Rise (°F)
Flow Rate
(GPM)
Flow Rates
Optional Remote Controller
HEIGHT OF EACH FITTING
FROM BOTTOM OF CASE
FRONT VIEW
BOTTOM VIEW
Pressure Loss Characteristics
Consumption
13.1" (334mm)
13.8" (350mm)
1.7" (42mm)
2.2" (57mm)
20.5" (520mm)
7.0" (178mm)
2.9" (73mm)
AIR INLET
DISPLAY WINDOW
6.7" (170mm)
0.4" (11mm)
0.4" (10mm)
0.4" (10mm)
5.2" (133mm)
1.1" (27mm)
1.6" (40mm)
AIR INLET
19.2" (487mm)
1.2" (31mm)
(NR501-OD)
HOT WATER OUTLET 1.8" (45mm)
COLD WATER INLET
1.9" (49mm)
GAS INLET
2.0" (50mm)
COLD WATER INLET
HOT WATER OUTLET
WATER DRAIN VALVE
WIRING THROUGHWAY
GAS INLET
(AC120V)
WIRING THROUGHWAY
(WATER FILTER)
WATER DRAIN VALVE
1.6" (40mm)
3.2" (80mm)
1.8" (45mm) 3.8" (97mm) 1.6" (40mm)
1.4" (36mm)
5.5" (139mm)
8.2" (208mm)
9.9" (252mm)
11.7" (296mm)
WIRING THROUGHWAY
(AC120V)
WIRING THROUGHWAY
GAS INLET
COLD WATER INLET
(VIEW FROM TOP)
HOT WATER OUTLET
0
5
10
15
20
25
30
0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
Flow rate [GPM]
Pressure loss [psi]
0
10
20
30
40
50
60
Pressure loss [Ft. of head]