Specification Sheet

Rev. 07/15
FROM BOTTOM OF CASE
HEIGHT OF EACH FITTING
2.2"GAS INLET
2.2"COLD WATER INLET
1.8"HOT WATER OUTLET
NR981 Series
Specifications
ut notice.
Dimensions
OD Model
Pressure Loss
30 40 45 50 60 70 80 90 100
9.8 8.4 7.5 6.7 5.6 4.8 4.2 3.7 3.4
Temperature
Rise (°F)
Flow Rate
(GPM)
Flow Rates
BOTTOM VIEW
SIDE VIEW
FLUE COLLAR
AIR INLET
5.0"
3.1"
13.1"
13.8"
DVC Model
GAS INLET
WIRING THROUGHWAY
WATER DRAIN VALVE
(WATER FILTER)
HOT WATER OUTLET
WATER DRAIN VALVE
COLD WATER INLET
(120VAC)
WIRING THROUGHWAY
1.6"
3.7"
22.3"
2.8"
0.4"
9.4"
0.4"
1.1"
AIR INLET
13.8"
1.7” 3.4"
9.9"
2.4"
13.1"
Flow Rate (gpm)
Pressure Loss (psi)
Ft of Head
4.8"
1.1"
11.1"
0.4" - 1.8"
DVC Model
FLUE COLLAR
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 9.0 10.0 11.0
0
10
20
30
40
50
60
Set temperature:
125°F or higher
Set temperature:
120°F or less
Water Inlet
Hot Water Outlet
Supply
NG: 65W LP: 67W Freeze Prevention 161WConsumption
Temperature Settings
100-140°F (In 5°F intervals) (9 Options)
Default Temperature Options
120, 135, 140°F (Default is 120°F)
Connection
Sizes
Weight
Water Holding Capacity
Power
Model Name
NR981-OD
Freeze Protection Outdoor: -4 °F
37-48°C (In 1°C intervals), 50, 55, 60°C (In 5°C intervals) (15 Options)
°F Mode
°C Mode
°F Mode
°C Mode
50, 57, 60°C (Default is 50°C)
Gas Inlet
54 (pounds)
0.5 Gallon (1.8 L)
3/4"
3/4"
120VAC (60Hz), less than 2 amperes
NG: 65W LP: 69W Freeze Prevention 193W
NR981-SV
Indoor: -30 °F
3/4"
58 (pounds)
NG: 80W LP: 83W Freeze Prevention 193W
NR981-DVC
Indoor: -30 °F
7.2" (184mm) 7.8" (199mm) 4.9" (125mm) 6.4" (163mm)
3.1" (79mm)
9.5" (241mm)
2.4" (60mm)
1.4" (36mm)
(VIEW FROM TOP)
HOT WATER OUTLET (3/4")
WIRING THROUGHWAY
COLD WATER INLET (3/4”)
GAS INLET (3/4")
WIRING THROUGHWAY
(AC120V)
5.7" (146mm)
10.3" (262mm)
9.5" (241mm)
1.4" (36mm)
2.4" (60mm)
6.1" (155mm) 5.3" (134mm)
2.0" (50mm) 6.7" (171mm) 3.8" (97mm)
HOT WATER OUTLET (3/4")
WIRING THROUGHWAY
COLD WATER INLET (3/4")
GAS INLET (3/4")
WIRING THROUGHWAY
(AC120V)
5.7" (146mm)
10.3" (262mm)
DVC Model
SV and OD Models
0.2 Gallon (1.0 L)
Operating Pressure
Gas Supply Pressure
NG: 4.0” - 10.5” LP: 8.0” - 14.0”
15 - 150 psi
FRONT VIEW
13.8"
23.6"
13.1"
AIR INLET
4"
FLUE COLLAR