- gas consumption ranges from 16,000 BTUh to 199,900 BTUh

- flow rates from 0.5 gpm up to 9.8 gpm

- ANSI Z21.10.3/CSA 4.3 certified design that can be wall-mounted indoors (-SV and -DVC models only) or installed outdoors with an -OD model

- manufactured with commercial grade copper, 25% thicker piping than standard models

- available in Power Vent (-SV), Outdoor (-OD), or Concentric Direct Vent (-DVC) model that requires either 4” Category III or 5“/3” Noritz concentric stainless steel pipe

- two identical units can be linked together by using the optional Quick Connect Cord (#QC-2) for twice the hot water capacity

- 0.82 (NG) 0.88 (LP) for all NR981 Series models

- 84% efficient for use with natural gas or propane

- includes remote thermostat that can precisely adjust the output temperature from 100°F to 140°F with the capability to display temperatures in both °C and °F

- 6’ power cord is included with -SV and -DVC models (assembly required for SV models)

- Flame Sensor, Overheat Prevention Device, Lightning Protection Device, Freeze Protection

Temperature Lockout, High Elevation Adjustment, Service Reminder Function

- CSA, UPC**, NSF, Low NOx Approved by SCAQMD [<14ng/J or 20ppm],

* 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

Model NR981 SeriesResidential Tankless Water Heater

Specification Sheet

NORITZ AMERICA CORPORATION11160 Grace Avenue, Fountain Valley, CA 92708 Tel. 1-866-7NORITZ www.noritz.com

SV (Standard Vent)

OD (Outdoor Vent)

NR981 - _____

SV Model OD Model

Recess Box for OD Model (#RB-700-1)

Pipe Cover for SV/OD Model (#PC-2S)

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

DVC Model

DVC (Concentric Direct Vent)

Quick Connect Cord (#QC-2)

Pipe Cover for DVC Model (#PC-5S)

CERTIFIEDR

LOW-LEAD

Rev. 07/15

FROM BOTTOM OF CASEHEIGHT 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

TemperatureRise (°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)

Pres

sure

Loss

(psi

)

Ft o

f Hea

d

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 11.00

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 Settings100-140°F (In 5°F intervals) (9 Options)

Default Temperature Options120, 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" (

184m

m)

7.8" (

199m

m)4.9

" (12

5mm)

6.4" (

163m

m)3.1

" (79

mm)

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" (

155m

m)

5.3" (

134m

m)

2.0" (

50mm

)

6.7" (

171m

m)3.8

" (97

mm)

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