Page 1
LIGHT AND MEDIUM
WEIGHT OIL APPLICATIONS
Dimensions: in
NWHO-03
Thermostat
1" conduit
NWHO/NWHOB Series
U 3 to 10" ANSI Blind
Flange Design
U 3 to 10" Carbon Steel
Pipe Body, 150 Lb
Construction
U 3 to 120 kW
U 240 and 480V,
1 and 3 Phase
U General Purpose,
Moisture Resistant/
Explosion Resistant,
Explosion Resistant
or Moisture Resistant
Terminal Enclosure
U 0.475" Dia. Steel Sheath
Elements (20 to 23 W/in
2
U With and Without Side
Mounted AR Thermostat
(200 to 550°F)
U UL, CSA and Other Third
Party Approval, Listing
or Certification Available
APPLICATIONS
Light and Medium Weight Oil:
Tem per a ture maintenance and
heating of heat transfer oils.
Improve flow ability of medium
weight oils.
FEATURES
Terminal Enclosure:
E1 General Purpose is standard.
E2 Moisture Resistant/Explosion
Re sis tant, E3 Explosion
Resistant or E4 Moisture
Resistant En clo sures available.
Elements: 0.475" diameter steel
sheath elements.
Flange: 3 to 10" ANSI B-16.5
Blind flange with 1⁄2" thermowell
for thermostat bulb and a 1⁄8 NPT
threaded opening for a
ther mo cou ple or RTD.
opening
1" pipe
outlet
2 mtg. lugs ea.
3
with two
⁄8" -
16 x 11⁄2" deep
holes on 11⁄4"
centers
1" pipe inlet
3
⁄4 NPT
pipe plug
Note: Add 2" to A dimension for
E2 enclosure.
5
1
⁄8
6
Vessel: Pipe body and nozzles
are ASTM A53B carbon steel pipe.
The end disk is ASTM A516 Grade
70 carbon steel plate. Provided with
thermal insulation and painted sheet
metal jacket.
Wiring: Convenient field wiring
terminals are provided for easy
)
installation.
Controls: Series 3 and 6 stock
and assembly stock heaters come
equipped with side mounted
thermostat. Series 18 and 27 are
furnished without thermostat.
To Order
Ckt & Wt.
kW Volts Phase A B C Model No. lb
Series 03—3", 150 lb Carbon Steel Vessel—3 Steel Elements (23 W/in2) with Side
Mounted Thermostat—1 NPT Pipe Inlet and Outlet
3 240 1-1 3215⁄16 221⁄2 161⁄2 NWHO-03-003P-E1/240 70
3 240 1-3 3215⁄16 221⁄2 161⁄2 NWHO-03-003P-E1/240/3P 70
3 480 1-1 3215⁄16 221⁄2 161⁄2 NWHO-03-003P-E1/480 70
3 480 1-3 3215⁄16 221⁄2 161⁄2 NWHO-03-003P-E1/480/3P 70
4.5 240 1-1 3215⁄16 221⁄2 161⁄2 NWHO-03-04P5-E1/240 70
4.5 240 1-3 3215⁄16 221⁄2 161⁄2 NWHO-03-04P5-E1/240/3P 70
4.5 480 1-1 3215⁄16 221⁄2 161⁄2 NWHO-03-04P5-E1/480 70
4.5 480 1-3 3215⁄16 221⁄2 161⁄2 NWHO-03-04P5-E1/480/3P 70
6 240 1-1 4215⁄16 321⁄2 261⁄2 NWHO-03-006P-E1/240 80
6 240 1-3 4215⁄16 321⁄2 261⁄2 NWHO-03-006P-E1/240/3P 80
6 480 1-1 4215⁄16 321⁄2 261⁄2 NWHO-03-006P-E1/480 80
6 480 1-3 4215⁄16 321⁄2 261⁄2 NWHO-03-006P-E1/480/3P 80
7.5 480 1-1 557⁄16 45 39 NWHO-03-07P5-E1/480 94
7.5 480 1-3 557⁄16 45 39 NWHO-03-07P5-E1/480/3P 94
9 240 1-1 557⁄16 45 39 NWHO-03-009P-E1/240 94
9 240 1-3 55
9 480 1-1 55
9 480 1-3 55
Ordering Examples: NWHO-03-04P5-E1/480/3P, 4.5 kWt, 3-phase 480V heater.
NWHO-03-009P-E1/480, 9 kW, 1-phase 480V heater.
G-19
8
4
A
B
C
A
A
WARNING: Hazard of Fire. These
devises function as temperature
controls only. Because they do not
fail-safe, an approved temperature
and/or pressure safety control must
be used for safe operation. Consult
Controls online.
Dimensions: in
7
⁄16 45 39 NWHO-03-009P-E1/240/3P 94
7
⁄16 45 39 NWHO-03-009P-E1/480 94
7
⁄16 45 39 NWHO-03-009P-E1/480/3P 94
NWHO-03-003P-E1/240
shown smaller
than actual size.
Page 2
LIGHT AND MEDIUM
WEIGHT OIL APPLICATIONS
NWHO/NWHOB Series
Dimensions: in, NWHO-06
1" conduit
opening
2" pipe
outlet
2 mtg. lugs ea.
3
⁄8"-
with two
16 x 11⁄2" deep
holes on 11⁄4
centers
2" pipe
inlet
NWHO-18
Three 1" conduit
openings
21⁄2" pipe
outlet
2 mtg. lugs
ea. with
three 3⁄4" -
10 x 11⁄8"
deep holes
on 13⁄4"
centers
1
⁄2" pipe
2
inlet
NWHO-27
Three 1" conduit
openings
3" pipe
outlet
2 mtg. lugs
ea. with
3
⁄4" -
three
10 x 11⁄8"
deep holes
on 13⁄4"
centers
3" pipe
inlet
A
A
71⁄2
8
A
913⁄16
11
17
3
⁄8
15
A
A
⁄8
⁄4 NPT
pipe plug
C
A
A
C
(when specified)
5
1
C
25
Thermostat
13
B
Thermostat
(when
specified)
3
⁄4 NPT
pipe plug
15
⁄16
15
A
B
Thermostat
3
⁄4 NPT
pipe plug
13
⁄16
8
NWHO-18-030P-E1/240
shown smaller
than actual size.
A
B
To Order
Ckt & Wt.
kW Volts Phase A B C Model No. lb
Series 06—5", 150 lb Carbon Steel Vessel—6 Steel Elements (23 W/in2)
with Side Mounted Thermostat—2 NPT Pipe Inlet and Outlet
12 240 1-3 41
12 480 1-3 41
15 240 1-3 48
15 480 1-3 48
20 240 2-3 60
20 480 1-3 60
25 480 2-3 73
25 480 1-3 73
A
30 480 2-3 86
30 480 1-3 86
Series 18—8", 150 lb Carbon Steel Vessel—18 Steel Elements (20 W/in
21⁄2 NPT Pipe Inlet and Outlet
30 240 3-3 53
30 480 3-3 53
40 240 3-3 60
40 480 3-3 60
50 240 3-3 67
50 480 3-3 67
60 240 3-3 77
60 480 3-3 77
70 240 3-3 86
70 480 3-3 86
80 240 3-3 96
80 480 3-3 96
Series 27—10", 150 lb Carbon Steel Vessel—27 Steel Elements (20 W/in
3 NPT Pipe Inlet and Outlet
80 240 3-3 77
80 480 3-3 77
90 240 3-3 81
90 480 3-3 81
100 480 3-3 87
120 480 3-3 97
Note: Refer to the controls section for side mounted controls or control panels.
Ordering Examples: NWHO-18-060P-E1/240, 60 kW, 240V heater.
NWHO-06-012P-E1/240, 12 kW, 240V heater.
Dimensions: in
3
⁄4 30 113⁄8 NWHO-06-012P-E1/240 140
3
⁄4 30 113⁄8 NWHO-06-012P-E1/480 140
3
⁄4 37 141⁄8 NWHO-06-015P-E1/240 155
3
⁄4 37 141⁄8 NWHO-06-015P-E1/480 155
1
⁄4 481⁄2 205⁄8 NWHO-06-020P-E1/240/2C 176
1
⁄4 481⁄2 205⁄8 NWHO-06-020P-E1/480 176
5
⁄8 617⁄8 275⁄16 NWHO-06-025P-E1/480/2C 212
5
⁄8 617⁄8 275⁄16 NWHO-06-025P-E1/480 212
5
⁄8 747⁄8 337⁄8 NWHO-06-030P-E1/480/2C 240
5
⁄8 747⁄8 337⁄8 NWHO-06-030P-E1/480 240
1
⁄4 3211⁄16 293⁄16 NWHO-18-030P-E1/240 360
1
⁄4 3211⁄16 293⁄16 NWHO-18-030P-E1/480 360
1
⁄4 3911⁄16 363⁄16 NWHO-18-040P-E1/240 436
1
⁄4 3911⁄16 363⁄16 NWHO-18-040P-E1/480 436
7
⁄8 475⁄16 4313⁄16 NWHO-18-050P-E1/240 500
7
⁄8 475⁄16 4313⁄16 NWHO-18-050P-E1/480 500
3
⁄8 5613⁄16 535⁄16 NWHO-18-060P-E1/240 600
3
⁄8 5613⁄16 535⁄16 NWHO-18-060P-E1/480 600
3
⁄8 6513⁄16 625⁄16 NWHO-18-070P-E1/240 660
3
⁄8 6513⁄16 625⁄16 NWHO-18-070P-E1/480 660
3
⁄8 7513⁄16 725⁄16 NWHO-18-080P-E1/240 750
3
⁄8 7513⁄16 725⁄16 NWHO-18-080P-E1/480 750
9
⁄16 52 481⁄2 NWHO-27-080P-E1/240 720
9
⁄16 52 48-⁄2 NWHO-27-080P-E1/480 720
9
⁄16 56 521⁄2 NWHO-27-090P-E1/240 735
9
⁄16 56 521⁄2 NWHO-27-090P-E1/480 735
9
⁄16 62 581⁄2 NWHO-27-100P-E1/480 750
9
⁄16 72 681⁄2 NWHO-27-120P-E1/480 765
2
)—
2
)—
G
G-20
Page 3
LIGHT AND MEDIUM
WEIGHT OIL APPLICATIONS
NWHO/NWHOB Series
To Order
Ckt & Wt.
kW Volts Phase A B C Model No. lb
Series 18—8", 150 lb Carbon Steel Vessel—18 Baffled Steel Elements (20 W/in2)—
21⁄2 NPT Pipe Inlet and Outlet
30 240 3-3 531⁄4 3211⁄16 2913⁄16 NWHOB-18-030P-E1/240 366
30 480 3-3 53
40 240 3-3 60
40 480 3-3 60
50 240 3-3 67
50 480 3-3 67
60 240 3-3 77
60 480 3-3 77
70 240 3-3 86
70 480 3-3 86
80 240 3-3 96
80 480 3-3 96
Series 27—10", 150 lb Carbon Steel Vessel—27 Baffled Steel Elements (20 W/in
3 NPT Pipe Inlet and Outlet
80 240 3-3 77
80 480 3-3 77
90 240 3-3 81
90 480 3-3 81
100 480 3-3 87
120 480 3-3 97
Note: Refer to the controls section for side mounted controls or control panels.
Ordering Example: NWHOB-18-060P-E1/240, 60 kW, 240V heater.
Ordering
Information:
To Order—
Complete the
Model Number
using the Matrix
provided.
Model Light and Medium Weight Oil
NWHO Oil Circulation Heater
B Internal Baffles
Code Number of Elements
03 Three
06 Six
18 Eighteen
27 Twenty Seven
Code kW
003P 3 015P 15 060P 60
04P5 4.5 020P 20 070P 70
006P 6 025P 25 080P 80
07P5 7.5 030P 30 090P 90
009P 9 040P 40 100P 100
012P 12 050P 50 120P 120
Code Terminal Enclosure
E1 General Purpose
E2 Moisture Resistant/Explosion
Resistant
E3 Explosion Resistant
E4 Moisture Resistant
NWHOB 18 030P E1 Typical Model Number
Dimensions: in
1
⁄4 3211⁄16 2913⁄16 NWHOB-18-030P-E1/480 368
1
⁄4 3911⁄16 3613⁄16 NWHOB-18-040P-E1/240 442
1
⁄4 3911⁄16 3613⁄16 NWHOB-18-040P-E1/480 442
7
⁄8 475⁄16 4313⁄16 NWHOB-18-050P-E1/240 506
7
⁄8 475⁄16 4313⁄16 NWHOB-18-050P-E1/480 506
3
⁄8 5613⁄16 535⁄16 NWHOB-18-060P-E1/240 606
3
⁄8 5613⁄16 535⁄16 NWHOB-18-060P-E1/480 606
3
⁄8 6513⁄16 625⁄16 NWHOB-18-070P-E1/240 666
3
⁄8 6513⁄16 625⁄16 NWHOB-18-070P-E1/480 666
3
⁄8 7513⁄16 725⁄16 NWHOB-18-080P-E1/240 756
3
⁄8 7513⁄16 725⁄16 NWHOB-18-080P-E1/480 756
9
⁄16 52 481⁄2 NWHOB-27-080P-E1/240 726
9
⁄16 52 481⁄2 NWHOB-27-080P-E1/480 726
9
⁄16 56 521⁄2 NWHOB-27-090P-E1/240 741
9
⁄16 56 521⁄2 NWHOB-27-090P-E1/480 741
9
⁄16 62 581⁄2 NWHOB-27-100P-E1/480 756
9
⁄16 72 681⁄2 NWHOB-27-120P-E1/480 771
2
)—
Dimensions: in
NWHOB-18
Three 1" conduit
openings
1
⁄2" pipe
2
outlet
2 mtg. lugs
ea. with
three 3⁄4" -
10 x 11⁄8"
deep holes
on 13⁄4"
centers
1
2
⁄2" pipe
inlet
NWHOB-27
Three 1" conduit
openings
3" pipe
outlet
2 mtg. lugs
ea. with
3
three
⁄4" -
10 x 11⁄8"
deep holes
on 13⁄4"
centers
3" pipe
inlet
NWHOB-AA
Face of
mtg. lugs
3
3
⁄8
17
4
⁄32
3
7
⁄4
13
8
⁄16
13
A
C
A
A
11
913⁄16
17
1
A
15
C
A
A
⁄8
C
03 Series
06 Series
18 Series
27 Series
B
Thermostat
(when
specified)
3
⁄4 NPT
pipe plug
15
⁄16
15
A
B
Thermostat
(when specified)
3
⁄4 NPT
pipe plug
Pipe body
G-21
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