Page 1
MEDIUM, HEAVY &
FUEL OIL APPLICATIONS
NWHOR & NWHORB Series
3 to 14" ANSI Blind
Flange Design
3 to 14" Carbon Steel
Pipe Body, 150 lb
Construction
3 to 120 kW
240 and 480V,
1 & 3 Phase
General Purpose,
Moisture
Resistant/Explosion
Resistant, Explosion
Resistant or Moisture
Resistant Terminal
Enclosure
0.475" Dia. Steel Sheath
Low Watt Density
Elements (12 to 15 W/In
With & Without Side
Mounted AR Thermostat
(60 to 250°F)
UL, CSA and Other Third
Party Approval, Listing
or Certification Available
APPLICATIONS
Medium and Heavy Weight Oil:
Low watt density reduces the risk
of damaging highly viscous fluids.
Improve flow ability of fuel oils.
FEATURES
Terminal Enclosure: E1 General
Purpose is standard. E2 Moisture
Resistant/Explosion Resistant, E3
Explosion Resistant or E4 Moisture
Resistant En clo sures available.
Elements: 0.475" diameter steel
sheath elements.
Flange: 3 to 14" 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.
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
2
)
installation.
Controls: Series 03 and 06 stock
and assembly stock heaters come
equipped with side mounted
thermostat. Series 18, 27 and 45
are furnished without thermostat.
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 section of this catalog.
NWHOR-03-003P-E1/240,
$2600, shown smaller
than actual size.
Dimensions (Inches)
NWHOR-03
Thermostat
1" Conduit
Opening
8
1" Pipe
Outlet
2 Mtg. Lugs Ea.
with two 3/8" 16x1-1/2" Deep
Holes on 1-1/4"
Centers
1" Pipe Inlet
3/4" NPT
Pipe Plug
Note: Add 2" to A dimension for
E2 Enclosure.
5
6-1/8
4
A
B
C
A
A
MOST POPULAR MODELS HIGHLIGHTED!
G
To Order (Specify Model Number)
Circuit &
kW Volts Phase ABCModel No. Price (lb)
Series 03 — 3" 150 lb carbon steel vessel — 3 steel elements (15 W/In2) with side mounted thermostat —
1 NPT pipe inlet and outlet
3 240 1-1 32
3 240 1-3 32
3 480 1-1 32
3 480 1-3 32
4 240 1-1 42
4 240 1-3 42
4 480 1-1 42
4 480 1-3 42
6 240 1-1 55
6 240 1-3 55
6 480 1-1 55
6 480 1-3 55
Ordering Examples: NWHOR-03-004P-E1/240 is a 4 kW, 1 phase, 240V heater, $3000.
NWHOR-03-006P-E1/480/3P, is a 6 kW (1-3) phase, 480V heater, $3450.
Dimensions (in)
15
⁄
16
15
⁄
16
15
⁄
16
15
⁄
16
15
⁄
16
15
⁄
16
15
⁄
16
15
⁄
16
7
⁄
16
7
⁄
16
7
⁄
16
7
⁄
16
1
22
⁄
2
1
22
⁄
2
1
22
⁄
2
1
22
⁄
2
1
32
⁄
2
1
32
⁄
2
1
32
⁄
2
1
32
⁄
2
45 39 NWHOR-03-006P-E1/240 3450 94
45 39 NWHOR-03-006P-E1/240/3P 3450 94
45 39 NWHOR-03-006P-E1/480 3450 94
45 39 NWHOR-03-006P-E1/480/3P 3450 94
16
16
16
16
26
26
26
26
1
NWHOR-03-003P-E1/240 $2600 70
⁄
2
1
NWHOR-03-003P-E1/240/3P 2600 70
⁄
2
1
NWHOR-03-003P-E1/480 2600 70
⁄
2
1
NWHOR-03-003P-E1/480/3P 2600 70
⁄
2
1
NWHOR-03-004P-E1/240 3000 80
⁄
2
1
NWHOR-03-004P-E1/240/3P 3000 80
⁄
2
1
NWHOR-03-004P-E1/480 3000 80
⁄
2
1
NWHOR-03-004P-E1/480/3P 3000 80
⁄
2
G-22
Wt.
Page 2
MEDIUM, HEAVY AND FUEL OIL
APPLICATIONS
NWHOR & NWHORB Series
Dimensions (Inches)
NWHO-06
1" Conduit
Opening
8-13/16
2" Pipe
Outlet
2 Mtg. Lugs Ea.
with two 3/8"16x1-1/2" Deep
Holes on 1-1/4
Centers
2" Pipe
Inlet
NWHOR-18
(3) 1" Conduit
Openings
2-1/2" Pipe
Outlet
2 Mtg. Lugs
Ea. with
three 3/4" 10x1-1/8"
Deep Holes
on 1-3/4"
Centers
2-1/2" Pipe
Inlet
NWHOR-27
(3) 1" Conduit
Openings
3" Pipe
Outlet
2 Mtg. Lugs
Ea. with
three 3/4" 10x1-1/8"
Deep Holes
on 1-3/4"
Centers
3" Pipe
Inlet
7-1/2
A
9-13/16
11
A
A
8-5/8
15
C
A
A
17-1/8
C
25
Thermostat
3/4" NPT
Pipe Plug
C
A
A
Thermostat
specified)
Pipe Plug
15-15/16
B
Thermostat
(when specified)
3/4" NPT
Pipe Plug
B
13
B
(when
3/4" NPT
A
MOST POPULAR MODELS HIGHLIGHTED!
To Order (Specify Model Number)
Dimensions (in)
Ckt & Wt.
kW Volts Phase ABCModel No. Price (Lbs.)
Series 06 — 5", 150 lb carbon steel vessel — 6 steel elements (15 W/In2) with side
mounted thermostat — 2 NPT pipe inlet and outlet
8 240 1-3 413⁄4 30 113⁄8 NWHOR-06-012P-E1/240 $6100 140
8 480 1-3 413⁄4 30 113⁄8 NWHOR-06-012P-E1/480 6100 140
10 240 1-3 483⁄4 37 141⁄8 NWHOR-06-015P-E1/240 7000 155
10 480 1-3 483⁄4 37 141⁄8 NWHOR-06-015P-E1/480 7000 155
Series 18 — 8", 150 lb carbon steel vessel — 18 steel elements (12 W/In2) —
21⁄2 NPT pipe inlet and outlet
20 240 3-3 531⁄4 3211⁄16 293⁄16 NWHOR-18-020P-E1/240 $9950 450
20 480 3-3 531⁄4 3211⁄16 293⁄16 NWHOR-18-020P-E1/480 9950 450
25 240 3-3 601⁄4 3911⁄16 363⁄16 NWHOR-18-025P-E1/240 11,100 500
25 480 3-3 601⁄4 3911⁄16 363⁄16 NWHOR-18-025P-E1/480 11,100 500
30 240 3-3 677⁄8 475⁄16 4313⁄16 NWHOR-18-030P-E1/240 12,400 565
30 480 3-3 677⁄8 475⁄16 4313⁄16 NWHOR-18-030P-E1/480 12,400 565
35 240 3-3 773⁄8 5613⁄16 535⁄16 NWHOR-18-035P-E1/240 14,000 650
35 480 3-3 773⁄8 5613⁄16 535⁄16 NWHOR-18-035P-E1/480 14,000 650
40 240 3-3 863⁄8 6513⁄16 625⁄16 NWHOR-18-040P-E1/240 15,550 725
40 480 3-3 863⁄8 6513⁄16 625⁄16 NWHOR-18-040P-E1/480 15,550 725
45 240 3-3 963⁄8 7513⁄16 725⁄16 NWHOR-18-045P-E1/240 17,250 815
45 480 3-3 963⁄8 7513⁄16 725⁄16 NWHOR-18-045P-E1/480 17,250 815
Series 27 — 10", 150 lb carbon steel vessel — 27 steel elements (12 W/In2) —
3 NPT pipe inlet and outlet
50 240 3-3 779⁄16 52 481⁄2 NWHOR-27-050P-E1/240 $18,900 730
50 480 3-3 779⁄16 52 481⁄2 NWHOR-27-050P-E1/480 18,900 730
60 240 3-3 879⁄16 62 581⁄2 NWHOR-27-060P-E1/240 21,400 750
60 480 3-3 879⁄16 62 581⁄2 NWHOR-27-060P-E1/480 21,400 750
70 240 3-3 979⁄16 72 681⁄2 NWHOR-27-070P-E1/240 23,850 770
70 480 3-3 979⁄16 72 681⁄2 NWHOR-27-070P-E1/480 23,850 770
Series 45 — 14", 150 lb carbon steel vessel — 45 steel elements (15 W/In2) —
6" flanged pipe inlet and outlet
90 480 3-3 76 573⁄16 6611⁄16 NWHOR-45-090P-E1/480 $29,900 830
125 480 3-3 91 723⁄16 8111⁄16 NWHOR-45-125P-E1/480 36,050 960
150 480 3-3 106 873⁄16 9611⁄16 NWHOR-45-150P-E1/480 41,100 1080
175 480 3-3 121 1023⁄16 11111⁄16 NWHOR-45-175P-E1/480 46,200 1200
200 480 3-3 1281⁄2 10911⁄16 11911⁄16 NWHOR-45-200P-E1/480 50,100 1320
Ordering Example: NWHOR-18-030P-E1/240 is a 30 kW, 240 Volt Heater, $12,400.
Note — Refer to the Controls section for side mounted controls or control panels.
G-23
Page 3
HEAVY & FUEL OIL
APPLICATIONS (BAFFLED)
NWHOR & NWHORB Series
MOST POPULAR
To Order (Specify Model Number)
Ckt & Wt.
kW Volts Phase A B C Model No. Price (Lbs.)
Series 18 — 8 inch 150 lb carbon steel vessel — 18 baffled steel elements (12 W/In2) —
21⁄2" NPT pipe inlet and outlet
20 240 3-3 531⁄4 3211⁄16 293⁄16 NWHORB-18-020P-E1/240 $6611 456
20 480 3-3 531⁄4 3211⁄16 293⁄16 NWHORB-18-020P-E1/480 6611 456
25 240 3-3 601⁄4 3911⁄16 363⁄16 NWHORB-18-025P-E1/240 6686 506
25 480 3-3 601⁄4 3911⁄16 363⁄16 NWHORB-18-025P-E1/480 6686 506
30 240 3-3 677⁄8 475⁄16 4313⁄16 NWHORB-18-030P-E1/240 7064 571
30 480 3-3 677⁄8 475⁄16 4313⁄16 NWHORB-18-030P-E1/480 7064 571
35 240 3-3 773⁄8 5613⁄16 535⁄16 NWHORB-18-035P-E1/240 7795 656
35 480 3-3 773⁄8 5613⁄16 535⁄16 NWHORB-18-035P-E1/480 7795 656
40 240 3-3 863⁄8 6513⁄16 625⁄16 NWHORB-18-040P-E1/240 8522 731
40 480 3-3 863⁄8 6513⁄16 625⁄16 NWHORB-18-040P-E1/480 8522 731
45 240 3-3 963⁄8 7513⁄16 725⁄16 NWHORB-18-045P-E1/240 9035 821
45 480 3-3 963⁄8 7513⁄16 725⁄16 NWHORB-18-045P-E1/480 9035 821
Series 27 — 10 inch, 150 lb carbon steel vessel — 27 baffled steel elements (12 W/In2)
— 3" NPT pipe inlet and outlet
50 240 3-3 779⁄16 52 481⁄2 NWHORB-27-080P-E1/240 9218 736
50 480 3-3 779⁄16 52 481⁄2 NWHORB-27-080P-E1/480 9218 736
60 240 3-3 879⁄16 62 581⁄2 NWHORB-27-090P-E1/240 9781 756
60 480 3-3 879⁄16 62 581⁄2 NWHORB-27-090P-E1/480 9781 756
70 240 3-3 979⁄16 72 681⁄2 NWHORB-27-100P-E1/240 10,972 776
70 480 3-3 97
Ordering Example: NWHORB-18-035P-E1/240 is a 35 kW, 240 Volt Heater, $7795.
Note — Refer to the Controls section for side mounted controls or control panels.
Ordering
Information
To Order —
Complete the
Model
Model Medium, Heavy and Fuel Oil
NWHO Oil Circulation Heater
R Low Watt Density Elements
B Internal Baffles
Code Number of Elements
Number using
the Matrix
06 Six 45 Forty Five
provided.
Code kW
003P 3 020P 20 060P 60
004P 4 025P 25 070P 70
006P 6 030P 30 090P 90
008P 8 035P 35 125P 125
010P 10 040P 40 150P 150
012P 12 045P 45 175P 175
015P 15 050P 50 200P 200
018P 18
Code Terminal Enclosure
E1 General Purpose
E2 Moisture Resistant/Explosion
Resistant
E3 Explosion Resistant
E4 Moisture Resistant
NWHORB 18 030P E1 Typical Model Number
Dimensions (In.)
9
⁄16 72 681⁄2 NWHORB-27-120P-E1/480 10,972 776
03 Three 27 Twenty Seven
18 Eighteen
ITEMS HIGHLIGHTED
Dimensions (Inches)
NWHOR-45
15
18-13/16
6" Outlet
B
6" Inlet
NWHORB-18
(3) 1" Conduit
Openings
2-1/2" Pipe
Outlet
2 Mtg. Lugs
Ea. with
three 3/4" 10x1-1/8"
Deep Holes
on 1-3/4"
Centers
2-1/2" Pipe
Inlet
NWHORB-27
(3) 1" Conduit
Openings
3" Pipe
Outlet
2 Mtg. Lugs
Ea. with
three 3/4" 10x1-1/8"
Deep Holes
on 1-3/4"
Centers
3" Pipe
Inlet
NWHOR-AA
Face of
Mtg. Lugs
A
9-13/16
11
17-1/8
11-1/2
C
A
A
15
C
Thermostat
specified)
3/4" NPT Pipe Plug
C
L
Mtg. Lug
Centers
Thermostat
specified)
Pipe Plug
13
B
(when
Pipe Body
C
13
B
(when
3/4" NPT
A
A
G
A
G-24
3-3/8
4-17/32
7-3/
8-13/16
03 Series
06 Series
18 Series
27 Series
Page 4
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