W A T L O W
Tubular and
Process Assemblies
Screw Plug
Immersion Heaters
Screw plug immersion heaters are
ideal for direct immersion heating of
liquids, including all types of oils and
heat transfer solutions.
Available in a variety of stock and
made-to-order sizes, Watlow screw
plug immersion heaters feature both
WATROD round and FIREBAR®flat
tubular elements.
Heating elements are hairpin bent
and either welded or brazed into the
screw plug—depending on element
sheath and plug material
compatibility.
General purpose (NEMA 1) terminal
enclosures are standard; with
optional moisture resistant
(NEMA 4), explosion resistant
(NEMA 7) and explosion/moisture
resistant (NEMA 7/4) enclosures
available to meet specific
application needs.
Optional thermostats provide
convenient process temperature
regulation.
Performance Capabilities
• Watt densities to 120 W/in
(18.6 W/cm2)
• Wattages to 38kW
• UL®and CSA component
recognition to 480VÅ(ac) and
600VÅ(ac) respectively
• Incoloy®sheath temperatures to
1600°F (870°C)
• Passivated 316 stainless steel
sheath temperatures to 1200°F
(650°C)
• 304 stainless steel sheath
temperatures to 1200°F (650°C)
• Steel sheath temperatures to
750°F (400°C)
• Copper sheath temperatures to
350°F (175°C)
Incoloy®is a registered trademark of
Special Metals Corporation.
®
is a registered trademark of
UL
Underwriter's Laboratories, Inc.
2
Features and Benefits
• Screw plug and element sizes:
1" NPT 0.315" WATROD
1
1
⁄4" NPT 0.315" WATROD
1" FIREBAR
2" NPT 0.475" WATROD
21⁄2" NPT 0.475" WATROD
1" FIREBAR
• A variety of element sheath and
screw plug materials to meet
application needs.
• Integral thermowells provide
convenient temperature sensor
insertion and replacement without
draining the fluid being heated.
• Terminal enclosures can be
rotated to simplify connection with
existing conduits.
On stock chart units:
• Same day on most heaters
• 10 working days on special voltages
and/or wattages
• 15 working days on special element lengths
NPT
Pipe
Thread
Half
Coupling
Weld
WATROD Heating Element
FIREBAR
Heating
Element
• Welding or brazing WATROD
and FIREBAR elements to the
screw plug provides a pressure
tight seal.
• WATROD hairpins are
repressed (recompacted) to
maintain MgO density, dielectric
strength, heat transfer and life.
• 21⁄2" NPT screw plug assemblies
feature element support(s) to
help ensure proper spacing for
maximizing heater performance
and life.
• Phase capability:
1" NPT 1-Phase
11⁄4", 2", 21⁄2" NPT 1- or 3-Phase
• UL®and CSA component
recognition under file numbers
E52951 and 31388 respectively.
See pages 268-271 for details.
321
Screw Plug
Tubular and
View A-A
Thermowell
Element
Bundle
A
A
View A-A
Thermowell
Element
Bundle
A
A
View A-A
Thermowell
Element
Bundle
A
A
View A-A
Thermowell
Element
Bundle
A
A
View A-A
Thermowell
Element
Bundle
A
A
Process Assemblies
Screw Plug
Immersion Heaters
Screw Plug Orientation
Correct element/thermowell
orientation assures proper process
temperature sensing.
Correct horizontal mounting of
WATROD and FIREBAR screw plugs
is shown to the right. Correct
orientation assures optimum
performance and maximum heater
life. Additional mounting information
is provided in the Installation and
Maintenance Instructions.
Applications
• Water:
Deionized
Demineralized
Clean
Potable
Process
• Industrial water rinse tanks
• Vapor degreasers
• Hydraulic oil, crude, asphalt
• Lubricating oils at API specified
watt densities
• Air and gas flow
• Caustic solutions
• Chemical baths
• Anti-freeze (glycol) solutions
• Paraffin
FIREBAR Heating Element
11⁄4" NPT–One Element 21⁄2" NPT–Three Elements
WATROD Heating Element
1" NPT–One Element
Options
Terminal Enclosures
General purpose (NEMA 1) terminal
enclosures, without thermostats, are
standard on all screw plug
immersion heaters. To meet specific
application requirements, Watlow
offers the following optional terminal
enclosures:
• General purpose (NEMA 1) with
single or double pole thermostat
11⁄4" & 2" NPT–Two Elements 2" & 21⁄2" NPT–Three Elements
• Moisture resistant (NEMA 4) or
corrosion resistant (NEMA 4X) —
available with optional single or
double pole thermostat
• Explosion resistant (NEMA 7)
class 1, groups C and D
explosion resistant—available
with optional single or double pole
thermostat. For class 1, group B
enclosures, consult your Watlow
representative or refer to CSA
specifications on page 271.
• Explosion/moisture resistant
available with optional single or
double pole thermostat
Note: Unless otherwise stated on
the accompanying illustrations,
both WATROD and FIREBAR
screw plugs are centered on the
terminal enclosure. To order, add
the suffix letter(s) to the screw
plug heater’s base code number.
This is depicted on the Stock and
Options ordering example on
page 336. Also, specify class and
group, if applicable.
(NEMA 7/4) combination—
322
W A T L O W
3
13
/
16
"
(97 mm)
3
/
4
"
Conduit Opening
4
5
/
8
"
(117 mm
)
4
"
(100 mm)
3
/
4
"
Conduit Opening
5
1
/
2
"
(140 mm)
4
1
/2
"
(114 mm)
2
5
/8
"
(67 mm)
1
5
/16
"
(33 mm)
1
7
/16
"
(37 mm)
2
7
/8
"
(73 mm) Ref.
(1) 1.093
"
(28 mm)
Dia. Hole
2
"
(51 mm)
2
"
(50 mm)
3
/4
"
Conduit
Opening
4
"
(100 mm)
13
/16
"
(21 mm)
6
9
/
16
"
6
9
/
16
"
(167 mm)
4
1
/
4
"
(108 mm)
6
"
(152 mm)
3
13
/16
"
(97 mm)
4
3
/8
"
(111 mm)
1
3
/8
"
(35 mm)
2
1
/2
"
(64 mm)
Dia.
6
1
/4
"
(159 mm)
5
3
/4
"
(146 mm)
1
1
/2
"
Conduit Opening
2
9
/16
"
(65 mm)
21
/32
"
(17 mm)
3
1
/16
"
(78 mm)
3
3
/4
"
(95 mm)
3
/4
"
Conduit Opening
Tubular and
Process Assemblies
Screw Plug
Immersion Heaters
Options
Continued
General Pupose (NEMA 1)
Single Pole Thermostat
All screw plug sizes
Double Pole Thermostat
All screw plug sizes
Caution:
Explosion-resistant terminal
enclosures are intended to provide
explosion containment in
the electrical termination/wiring
enclosure only. No portion of the
assembly outside of this enclosure
is covered under this NEMA rating.
NEMA rating effectiveness may
be compromised by abuse or
misapplication.
Moisture Resistant NEMA 4
Without Thermostat
All screw plug sizes
Single Pole Thermostat
1" & 11⁄4 " NPT–1 WATROD Element
Single or Double Pole Thermostat
11⁄4 " NPT–2 WATROD Elements
11⁄4 " NPT–1 FIREBAR Element
All 2" & 2 1⁄2 " NPT screw plugs
Note: The thermostat is not centered on the
WATROD screw plug immersion heater.
Note: The thermostat is not centered on the
screw plug immersion heater.
Explosion/Moisture Resistant (NEMA 7 or 7/4)
Without Thermostat
All WATROD screw plugs
Single or Double Pole Thermostat
11⁄4 " NPT–1 FIREBAR Element
All WATROD screw plugs
Screw Plug
➀
➀ All NEMA 7/4 rated terminal enclosures supplied with a gasket for the cover.
323
Tubular and
3
1
/8
"
(79 mm)
3
5
/16
"
(84 mm)
3
1
/2
"
(89 mm)
O.D.
5
"
(127 mm)
4
1
/2
"
(114 mm)
1
5
/32
"
(29 mm)
1
1
/4
"
Conduit Opening
2
9
/16
"
(65 mm)
3
1
/16
"
(77 mm)
21
/32
"
(17 mm)
2
1
/2
"
(64 mm)
O.D.
4
3
/4
"
(121 mm)
3
3
/4
"
(95 mm)
3
/4
" Conduit
Opening
3
13
/16
"
(97 mm)
4
3
/8
"
(111 mm)
3
1
/2
"
(89 mm)
O.D.
6
3
/8
"
(162 mm)
5
3
/4
"
(146 mm)
1
3
/8
"
(35 mm)
1
1
/2
"
Conduit Opening
Process Assemblies
Screw Plug
Immersion Heaters
Options
Continued
Explosion/Moisture Resistant (NEMA 7 or 7/4)
Without Thermostat
11⁄4 " NPT––1 FIREBAR element
➀
All NEMA 7/4 rated terminal enclosures supplied with a gasket for the cover.
Without Thermostat
21⁄2 " NPT–3 FIREBAR elements
➀
CSA Certified Enclosures
CSA certified moisture and/or
explosion resistant terminal
enclosures protect wiring in
hazardous gas environments. These
terminal enclosures, covered under
CSA file number 61707, are
available on all WATROD and
FIREBAR screw plug immersion
heaters. For additional information,
consult your Watlow representative.
Single or Double Pole Thermostat
21⁄2 " NPT–3 FIREBAR elements
To order, specify CSA certified
enclosure, process temperature
(°F), maximum working pressure of
application (psig), media being
heated and heater mounting
orientation (horizontal or vertical)
and screw plug size.
Pilot Light
The optional pilot light gives the
operator visual indication of heater
on or off power status.
The PL10 pilot light is configured to a
maximum 250VÅ(ac), and supplied
with six inch (150 mm) leads.
Thermostats
To provide process temperature
control, Watlow offers optional single
pole, single throw (SPST) and double
pole, single throw (DPST)
thermostats.
324
The PL11 pilot light is rated for
480VÅ(ac), and supplied with four
inch (100 mm) leads.
Pilot lights may be attached to either
single or double pole thermostats
with general purpose (NEMA 1)
enclosure only. For moisture or
Unless otherwise specified,
thermostats are mounted inside the
terminal enclosure. For details and
ordering information, refer to
Thermostats on pages 423 to 425.
explosion resistant terminal
enclosures (NEMA 4 or NEMA 7),
consult factory.
To order, refer to the Build-a-Code
chart on page 336.
Please verify that the thermostat’s
sensing bulb O.D. is compatible with
the screw plug’s thermowell I.D.
W A T L O W
Tubular and
Process Assemblies
Screw Plug
Immersion Heaters
Options
Continued
Thermocouples
Type J or K thermocouples offer
extremely accurate sensing of
process and/or sheath temperatures.
A thermocouple may be inserted into
the thermowell or attached to the
heater’s sheath.
Thermocouples are supplied with
120 inch (305 mm) leads (longer
lead lengths available). Unless
otherwise specified, thermocouples
are supplied with temperature
ranges detailed on the
Thermocouple Types chart.
Using a thermocouple requires an
appropriate temperature and power
control. These must be purchased
separately. Watlow offers a wide
variety of temperature and power
controls to meet virtually all
applications. Temperature controls
can be configured to accept
process variable inputs, too. Consult
your Watlow representative for
details.
To order, specify Type J or K
thermocouple and lead length.
Indicate if the thermocouple is for
process temperature sensing or
heater sheath high-limit protection.
Please specify if the screw plug will
be mounted vertical or horizontal in
the tank. If vertical, indicate if the
housing is on top or bottom.
If the screw plug heater is mounted
in an in-line circulation heating
application, indicate flow direction
relative to the heater’s enclosure.
Thermocouple Types
Recommended
ASTM Conductor Characteristics Temperature Range
Type Positive Negative °F (°C)
J Iron Constantan 0 to 1000 (-20 to 540)
(Magnetic) (Non-Magnetic)
K Chromel
(non-magnetic) (Magnetic)
➀
Type J and Type K thermocouples are rated 32 to 1382°F and 32 to 2282°F (0-750°C and
0-1250°C), respectively. Watlow does not recommend exceeding temperature ranges shown
on this chart for the tubular product line.
®
Alumel
®
0 to 2000 (-20 to 1100)
➀
Wattages and Voltages
Watlow routinely supplies screw plug
immersion heaters with 120 to
480VÅ(ac) as well as wattages from
Sheath Materials
The following sheath materials are
available on WATROD and FIREBAR
heating elements:
External Finishing
Passivation
During the manufacturing process,
particles of iron or tool steel may
become embedded in the stainless
steel or alloy sheath. If not removed,
these particles may corrode,
250 watts to 38kW. If required,
Watlow will configure heaters with
voltages and wattages outside these
special voltage and wattage
configurations, consult your Watlow
representative.
parameters. For more information on
Standard Sheath Materials Made-to-Order Sheath Materials
WATROD
FIREBAR
Incoloy
316 stainless steel
Steel
Copper
®
Incoloy
WATROD
FIREBAR
Exotic Sheath Materials
304 stainless steel
®
Monel
304 stainless steel
®
Consult your Watlow representative
for details and availability.
Other Finishes
produce rust spots and/or
contaminate the process. For critical
applications, passivation will remove
free iron from the sheath. To order,
Simple belt polishing and glass
beading are available to meet
cosmetic demands. Consult factory
for details.
specify passivation.
Screw Plug
Alumel®and Chromel®are registered trademarks of the Hoskins Manufacturing Company.
Monel®is a registered trademark of
Special Metals Corporation.
325
Tubular and
1" (25 mm)
Minimum No-Heat Section
Process Assemblies
Screw Plug
Immersion Heaters
Options
Continued
Screw Plug Materials
The following screw plug materials
are available:
To order, specify screw plug size
and material.
Screw Plug Sizes
Including European
1
• NPT–1, 1
• Gas–G11⁄4, G11⁄2, G 2 inch
(brass only)
⁄4, 2, 21⁄2 inch
Standard Screw Plug Materials Made-to-Order Plug Materials
WATROD
FIREBAR
• BSP–1
1
⁄2
inch
304 stainless steel
316 stainless steel
Steel
Brass
304 stainless steel
(stainless steel only)
Consult factory for sizes and
materials not listed.
For both WATROD and FIREBAR,
consult factory about details and
availability.
To order, specify size, style (NPT,
Gas or BSP) and material.
BSP = British Standard Pipe
Gas = Gas pipe standard
Screw Plug to Flange Adaptors
Screw plug to flange adaptors permit
replacing flange heaters with screw
plug heaters. To order, specify the
appropriate code number.
Application Hints
• Select the recommended sheath
material and watt density for the
substance being heated. Use the
Supplemental Applications
Chart on pages 263 to 266. If
unable to determine the correct
heater material and type, consult
your Watlow representative.
• Extend the element’s no-heat
section completely into the fluid
being heated to help prevent
premature heater failure. See
accompanying illustration for
proper no-heat section placement.
• Locate screw plug heater low in
the tank, but above the sludge
level.
Screw Plug to Flange Adaptors
Screw Plug Estimated
to Flange Shipping Wt. Code
Adaptor Sizes Material lbs (kg) Availability Number
1
⁄4 to 3”-150# Steel 13 (5.9) Stock 125X3SA
1
1
2
⁄2 to 3”-150# Steel 11 (5.0) Stock 250X3SA
1
⁄2 to 4”-150# Steel 16 (7.3) Stock 250X4SA
2
2 1⁄2 to 5”-150# Steel 25 (11.3) Stock 250X5SA
2 1⁄2 to 6”-150# Steel 33 (15.0) Stock 250X6SA
• Minimize problems associated
with low liquid level conditions by
using a low liquid level sensor or
sheath temperature high-limit
control.
• Periodically remove the screw
plug assembly for inspection and
clean the heating element(s). This
preventive maintenance will
• Choose a FIREBAR element when
your application requires a
smaller system package or lower
watt density.
• Ensure wiring integrity by making
sure terminal enclosure
temperature does not exceed
400°F (205°C).
• Keep electrical connections
clean, dry and tight.
reduce premature failure and
optimize heater performance.
• Refer to the Installation and
Maintenance Instructions for
correct orientation of FIREBAR
elements. Correct element
orientation to flow minimizes
pressure drop, increases
buoyancy force and heater
performance.
326
W A T L O W
E
C
B
± 1%
Immersed Length
(1)
3
/4
"
Knockouts
F
D
H Bundle
304 Stainless Steel NPT Fitting
0.276" I.D. Thermowell
FIREBAR Element
G
A
No-Heat
Section
F
G
E
C
B
± 1%
Immersed Length
D
H Bundle
(1)
3
/4
"
Knockouts
NPT Fitting
Thermowell
-0.250" I.D. on 1" and 1
1
/4" NPT Plug
-0.375" I.D. on 2" and 2
1
/2" NPT Plugs
WATROD Element
A
No-Heat
End
Tubular and
Process Assemblies
Screw Plug
Immersion Heaters
Screw Plug Heater Dimensions
WATROD and FIREBAR Screw Plug Immersion Heater Dimensions
Heater NPT Size A Dimension C Dimension D Dimension E Dimension F Dimension G Dimension H Dimension*
Type in in (mm) in (mm) in (mm) in (mm) in (mm) in (mm) in (mm)
7
WATROD 1 1 (25)
WATROD 1 1⁄
4 1
WATROD 2 Steel 2
15
16 (24)
⁄
9
⁄16 (65) 1 (25) 1 11⁄16 (43) 2 5⁄8 (67) 4 5⁄8 (117) 2 1⁄2 (64) 2 1⁄4 (57)
⁄8 (22) 1 1⁄4 (32) 2 5⁄8 (67) 4 5⁄8 (117) 1 3⁄8 (35) 1 1⁄8 (29)
15
16 (24) 1
⁄
5
16 (33) 2
⁄
WATROD 2 Brass 2 11⁄16 (68) 1 1⁄16 (27) 1 9⁄16 (40) 2 5⁄8 (67) 4 5⁄8 (117) 2 1⁄2 (64) 2 1⁄4 (57)
WATROD 2 S. Steel 2 13⁄
WATROD 2
FIREBAR 1 1⁄4
FIREBAR 2
1
⁄2 2 3⁄16 (56) 1 5⁄16 (33) 2 1⁄16 (52) 2 5⁄8 (67) 4 5⁄8 (117) 3 1⁄2 (76) 2 1⁄2 (64)
3
1
⁄2 3 3⁄8 (86) 1 1⁄4 (32) 1 1⁄2 (38) 2 5⁄8 (67) 4 5⁄8 (117) 3 1⁄2 (76) 2 1⁄2 (64)
16 (71) 1 (25) 1
7
(98)
⁄8
13
⁄16
(21) 1
5
8 (41) 2
⁄
1
(27) 2
⁄16
* Note: All plug bundles fit into equivalent NPT coupling. They do not fit in equivalent pipe sizes.
1" NPT Screw Plug – WATROD Element
WATROD Immersed Code No. Est. Ship.
Screw Plug
Description kW B Dimension
Immersion Heaters
inch (mm) 1-Phase 1-Phase lbs (kg)
120VÅ(ac) 240VÅ(ac)
Application: Clean Water
2
60 W/in
Brass Plug 0.75 61⁄2 (165) BCC6J1 BCC6J10 3 (2)
1-Copper 1.0 6
(9.3 W/cm
Applications: Lightweight Oils, Degreasing Solutions, Heat Transfer Oils
2
23 W/in
Steel Plug 0.35 91⁄4
1-Steel 0.5 9
(3.6 W/cm
0.5 41⁄2 (114) BCC4J1 BCC4J10 3 (2)
5
2
) 1.25 8 (203) BCC8A1 BCC8A10 4 (2)
⁄8 (168) BCC6L1 BCC6L10 3 (2)
1.5 105⁄8 (270) BCC10L1 BCC10L10 4 (2)
1
2.0 12
2.5 14
3.0 163⁄4 (426) BCC16N1 BCC16N10 6 (3)
4.0 21 (533) BCC21A10 6 (3)
0.25 61⁄2 (165) BCS6J1 BCS6J10 3 (2)
2
) 0.75 131⁄2 (343) BCS13J1 BCS13J10 5 (3)
1.0 163⁄4
1.5 23
⁄2 (318) BCC12J1 BCC12J10 5 (3)
3
⁄4 (375) BCC14N1 BCC14N10 5 (3)
(235) BCS9E1 BCS9E10 4 (2)
3
⁄8 (238) BCS9G1 BCS9G10 4 (2)
(425) BCS16N1 BCS16N10 6 (3)
3
⁄4 (603) BCS23N1 BCS23N10 7 (4)
5
8 (67) 4
⁄
5
8 (67) 4
⁄
5
(67) 4
⁄8
Weight
5
8 (117) 1
⁄
5
8 (117) 2
⁄
5
(117) 1
⁄8
3
4 (44) 1
⁄
1
2 (64) 2
⁄
3
(44) 1
⁄4
3
8 (35)
⁄
1
4 (49)
⁄
3
(35)
⁄8
All heating elements are Assembly Stock
unless otherwise noted.
Availability
Assembly Stock: Three to five working days
327
Screw Plug
Tubular and
Process Assemblies
Screw Plug
Immersion Heaters
11⁄4" NPT Screw Plug – WATROD Element
WATROD Immersed Code No. Est. Ship.
Description kW B Dimension
120VÅ(ac) 120/240VÅ(ac) 240VÅ(ac)
inch (mm) 1-Phase 1-Phase 1-Phase lbs (kg)
Application: Clean Water
2
60 W/in
Brass Plug 0.75 6
0.5 43⁄8 (111) BDC4G1 BDC4G10 3 (2)
3
⁄8 (162) BDC6G1 BDC6G10 3 (2)
1-Copper
2
(9.3 W/cm
60 W/in
Brass Plug 1.5 6
)
➃
2
1.0 43⁄8 (111) BEC4G6 4 (2)
3
⁄8 (162) BEC6G6 4 (2)
2-Copper 2.0 81⁄2 (216) BEC8J6 5 (3)
(9.3 W/cm
2
) 2.5 103⁄4 (273) BEC10N6 5 (3)
3.0 15 (381) BEC15A6 6 (3)
4.0 19 (483) BEC19A10 7 (4)
5.0 231⁄2 (597) BEC23J10 8 (4)
1
6.0 27
⁄2 (699) BEC27J10 9 (4)
Applications: Lightweight Oils, Degreasing Solutions, Heat Transfer Oils
23 W/in
Steel Plug 0.5 7
0.5 63⁄8 (162) BES6G6 4 (2)
3
⁄8 (187) BES7G6 4 (2)
➃
2
2-Steel 0.7 87⁄8 (225) BES8R6 5 (3)
2
(3.6 W/cm
) 0.75 101⁄16 (256) BES10B6 5 (3)
1.0 12
1.5 19
3
⁄4 (324) BES12N6 6 (3)
3
⁄8 (492) BES19G6 7 (4)
2.0 253⁄8 (645) BES25G6 8 (4)
3.0 36
7
⁄8 (937) BES36R6 9 (4)
Applications: Forced Air and Gases, Caustic Solutions, Degreasing Solutions
➃
2
23 W/in
304 SS Plug 1.5 19 (483) BEN19A6 7 (4)
2-Incoloy
®
(3.6 W/cm2)
1.0 133⁄8 (340) BEN13G6 6 (3)
2.0 243⁄8 (619) BEN24G6 8 (4)
Weight
11⁄4" NPT Screw Plug– FIREBAR Element
FIREBAR Immersed Code No. Est. Ship.
Description kW B-Dimension
inch (mm)
240VÅ(ac) 240VÅ(ac) 480VÅ(ac)
1-Phase 3-Phase 3-Phase
Weight
lbs (kg)
Applications: Clean and Potable Water
2
90 W/in
304 SS Plug 3.0 11
1-Incoloy
(14 W/cm
⑧
®
2
1.5 75⁄8 (194) BDNF7R10
1
⁄8 (283) BDNF11G10
5.0 161⁄8 (410) BDNF16G3 BDNF16G5 7 (4)
) 6.5 191⁄8 (486) BDNF19G3 BDNF19G5 8 (4)
8.5 24
3
⁄8 (619) BDNF24L3 BDNF24L5 9 (4)
10.5 295⁄8 (753) BDNF29R3 BDNF29R5 10 (5)
5
12.7 34
17.0 451⁄8
21.5 55
⁄8 (879) BDNF34R3 BDNF34R5 11 (5)
(1146) BDNF45G3 BDNF45G5 13 (6)
5
⁄8 (1413) BDNF55R5 15 (7)
➁ Standard
➃ Wired for higher voltage.
➆ Not available as 3-phase – 1-phase only.
⑧ Can be wired 1-phase.
➁ ➆
➁ ➆
BDNF7R11
BDNF11G11
➁ ➆
➁ ➆
CONTINUED
328
5 (3)
6 (3)
All heating elements are
Assembly Stock unless
otherwise noted.
Availability
Assembly Stock: Three to five
working days
Standard: 10 working days
W A T L O W
Tubular and
Process Assemblies
Screw Plug
Immersion Heaters
11⁄4" NPT Screw Plug – FIREBAR Element
FIREBAR Immersed Code No. Est. Ship.
Description kW B Dimension
inch (mm)
240VÅ(ac) 240VÅ(ac) 480VÅ(ac)
1-Phase 3-Phase 3-Phase
Applications: Process Water, Ethylene Glycol (50%)
2
45 W/in
⑧
2.0 13 (330) BDNF13A27 6 (3)
304 SS Plug 2.5 151⁄2 (394) BDNF15J27 7 (4)
1-Incoloy
(7 W/cm2) 4.0 221⁄
®
3.0 18 (457) BDNF18A27 8 (4)
2 (572) BDNF22J27 BDNF22J28 9 (4)
5.0 27
6.0 321⁄
1
⁄2 (699) BDNF27J27 BDNF27J28 10 (5)
2 (826) BDNF32J27 BDNF32J28 11 (5)
8.0 42 (1067) BDNF42A27 BDNF42A28 13 (6)
10.0 51
1
⁄2 (1308) BDNF51J27 BDNF51J28 15 (7)
Applications: Cooking Oils, Ethylene Glycol (100%)
2
30 W/in
304 SS Plug 2.2 191⁄
1-Incoloy
➂
®
1.7 161⁄8 (410) BDNF16G12 BDNF16G13 7 (4)
8 (486) BDNF19G12 BDNF19G13 8 (4)
2.8 243⁄8 (619) BDNF24L12 BDNF24L13 9 (4)
(4.7 W/cm2) 3.5 295⁄8 (752) BDNF29R12 BDNF29R13 10 (5)
5
4.25 34
5.7 45
7.2 55
⁄8 (880) BDNF34R12 BDNF34R13 11 (5)
1
⁄8 (1146) BDNF45G12 BDNF45G13 13 (6)
5
⁄8 (1413) BDNF55R12 BDNF55R13 15 (7)
Applications: Heat Transfer Oils, Mineral Oils, Degreasing Solutions
2
23 W/in
304 SS Plug 1.65 19
1-Incoloy
(3.6 W/cm
➇
®
1.25 161⁄8 (410) BDNF16G20 7 (4)
1
⁄8 (486) BDNF19G20 8 (4)
2.15 243⁄8 (619) BDNF24L20 BDNF24L19 9 (4)
2
) 2.65 295⁄8 (752) BDNF29R20 BDNF29R19 10 (5)
3.2 34
5
⁄8 (879) BDNF34R20 BDNF34R19 11 (5)
4.25 451⁄8 (1146) BDNF45G20 BDNF45G19 13 (6)
5
(1413) BDNF55R20 BDNF55R19 15 (6)
5.4 55
⁄8
Applications: Medium Weight Oils, Heat Transfer Oils, Lubrication Oils, Liquid Paraffin
2
15 W/in
304 SS Plug 0.83 15
1-Incoloy
(2.3 W/cm
➂
®
0.67 13 (330) BDNF13A29 6 (3)
1.0 18 (457) BDNF18A29 8 (4)
2
) 1.33 221⁄2
1.67 27
2.0 321⁄2 (826) BDNF32J29 BDNF32J30 11 (5)
2.67 42 (1067) BDNF42A29 BDNF42A30 13 (6)
3.33 511⁄2 (1308) BDNF51J29 BDNF51J30 15 (7)
1
⁄2 (394) BDNF15J29 7 (4)
(572) BDNF22J29 BDNF22J30 9 (4)
1
⁄2 (699) BDNF27J29 BDNF27J30 10 (5)
Weight
lbs (kg)
Screw Plug
Applications: Bunker C and #6 Fuel Oils, Asphalt
2
8 W/in
304 SS Plug 0.55 191⁄8 (486) BDNF19G22 8 (4)
1-Incoloy
(1.3 W/cm
➂ Must be operated 3-phase only.
➇ Can be wired 1-phase.
➂
®
0.43 161⁄8 (410) BDNF16G22 7 (4)
0.7 243⁄8
2
) 0.88 295⁄8 (753) BDNF29R22 BDNF29R21 10 (5)
1.08 34
1.4 45
(619) BDNF24L22 BDNF24L21 9 (4)
5
(880) BDNF34R22 BDNF34R21 11 (5)
⁄8
1
⁄8 (1146) BDNF45G22 BDNF45G21 13 (6)
1.8 555⁄8 (1413) BDNF55R22 BDNF55R21 15 (7)
All heating elements are
Assembly Stock unless
otherwise noted.
Availability
Assembly Stock: Three to five
working days
329
Tubular and
Process Assemblies
Screw Plug
Immersion Heaters
2" NPT Screw Plug – WATROD Element (Note: Will not fit into a two inch pipe)
WATROD Immersed Code No. Est. Ship.
Description kW B Dimension
inch (mm)
120VÅ(ac) 120/240VÅ(ac) 240/480VÅ(ac) 240VÅ(ac) 480VÅ(ac)
1-Phase 1-Phase 1-Phase 3-Phase 3-Phase
Application: Clean Water
60 W/in
2.0 81⁄8 (206) BGC78C6 BGC78C7 4 (2)
d
2
Brass Plug 3.0 111⁄8 (283) BGC711C6 BGC711C7 5 (3)
2-Copper 4.0 151⁄8 (384) BGC715C6 BGC715C7 6 (3)
(9.3 W/cm2) 5.0 181⁄8 (460) BGC718C6 BGC718C7
b
6.0 211⁄8 (537) BGC721C7 7 (4)
8.0 265⁄8 (676) BGC726L7 7 (4)
10.0 321⁄8 (816) BGC732C7 8 (4)
60 W/in
2
3.0 81⁄8 (206) BHC78C1 BHC78C3 BHC78C13
bc
Brass Plug 4.5 111⁄8 (283) BHC711C1 BHC711C3 BHC711C5 6 (3)
3-Copper 6.0 151⁄8 (384) BHC715C3 BHC715C5 7 (4)
(9.3 W/cm2) 7.5 181⁄8 (460) BHC718C3 BHC718C5 7 (4)
9.0 21
12.0 26
15.0 32
1
8 (537) BHC721C3 BHC721C5 8 (4)
⁄
5
8 (676) BHC726L3 BHC726L5 8 (4)
⁄
1
8 (816) BHC732C3 BHC732C5 9 (4)
⁄
Application: Process Water
d
2
48 W/in
304 SS Plug 3.0 131⁄4 (337) BGN713E6 BGN713E7 5 (3)
2-Incoloy
®
(7.5 W/cm2) 5.0 201⁄4 (514) BGN720E6 BGN720E7 7 (4)
e
2
48 W/in
304 SS Plug 4.5 13
3-Incoloy
®
(7.5 W/cm2) 7.5 201⁄4 (514) BHN720E3
2.0 93⁄4 (248) BGN79N6 BGN79N7 4 (2)
4.0 173⁄4 (451) BGN717N6 BGN717N7 6 (3)
6.0 251⁄4 (641) BGN725E7 7 (4)
8.0 323⁄
10.0 40
3.0 93⁄4 (248) BHN79N1 BHN79N3
6.0 173⁄4 (451) BHN717N3
9.0 251⁄4 (641) BHN725E3
12.0 323⁄4 (832) BHN732N3
15.0 401⁄4 (1022) BHN740E3 BHN740E5
18.0 473⁄4 (1213) BHN747N3
4 (832) BGN732N7 8 (4)
1
4 (1022) BGN740E7 9 (4)
⁄
b
1
⁄4 (337) BHN713E1 BHN713E3
BHN79N5 5 (3)
b
b
b
b
b
b
BHN713E5
BHN717N5
BHN720E5
BHN725E5
BHN732N5
BHN747N5
b
b
b
b
b
b
b
Weight
lbs (kg)
6 (3)
5 (3)
6 (3)
7 (4)
8 (4)
9 (4)
9 (4)
10 (5)
11 (5)
CONTINUED
All heating elements are Assembly Stock
unless otherwise noted.
Availability
Assembly Stock: Three to five working days
330
b Stock
c Must be operated 3-phase only.
d Wired for higher voltage.
e 240VÅ(ac) can be wired wye and operated at 480VÅ(ac) 3-phase to produce
1
⁄3 more kW
W A T L O W
Tubular and
Process Assemblies
Screw Plug
Immersion Heaters
2" NPT Screw Plug – WATROD Element (Note: Will not fit into a two inch pipe)
WATROD Immersed Code No. Est. Ship.
Description kW B Dimension 120VÅ(ac) 120/240VÅ(ac) 240/480VÅ(ac) 240VÅ(ac) 480VÅ(ac) Weight
Applications: Forced Air and Gases, Caustic Solutions, Degreasing Solutions
ef
2
23 W/in
304 SS Plug 4.5 251⁄
3-Incoloy
®
(3.6 W/cm2) 7.5 401⁄
Applications: Lightweight Oils, Degreasing Solutions, Heat Transfer Oils
d
2
23 W/in
Steel Plug 1.5 13
2-Steel 2.0 171⁄2 (445) BGS717J6
(3.6 W/cm2) 2.5 201⁄2 (521) BGS720J6 BGS720J7 7 (4)
2
23 W/in
Steel Plug 3.0 171⁄2 (445) BHS717J1 BHS717J3 BHS717J5
3-Steel 4.5 25 (635) BHS725A1 BHS725A3 BHS725A5 9 (4)
(3.6 W/cm2) 6.0 321⁄2 (826) BHS732J3 BHS732J5 12 (6)
Applications: Medium Weight Oils, Heat Transfer Oils, Liquid Paraffin
c
2
16 W/in
304 SS Plug 1.5 131⁄4 (337) BHN713E12 BHN713E13 6 (3)
3-Incoloy
(2.5 W/cm2) 2.5 201⁄4 (514) BHN720E12 BHN720E13 8 (4)
15 W/in
Steel Plug 2.0 171⁄
3-Steel 2.5 20
(2.3 W/cm
All heating elements are Assembly Stock
unless otherwise noted.
Availability
Assembly Stock: Three to five working days
Stock: Same day shipment
®
2
2
) 3.0 25 (635) BHSS25A3 BHSS25A5 9 (4)
inch (mm) 1-Phase 1-Phase 1-Phase 3-Phase 3-Phase lbs (kg)
3.0 173⁄4 (451) BHNA17N1 BHNA17N3
4 (641) BHNA25E1 BHNA25E3 BHNA25E5 9 (4)
6.0 323⁄
9.0 47
12.5 64
15.0 76
1.0 91⁄
4 (832) BHNA32N3 BHNA32N5
4 (1022) BHNA40E3 BHNA40E5 10 (5)
3
4 (1213) BHNA47N3 BHNA47N5 11 (5)
⁄
1
4 (1632) BHNA64E3 BHNA64E5 15 (7)
⁄
3
4 (1950) BHNA76E3 BHNA76E5 18 (9)
⁄
2 (241) BGS79J6 BGS79J7 4 (2)
1
⁄2 (343) BGS713J6
a
BGS713J7
a
BGS717J7 6 (3)
a
a
BHNA17N5
a
a
7 (4)
9 (4)
5 (3)
3.0 25 (635) BGS725A6 BGS725A7 7 (4)
4.0 321⁄2 (826) BGS732J6 BGS732J7 8 (4)
5.0 40 (1016) BGS740A6 BGS740A7 9 (4)
6.0 471⁄2 (1207) BGS747J7 10 (5)
1.5 91⁄2 (241) BHS79J1 BHS79J3 BHS79J13
c
a
5 (3)
7 (4)
7.5 40 (1016) BHS740A3 BHS740A5 13 (6)
9.0 471⁄2 (1207) BHS747J3 BHS747J5 13 (6)
12.5 64 (1626) BHS764A3 BHS764A5 17 (8)
1.0 93⁄4 (248) BHN79N12 BHN79N13 5 (3)
2.0 173⁄4 (451) BHN717N12 BHN717N13 7 (4)
(641) BHN725E12 BHN725E13 9 (4)
3.0 251⁄
4.0 32
5.0 40
6.0 47
1.5 131⁄
4.0 321⁄
5.0 40 (1016) BHSS40A3 BHSS40A5 13 (6)
6.0 47
7.5 58
9.0 69
4
3
(832) BHN732N12 BHN732N13 9 (4)
4
⁄
1
(1022) BHN740E12 BHN740E13 10 (5)
4
⁄
3
(1213) BHN747N12 BHN747N13 11 (5)
4
⁄
(337) BHSS13E3 BHSS13E13
4
(445) BHSS17J3 BHSS17J5 7 (4)
2
1
(521) BHSS20J3 BHSS20J5 8 (4)
2
⁄
(826) BHSS32J3 BHSS32J5 12 (6)
2
1
(1207) BHSS47J3 BHSS47J5 13 (6)
2
⁄
1
(1486) BHSS58J3 BHSS58J5 16 (8)
2
⁄
3
(1772) BHSS69N3 BHSS69N5 20 (9)
4
⁄
c
6 (4)
a Stock
c 3-phase wye only.
d Wired for higher voltage.
e 240VÅ(ac) can be wired wye and operated at 480VÅ(ac) 3-phase to produce 1⁄3
and watt density.
f Can be rewired wye to produce
1
of original kW and watt density (3-phase only).
⁄3
more kW
Screw Plug
331
Tubular and
Process Assemblies
Screw Plug
Immersion Heaters
21⁄2" NPT Screw Plug – WATROD Element
WATROD Immersed Code No. Est. Ship.
Description kW B Dimension
inch (mm)
120VÅ(ac) 240VÅ(ac) 480VÅ(ac)
1-Phase 3-Phase 3-Phase
Applications: Deionized Water, Demineralized Water
2
60 W/in
3.0 75⁄8
316 SS Plug 4.5 10
3-316 SS 6.0 14
Passivated 7.5 175⁄8
(9.3 W/cm
2
)
9.0 205⁄8
12.0 26
15.0 315⁄8
18.0 37
(194) BLR77L1 BLR77L3 BLR77L5 6 (3)
5
(270) BLR710L1 BLR710L3 BLR710L5 7 (4)
⁄8
5
⁄8 (372) BLR714L3 BLR714L5 9 (4)
(448) BLR717L3 BLR717L5 9 (4)
(524) BLR720L3 BLR720L5 11 (5)
1
⁄8 (664) BLR726C3 BLR726C5 12 (6)
(803) BLR731L3 BLR731L5 14 (7)
1
(943) BLR737C3 BLR737C5 15 (7)
⁄8
Application: Clean Water
2
60 W/in
3.0 75⁄8 (194) BLC77L1 BLC77L3 BLC77L13 6 (3)
Brass Plug 4.5 105⁄8 (270) BLC710L1 BLC710L3 BLC710L5 7 (4)
3-Copper 6.0 145⁄8
(9.3 W/cm
2
) 7.5 175⁄8 (448) BLC717L3 BLC717L5 9 (4)
9.0 205⁄8 (524) BLC720L3 BLC720L5
12.0 261⁄8
(371) BLC714L3 BLC714L5 9 (4)
a
(664) BLC726C3 BLC726C5
a
15.0 315⁄8 (803) BLC731L3 BLC731L5 14 (7)
18.0 371⁄8
(943) BLC737C3 BLC737C5 15 (7)
Application: Process Water
2
48 W/in
3.0 93⁄8
304 SS Plug 4.5 12
3-Incoloy
®
6.0 173⁄
(7.5 W/cm2) 7.5 197⁄8 (505) BLN719R3 BLN719R5 11 (5)
9.0 247⁄8 (632) BLN724R3 BLN724R5
12.0 32
15.0 39
18.0 473⁄8 (1203) BLN747G3 BLN747G5
(238) BLN79G1 BLN79G3 BLN79G5 6 (3)
7
⁄8 (327) BLN712R1 BLN712R3 BLN712R5 7 (4)
8 (441) BLN717G3 BLN717G5
3
8 (822) BLN732G3 BLN732G5
⁄
7
⁄8 (1013) BLN739R3 BLN739R5 15 (7)
a
a
a
a
Weight
lbs (kg)
11 (5)
12 (6)
9 (4)
12 (6)
14 (7)
17 (8)
CONTINUED
All heating elements are Assembly Stock
unless otherwise noted.
Availability
Assembly Stock: Three to five working days
Stock: Same day shipment
332
➀ Stock
W A T L O W
Tubular and
Process Assemblies
Screw Plug
Immersion Heaters
21⁄2" NPT Screw Plug – WATROD Element
WATROD Immersed Code No. Est. Ship.
Description kW B Dimension 120VÅ(ac) 240VÅ(ac) 480VÅ(ac) Weight
Applications: Forced Air and Gases, Caustic Solutions, Degreasing Solutions
ef
2
23 W/in
304 SS Plug 4.5 24
3-Incoloy
®
(3.6 W/cm2) 7.5 397⁄
Applications: Lightweight Oils, Degreasing Solutions, Heat Transfer Oils
f
2
23 W/in
Steel Plug 4.5 243⁄
3-Steel 6.0 32
(3.6 W/cm2) 7.5 393⁄4 (1010) BLS739N3 BLS739N5 15 (7)
Applications: Medium Weight Oils, Heat Transfer Oils, Liquid Paraffin
c
2
16 W/in
304 SS Plug 1.5 12
3-Incoloy
®
(2.5 W/cm2) 2.5 197⁄8
Applications: Bunker C and #6 Fuel Oils
c
2
8 W/in
Steel Plug 1.5 24
3-Steel 2.0 321⁄4 (819) BLS732E12 BLS732E13 14 (7)
(1.3 W/cm2) 2.5 393⁄
inch (mm) 1-Phase 3-Phase 3-Phase lbs (kg)
3.0 173⁄
6.0 323⁄
9.0 47
12.5 63
15.0 76
3.0 171⁄4 (438) BLS717E1 BLS717E3 BLS717E5
8 (441) BLNA17G1 BLNA17G3 BLNA17G5 9 (4)
7
⁄8 (632) BLNA24R1 BLNA24R3 BLNA24R5 12 (5)
8 (822) BLNA32G3 BLNA32G5
8 (1013) BLNA39R3 BLNA39R5 15 (7)
3
8 (1203) BLNA47G3 BLNA47G5 17 (8)
⁄
7
8 (1622) BLNA63R3 BLNA63R5 20 (9)
⁄
3
⁄8 (1940) BLNA76G3 BLNA76G5 23 (11)
4 (629) BLS724N1 BLS724N3 BLS724N5 12 (6)
1
⁄4 (819) BLS732E3 BLS732E5
a
a
a
14 (7)
9 (4)
14 (7)
9.0 471⁄4 (1200) BLS747E3 BLS747E5 17 (8)
12.5 633⁄4 (1619) BLS763N3 BLS763N5 20 (9)
15.0 761⁄4
1.0 93⁄8
(1937) BLS776E3 BLS776E5 27 (13)
(238) BLN79G12 BLN79G13 6 (3)
7
⁄8 (327) BLN712R12 BLN712R13 7 (4)
2.0 173⁄8 (441) BLN717G12 BLN717G13 9 (4)
(505) BLN719R12 BLN719R13 11 (5)
7
3.0 24
4.0 32
(632) BLN724R12 BLN724R13 12 (6)
8
⁄
3
⁄8 (822) BLN732G12 BLN732G13 14 (7)
5.0 397⁄8 (1013) BLN739R12 BLN739R13 15 (7)
(1203) BLN747G12 BLN747G13 17 (8)
6.0 473⁄
1.0 171⁄
3.0 47
4.0 633⁄
5.0 76
8
(438) BLS717E12 BLS717E13 9 (4)
4
3
⁄4 (629) BLS724N12 BLS724N13 12 (6)
(1010) BLS739N12 BLS739N13 15 (7)
4
1
⁄4 (1200) BLS747E12 BLS747E13 17 (8)
(1619) BLS763N12 BLS763N13 20 (9)
4
1
⁄4 (1937) BLS776E12 BLS776E13 23 (11)
Screw Plug
All heating elements are Assembly Stock
unless otherwise noted.
Availability
Assembly Stock: Three to five working days
Stock: Same day shipment
a Stock
c Must be operated 3-phase only.
e 240VÅ(ac) can be wired wye and operated at 480VÅ(ac) 3-phase to
produce 1⁄3 more kW and watt density.
f Can be rewired wye to produce 1⁄3 of original kW and watt density
(3-phase only).
333
Tubular and
Process Assemblies
Screw Plug
Immersion Heaters
21⁄2" NPT Screw Plug – FIREBAR Element
FIREBAR Immersed Code No. Est. Ship.
Screw Plug
Description kW B Dimension
Immersion Heaters
inch (mm)
240VÅ(ac) 480VÅ(ac)
3-Phase 3-Phase
Applications: Clean and Potable Water
h
2
90 W/in
15 151⁄8
304 SS Plug 20 18
3-Incoloy
®
25 231⁄8 (587) BLNF23C5 14 (7)
(14 W/cm2)32285⁄
38 33
(384) BLNF15C3 BLNF15C5 10 (5)
1
8 (460) BLNF18C3 BLNF18C5
⁄
8 (727) BLNF28L5 17 (8)
5
8 (854) BLNF33L5 18 (9)
⁄
Applications: Process Water, Ethylene Glycol (50%)
45 W/in
6 12 (305) BLNF12A27 10 (5)
h
2
304 SS Plug 7.5 141⁄2 (368) BLNF14J27 11 (5)
3-Incoloy
(7 W/cm2)1221
®
9 17 (432) BLNF17A27 12 (6)
1
⁄2 (546) BLNF21J27 BLNF21J28 14 (7)
15 261⁄2 (673) BLNF26J27 BLNF26J28 17 (8)
18 311⁄
2 (800) BLNF31J27 BLNF31J28 18 (9)
24 41 (1041) BLNF41A28 20 (9)
30 50
1
⁄2 (1283) BLNF50J28 22 (10)
Applications: Cooking Oils, Ethylene Glycol (100%)
30 W/in
304 SS Plug 6.5 181⁄
3-Incoloy
®
5151⁄8 (384) BLNF15C12 BLNF15C13 10 (5)
8 (460) BLNF18C12 BLNF18C13 12 (6)
8.5 231⁄8 (587) BLNF23C12 BLNF23C13 14 (7)
c
2
(4.7 W/cm2) 10.5 285⁄8 (727) BLNF28L12 BLNF28L13 17 (8)
12.8 335⁄8 (854) BLNF33L12 BLNF33L13 18 (9)
17 441⁄8 (1121) BLNF44C12 BLNF44C13 20 (9)
5
21.5 54
⁄8 (1388) BLNF54L13 22 (10)
Applications: Heat Transfer Oils, Mineral Oils, Degreasing Solutions
h
2
23 W/in
304 SS Plug 4.9 181⁄8
3-Incoloy
®
(3.6 W/cm2) 7.9 285⁄8 (727) BLNF28L20 BLNF28L19 17 (8)
3.8 151⁄8 (384) BLNF15C20 10 (5)
(460) BLNF18C20 12 (6)
6.4 231⁄8 (587) BLNF23C20 BLNF23C19 14 (7)
9.6 335⁄8 (854) BLNF33L20 BLNF33L19 18 (9)
12.8 441⁄8 (1121) BLNF44C20 BLNF44C19 20 (9)
5
(1387) BLNF54L20 BLNF54L19 22 (10)
16.1 54
⁄8
c
CONTINUED
Weight
lbs (kg)
12 (6)
All heating elements are Assembly Stock
unless otherwise noted.
Availability
Assembly Stock: Three to five working days
Stock: Same day shipment
334
c Must be operated 3-phase only.
h Can be wired 1-phase.
W A T L O W
Tubular and
Process Assemblies
Screw Plug
Immersion Heaters
21⁄2" NPT Screw Plug – FIREBAR Element
FIREBAR Immersed Code No. Est. Ship.
Screw Plug
Description kW B Dimension
Immersion Heaters
inch (mm)
240VÅ(ac) 480VÅ(ac)
3-Phase 3-Phase
Applications: Medium Weight Oils, Heat Transfer Oils,
Lubrication Oils, Liquid Paraffin
15 W/in
304 SS Plug 2.5 141⁄2 (368) BLNF14J29 11 (5)
3-Incoloy
(2.3 W/cm2)4211⁄2
®
2 12 (305) BLNF12A29 10 (5)
3 17 (432) BLNF17A29 12 (6)
(546) BLNF21J29 BLNF21J30 14 (7)
526
6311⁄2
8 41 (1041) BLNF41A29 BLNF41A30 20 (9)
10 50
1
⁄2 (673) BLNF26J29 BLNF26J30 17 (8)
(800) BLNF31J29 BLNF31J30 18 (9)
1
⁄2 (1283) BLNF50J29 BLNF50J30 22 (10)
c
2
Applications: Bunker C and #6 Fuel Oils, Asphalt
c
2
8 W/in
304 SS Plug 1.63 181⁄8
3-Incoloy
(1.3 W/cm2) 2.63 285⁄8 (727) BLNF28L22 BLNF28L21 17 (8)
®
1.25 151⁄8 (384) BLNF15C22 10 (5)
(460) BLNF18C22 12 (6)
2.13 231⁄8 (587) BLNF23C22 BLNF23C21 14 (7)
3.19 335⁄8 (854) BLNF33L22 BLNF33L21 18 (9)
4.25 441⁄8 (1121) BLNF44C22 BLNF44C21 20 (9)
5.38 545⁄
8 (1388) BLNF54L22 BLNF54L21 22 (10)
Weight
lbs (kg)
All heating elements are Assembly Stock
unless otherwise noted.
Availability
Assembly Stock: Three to five working days
Stock: Same day shipment
➂ Must be operated 3-phase only.
Screw Plug
335
Tubular and
Process Assemblies
Screw Plug
Immersion Heaters
Build-a-Code
F.O.B.: Hannibal, Missouri
Stock Screw Plug Code Number
a
(Includes general purpose terminal enclosure (NEMA 1)
Optional Terminal Enclosure
S = General purpose with thermostat (NEMA 1)
W = Moisture resistant (NEMA 4)
E = Explosion resistant (NEMA 7)
E/W = Explosion/moisture resistant (NEMA 7/4)
Optional Thermostat
Optional Pilot Light
b
or Thermocouple
c
d
PL10 = 250VÅ(ac) Max.
PL11 = 480VÅ(ac) Max.
a Screw plug immersion heaters are supplied with a general purpose terminal enclosure
(NEMA 1). A thermostat will not fit inside the standard 25/
terminal enclosure. If a thermostat is required, a taller terminal enclosure will be supplied.
b Thermostat code numbers are shown in the Thermostat Stock chart on page 425.
c Pilot lights are configured for general purpose enclosure (NEMA 1) applications.
For pilot light availability with other terminal enclosure ratings, consult factory.
d Specify Type J or K thermocouple. If overtemp thermocouple specify orientation horizontal,
vertical up or vertical down.
How to Order
To order a stock screw plug heater,
please specify:
• Watlow code number
• NPT screw plug size and material
If our stock units do not meet your
application needs, Watlow can
provide made-to-order heaters.
For a made-to-order unit, please
specify:
• Application, including heated
• Volts/watts
• Phase
• Options
• Quantity
• Volts/watts
• Watt density
8 inch (67 mm) tall general purpose
material, process temperature
and flow rate, etc.
• Phase
• Screw plug size, style and
material
• Element diameter
• Number of heating element(s)
• Sheath material
• Immersed (‘B’ dimension) length
• No-heat section below the plug
• Terminal enclosure type
• Options
• Quantity
Availability
Stock: Same day shipment
Assembly Stock: Three to five
working days
➃
Modified Stock
: Five to seven
working days
Standard: 10 working days
Made-to-Order: Four to six weeks
Options, complexity and quantity
may affect availability and lead
times. Consult factory.
d Stock and assembly stock units with
catalog options.
336
W A T L O W
Tubular and
Process Assemblies
Screw Plug
Immersion Heaters
with Control Assembly
On stock chart units:
• Five working days on all heaters
• 10 working days on special voltages
and/or wattages
• 15 working days on special element lengths
Constructed from a WATROD screw
plug heater, a moisture resistant
(NEMA 4) terminal enclosure and
built-in temperature sensor and
power control, this assembly comes
pre-wired and ready for hook-up to
any 120VÅ(ac) control circuit.
Optional sheath materials, NPT
screw plug sizes and materials,
wattages, voltages and terminal
enclosures extend application
versatility.
Performance Capabilities
• Watt densities to 60 W/in
2
(9.3 W/cm2)
• Wattages to 20kW
• Voltages to 600VÅ(ac)
• Incoloy®sheath temperatures
to 1400°F (760°C)
Features and Benefits
• Three 0.475 inch (12 mm)
diameter WATROD elements are
brazed to a two inch NPT brass
screw plug to produce a
pressure-tight seal.
• WATROD hairpins are
repressed (recompacted) after
bending to maintain MgO density,
dielectric strength, heat transfer
and life.
• Two built-in thermostats, one
on-off with manual reset, help
ensure safe operation by
automatically cycling on and
off when process or sheath
temperatures reach a
predetermined set point
selectable from 30° to 250°F
(0° to 120°C).
• Internal mechanical contactor
works on a 120VÅ(ac) control
circuit to switch higher volts/amps
to the heating elements.
WATROD Heating Element
• Hinged, moisture resistant
(NEMA 4) terminal enclosure
has two conduit openings to
3
accommodate
⁄4 inch NPT conduit
fittings.
• Terminal enclosures can be
rotated to mate with existing
conduits.
• Thermowells allow replacing the
thermostat sensing element
without draining the fluid being
heated.
2" NPT Pipe Thread
Internal
Thermostat
On-off
Manual
Reset
Thermostat
Mechanical Contactor
Applications
• Water heating
• Commercial dishwashers and
glass washers
• Sterilizing equipment
Construction Features
Same as Screw Plug Immersion
Heaters. See pages 321 to 322 for
details.
Application Hints
Same as Screw Plug Immersion
Heaters. See page 326 for details.
Accessories
Clamping Nut, Gasket and Washers–
for mounting to thin-wall tanks, use
optional clamping nut, gasket and
washers. To order, specify NGW.
337
Screw Plug
Tubular and
Process Assemblies
Screw Plug
Immersion Heaters
with Control Assembly
Incoloy® Sheath
Conduit Openings
3
for
/4" NPT
2" NPT Brass Plug
B
Immersed Length
1
"
2
/4
(57 mm)
1
"
4
/4
(108 mm)
"
10
(250 mm)
2" NPT Brass Screw Plug With Control Box (Assembly Stock)
WATROD Immersed Code Number Est.Net
Descript. kW Length
Inch (mm)
2
50 W/in
Brass Plug 12 30 (762) BHNB30A2W2C11BHNB30A3W2C11 BHNB30A8W2C11 BHNB30A5W2C11 BHNB30A16W2C11 24 (11)
3-Incoloy®16 355⁄
(7.8 W/cm
9243⁄4 (629) BHNB24N3W2C11 BHNB24N5W2C11 BHNB24N16W2C11 23 (10)
2
)20 455⁄8 (1159) BHNB45L3W2C11 BHNB45L8W2C11 BHNB45L5W2C11 BHNB45L16W2C11 27 (12)
8 (905) BHNB35L2W2C11 BHNB35L3W2C11 BHNB35L8W2C11 BHNB35L5W2C11 BHNB35L16W2C11 25 (11)
How to Order
To order an Assembly Stock unit,
please specify:
• Watlow code number
• Volts/watts
• Options, if applicable
• Quantity
208VÅ(ac) 240VÅ(ac) 380VÅ(ac) 480VÅ(ac) 575VÅ(ac)
3-Phase 3-Phase 3-Phase 3-Phase 3-Phase
If our assembly stock units do not
meet your application needs,
Watlow can provide made-to-order
assemblies. For made-to order units,
please specify:
• Volts/watts
• Phase
• Screw plug size and materials
• Number of elements
• Sheath material
• Immersed (‘B’ dimension) length
• No-heat section below the plug
• Options
Availability
Assembly Stock: Five working days
Modified Stocka: Five to seven
working days
Made-to-Order: Four to six weeks
Options, complexity and quantity
may affect availability and lead
times. Consult factory.
Replacement Heater Only
To order a replacement screw plug
heater, simply delete the last five
characters from the original Screw
Plug Immersion with Control
Assembly base code number.
Weight
lbs (kg)
• Quantity
a Assembly Stock units with catalog options.
338
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