Watlow WATROD, FIREBAR ANSI Specifications
Immersion Heaters
WATROD and FIREBAR ANSI Flange
Immersion Heaters
Watlow flange heaters are easy to install and maintain.
Designed for heating liquids and gases in tanks and
pressure vessels, flange immersion heaters are ideal for
applications requiring higher kilowatts.
Watlow flange heaters are made with WATROD or
FIREBAR tubular elements brazed or welded to a flange.
Stock flange heaters are equipped with a general purpose
terminal enclosure.
Flange heaters, with FIREBAR elements, also answer
the need for liquid immersion applications requiring high
kilowatts in small tanks. The FIREBAR element’s unique
flat surface geometry packs more power in a smaller
bundle, with lower watt density, making it especially
well-suited for petroleum-based liquid heating applications.
Performance Capabilities
• Watt densities up to 100 W/in2 (15.5 W/cm2)
• Wattages up to three megawatts
• UL® and CSA component recognition up to 600VAC
• Alloy 800/840 sheath temperatures up to 1600°F
(870°C)
• Passivated 316 stainless steel sheath temperatures up
to 1200°F (650°C)
• 304 stainless steel sheath temperatures up to
1200°F (650°C)
• Steel sheath temperatures up to 750°F (400°C)
• FIREBAR flange heaters deliver more kilowatts in
smaller bundles
• A conventional round tubular 10-inch ANSI flange can
be replaced by a 6-inch ANSI FIREBAR flange with
same immersed length
Flange
Conduit Opening
Terminal Enclosure
Thermowell
FIREBAR
Heating Element
Features and Benefits
ANSI and ANSI compatible 2, 21/2, 3 thru 48 inch
flanges
• Provides appropriate heater size-to-application and fit
Element sheath and flange materials
• Meets your application needs
Integral thermowells
• Provides convenient temperature sensor insertion and
replacement without draining the fluid being heated
Standard, general purpose terminal enclosure
• Offers easy access to wiring
WATLOW
®
WATROD Heating Element
Element support(s)
• Provides proper element spacing to maximize heater
performance and life
All units are inspected and/or tested
• Ensures element-to-flange pressure seals do not leak
Drilled and tapped eyebolt holes or lift lugs for eye
bolts on 10 inch and larger flange heaters
• Facilitates lifting during installation
WATROD hairpins are repressed (recompacted)
• Provides improved heater life, insulation resistance and
heat transfer
237
Immersion Heaters
WATROD and FIREBAR ANSI Flange
Immersion Heaters
Features and Benefits (Continued)
FIREBAR flange heaters pack more kilowatts into a
smaller bundle
• Includes a conventional round tubular 10 in. (254 mm)
ANSI flange which can be replaced by a 6 in.
(152 mm) ANSI FIREBAR flange with the same
immersed length
Branch circuits are designed for 48 amperes per
circuit maximum
• Reduces risk of failure due to excessive temperatures
generated by high amperage
UL® and CSA component recognition under file
numbers E52951 and 31388 respectively
• Simplifies obtaining third-party recognition for
assembly
Typical 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
• Process air equipment
• Boiler equipment
• Freeze protection of any fluid
• Anti-freeze (glycol) solutions
• Paraffin
Options
Terminal Enclosures
General purpose terminal enclosures, without
thermostats, are standard on all flange immersion
heaters. Optional terminal enclosures include:
• General purpose with a single or double pole
thermostat.
• Moisture resistant. Available with or without a single
or double pole thermostat.
• Corrosion resistant. Available with or without a single
or double pole thermostat.
• Explosion resistant Class 1, Div. 1 and 2, Groups B, C,
D, T1 - T6. Available with or without a single or double
pole thermostat.
• Explosion/moisture resistant combinations. Available
with or without a single or double pole
thermostat.
Prior to ordering, refer to the terminal enclosure
dimensions on page 243. Order by adding the
appropriate suffix letter(s) to the base flange heater
part number, as shown on the Ordering information chart.
Heater part numbers and suffix letters are depicted on
the charts, pages 244 to 305. Specify class and group,
if applicable.
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 rating. Rating effectiveness may be compromised
by abuse or misapplication.
238
WATLOW
®
Immersion Heaters
Stand-off
Terminal
Enclosure
Conduit
Openings
Ref. 6 in.
(152 mm)
Stand-off
Height
ANSI
Flange
WATROD and FIREBAR ANSI Flange
Immersion Heaters
Options (Continued)
Stand-off Terminal Enclosures
Ref. 6 in.
Conduit
Openings
Stand-off
Terminal
Enclosure
(150 mm)
Stand-off
Height
Stand-off terminal enclosures provide an air-insulating
barrier between the flange and terminal enclosure by
mounting the terminations and wiring away from the
flange. Stand-off terminal enclosures are recommended
whenever a process operating temperature exceeds
210°F (100°C). This helps minimize terminal enclosure
temperatures.
To order, specify stand-off terminal enclosure.
ANSI
Flange
Certified Enclosures
CSA, ATEX or IECEx certified enclosures protect wiring in
hazardous gas environments. These terminal enclosures,
covered under CSA file number 61707, ATEX certificate
# SIRA 10ATEX1155X or IECEx certificate # IECEx CSA
09.0010X are available on WATROD flange heaters. For
additional information, see page 567 and 568 or contact
your Watlow representative.
For products that will be installed in hazardous locations,
please provide the following information:
• Operating conditions
• Minimum and maximum ambient temperatures for the
installation location
• Mounting orientation
Watlow must understand this information so that an
appropriate design can be provided.
ASME Pressure Vessel Code Welding
Flange assemblies can be provided with an ASME
Section VIII, Div. I pressure vessel stamp upon request.
WATLOW
®
Thermostats
To provide process temperature control, Watlow offers
optional single pole, single throw (SPST) and double pole,
single throw (DPST) thermostats.
Unless otherwise specified, thermostats are mounted
inside the terminal enclosure. For details and ordering
information, refer to Thermostats on pages 534 to 537.
Please verify that the thermostat’s sensing bulb O.D. is
compatible with the flange heater’s thermowell I.D.
Thermocouples
ASTM Type J or K thermocouples offer more 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 in. (3050 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 controller. These must be
purchased separately. Watlow offers a wide variety of
temperature and power controllers to meet virtually all
applications. Temperature controllers can be configured
to accept process variable inputs, too. Contact 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 flange heater will be
mounted vertical or horizontal in the tank. If vertical,
specify if the housing is on top or bottom.
If the flange heater is part of 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)
① 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)
①
239
Immersion Heaters
WATROD and FIREBAR ANSI Flange
Immersion Heaters
Options (Continued)
Wattages and Voltages
Watlow routinely supplies flange immersion heaters with
240 to 480VAC as well as wattages from 150 watts to
one megawatt.
Sheath Materials
The following sheath materials are available on WATROD
and FIREBAR flange heaters:
Standard Sheath Materials
WATROD Alloy 800, 840
316 SS
Steel
FIREBAR Alloy 800
Exotic Sheath Materials
Contact your Watlow representative for details and
availability.
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, produce rust spots and/or contaminate the
process. For critical sheath applications, passivation
will remove free iron from the sheath. To order,
specify passivation.
Other Finishes
Bright annealing available to meet cosmetic demands.
Flanges
Flange Sizes and Styles
Standard: 2①, 21/2①, 3 to 48 inch ANSI raised face/blind
flanges.
Made-to-Order: 16, 18, 20 and 24 inch in any
recognized configuration, as well as customer specified.
Over 48 inch ANSI flange, contact your Watlow
representative.
Flange Materials
Standard Carbon steel
316 SS
304 SS
Pressure Classes
Standard 150 lb
300 lb
600 lb
① ANSI bolt pattern only
Gaskets
Rubber, asbestos-free and spiral wound gaskets are
available for all flange sizes. Order by specifying gasket
type, flange size/rating, process operating temperature
and pressure.
To make the correct selection, see the Gasket Selection
chart. It provides a recommended gasket type and
effective temperature rating.
To use this chart, multiply operating temperature by the
operating pressure to arrive at “Maximum PSIG x °F.”
This is listed in the chart’s first column.
Gasket Selection
Maximum Temperature
PSIG x °F °F Gasket Type
Up to 15,000 300 Rubber
Over 250,000 700 Asbestos-Free
Over 250,000 ③ Spiral Wound
Gasket
240
③ Depends on metal gasket material.
WATLOW
®
Immersion Heaters
Direction of Flow
WATROD and FIREBAR ANSI Flange
Immersion Heaters
Options (Continued)
Baffles
Direction of Flow
For forced circulation applications, 316 stainless steel
baffles can be arranged on the heating element bundle
to enhance and/or modify fluid or gas flow for better
heat transfer.
For open tank or convection heating applications,
standard element supports will be supplied.
To order, specify baffles.
ANSI Raised Face Blind Flange,
150# Class Dimensions
Pipe Size
3 7.50 0.94 6.00 0.75 4
4 9.00 0.94 7.50 0.75 8
5 10.00 0.94 8.50 0.88 8
6 11.00 1.00 9.50 0.88 8
8 13.50 1.12 11.75 0.88 8
10 16.00 1.19 14.25 1.00 12
12 19.00 1.25 17.00 1.00 12
14 21.00 1.38 18.75 1.12 12
16 23.50 1.44 21.25 1.12 16
18 25.00 1.56 22.75 1.25 16
20 27.50 1.69 25.00 1.25 20
24 32.00 1.88 29.50 1.38 20
Outside
Diameter
Flange
Thickness
Diameter
of Bolt
Circle
Diameter
of Bolt
Holes
Number of
Bolt Holes
Application Hints
• Select the recommended heating element sheath
material and watt density for the substance being
heated. Use the Supplemental Applications Chart on
pages 555 to 560. If unable to determine the correct
heating element sheath material and type, contact your
Watlow representative.
• Extend the element 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 flange heater low in the tank, but above the
sludge level.
• Choose a FIREBAR element when your application
requires a smaller system package or lower watt
density.
• Ensure wiring integrity by keeping terminal enclosure
temperature below 400°F (205°C).
• Size power feeder wires in accordance with National
Electrical Code guidelines and other applicable codes.
• Keep electrical connections clean, dry and tight.
• Minimize problems associated with low liquid level
conditions by using low liquid level sensor or sheath
temperature high-limit control.
No-Heat
Section
WATLOW
• Periodically remove the flange assembly to inspect
and clean the heating element(s). This preventive
maintenance will reduce premature failure and optimize
heater performance.
• Refer to the Installation and Maintenance Instructions
for correct orientation of FIREBAR elements. This is
important in air applications with customer-supplied
circulation tanks. Correct element orientation to flow
minimizes pressure drop and increases buoyancy force
and heater performance.
®
241
Immersion Heaters
Extended Capabilities For
WATROD and FIREBAR ANSI Flange
Immersion Heaters
Options
Enclosure Enhancements
• Enclosure heater to solve condensation and freeze
problems.
• Power distribution blocks to facilitate power feed line
wiring.
RTDs
If the process requires greater temperature sensing
accuracy than is possible with thermocouples, Watlow
can also supply RTDs in DIN or JIS calibrations. Contact
your Watlow representative for details.
Wattages and Voltages
If required, Watlow will make heaters with voltage up
to 600VAC and wattage beyond one megawatt. For
more information on special voltage and wattage
configurations, contact your Watlow representative.
xtEndEd
E
apability
C
Flanges
Flange Materials
Extended Exotic materials to
meet specific
application needs ①
Pressure Classes
Extended Over 600 lb ①
① Contact your Watlow representative
Sheath Materials
The following sheath materials are available on WATROD
and FIREBAR flange heaters:
Extended Sheath Materials
WATROD Titanium
304 and 321 SS
Hastelloy C276
Alloy 400 and 600
FIREBAR 304 SS
242
WATLOW
®
Immersion Heaters
'K'
4" = 7 7/8
5" = 8 7/8
6" = 9 7/8
8" = 12 1/8
10" = 14 5/8
12" = 17 1/4
14" = 19 3/8
75⁄8 in.
(193.7 mm)
5
¾ in.
(146 mm)
7
½ in. Ref.
(191 mm)
“F”
3 in. - 150# ANSI Flange
“D”
3" AND 4" FLANGE
'K'
5" = 8 7/8
6" = 9 7/8
8" = 12 1/8
10" = 14 5/8
12" = 17 1/4
14" = 19 3/8
7½ in. Ref.
(191 mm)
“F”
5
¾ in. Ref.
(146 mm)
7
5⁄8
in.
(193.7 mm)
“D”
95⁄16 in.
(237 mm)
“F”
“D”
“K”
4 in. - 150# ANSI Flange
WATROD and FIREBAR ANSI Flange
Immersion Heaters
Optional Moisture/Explosion Resistant
Enclosure Without Thermostat
Optional Moisture/Explosion Resistant
Enclosure With Thermostat
75⁄8 in.
(193.7 mm)
3 in. - 150# ANSI Flange
“D”
5⁄8
7
in.
(193.7 mm)
¾ in.
5
(146 mm)
7
½ in. Ref.
(191 mm)
“F”
4 to 14 in. - 150# ANSI Flange
“D”
“K”
77⁄8 in.
(200 mm)
“F”
“K”
Terminal Enclosure Dimensions
General Purpose & Moisture Resistant Enclosures
ANSI Flange
Size
in.
3
4
“F”
Thickness
in. (mm)
15
/16 (23.8) 53/4
15
/16 (23.8) 53/4
“K”
With
Thermostat
(146)
(146)
“K”
Without
Thermostat
See heater dwg.
See heater dwg.
“D”
in. (mm)
71/2
(191)
9 (229)
Note: 5 thru 12 in. (127 thru 305 mm) flange dimensions are on catalog
heater drawings.
Moisture/Explosion Resistant Enclosures
ANSI Flange
Size
in.
3
4
5
6
8
10
12
14
Optional General
Purpose/Moisture
Resistant Enclosure
“F”
Thickness
in. (mm)
15
/16 (23.8) N/A N/A 71/2 (191)
15
/16 (23.8) N/A
15
/16 (23.8)
1 (25.0)
11/8 (28.6)
13/16 (30.2)
11/4 (32.0)
13/8 (34.9)
“K”
With
Thermostat
“K”
Without
Thermostat
77/8 (200.0)
87/8 (225.4)
97/8 (250.8)
87/8 (225.4)
97/8 (250.8)
121/8 (308.0) 121/8 (308.0)
145/8 (371.5) 145/8
(371.5)
171/4 (438.0) 171/4 (438.0)
193/8 (492.1) 193/8 (492.1)
in. (mm)
9 (229)
10 (254)
11 (280)
131/2
16 (407)
19 (483)
21 (534)
Optional Moisture
Resistant Enclosure
With Thermostat
“D”
(343)
With Thermostat
“K”
“K”
¾
in. Ref.
5
(146 mm)
7½ in. Ref.
(191 mm)
7⁄8 in.
7
(200 mm)
“F”
“D”
3 and 4 in. - 150# ANSI Flange
“D”
5 to 14 in. - 150# ANSI Flange
To order: Reference the Ordering Information on page 306
WATLOW
®
9
5⁄16 in.
“F”
(237 mm)
3 in. - 150# ANSI Flange
Note: Dimensions for all 5 to 14 in. flange heaters with General Purpose
or Moisture Resistant Enclosure with thermostats are identical to units
supplied without thermostats.
“D”
“F”
4 in. - 150# ANSI Flange
“D”
95⁄16 in.
(237 mm)
“F”
243
Immersion Heaters
2¾ in. O.D.
(70 mm)
¾ in. NPT Knockout
Thermowell
0.475 in. (12.1 mm)
Dia. Element
4 in. (102 mm) Cold (Ref.)
45⁄8 in.
(117.5 mm)
35⁄8 in. Dia.
(92.1 mm)
“B”
®
WATROD and FIREBAR ANSI Flange
Immersion Heaters
®
Application: Clean Water
• 3 inch - 150 lb ANSI flange.
• WATROD elements
• Without thermostat
• General purpose or
moisture-resistant enclosures
• Single circuit
Description Volts kW Ph
• M - Manufacturing lead times
2
60 W/in
Steel Flange
3-Alloy 800
Elements
(9.3 W/cm2)
120 6.0 1 15
240 6.0 3 15
480 6.0 1 15
480 6.0 3 151/2 (394) 22 (10) FMN715J5S RS FMN715J5W RS
120 9.0 1 211/2 (546) 25 (12) FMN721J10S RS FMN721J10W RS
240 9.0 3 21
480 9.0 1 21
480 9.0 3 21
240 12.0 3 27 (686) 27 (13) FMN727A3S RS FMN727A3W RS
480 12.0 1 27 (686) 27 (13) FMN727A11S RS FMN727A11W RS
480 12.0 3 27 (686) 27 (13) FMN727A5S RS FMN727A5W RS
240 15.0 3 32
480 15.0 1 32
480 15.0 3 32
240 18.0 3 38 (965) 30 (14) FMN738A3S RS FMN738A3W RS
480 18.0 1 38 (965) 30 (14) FMN738A11S RS FMN738A11W RS
480 18.0 3 38 (965) 30 (14) FMN738A5S RS FMN738A5W RS
480 25.0 1 51 (1295) 34 (16) FMN751A11S RS FMN751A11W RS
480 25.0 3 51 (1295) 34 (16) FMN751A5S RS FMN751A5W RS
480 30.0 1 60
480 30.0 3 60
• RS - Next day shipment
up to 5 pieces
General Purpose
45⁄8 in.
(117.5 mm)
35⁄8 in. Dia.
(92.1 mm)
¾ in. NPT Knockout
Thermowell
4 in. (102 mm) Cold (Ref.)
“B”
0.475 in. (12.1 mm)
Dia. Element
Moisture Resistant
(2)
“B” Dim.
in. (mm)
53⁄8 in.
(136.5 mm)
1⁄8 in. Dia.
3
(79.4 mm)
Ship Wt.
lbs (kg)
¾ in. NPT Hubs
Thermowell
4 in. (102 mm) Cold (Ref.)
“B”
Part
Number Del.
0.475 in. (12.1 mm)
Dia. Element
Part
Number Del.
General Purpose Enclosure Moisture-Resistant Enclosure
1
/2 (394) 22 (10) FMN715J10S RS FMN715J10W RS
1
/2 (394) 22 (10) FMN715J3S RS FMN715J3W RS
1
/2 (394) 22 (10) FMN715J11S RS FMN715J11W RS
1
/2 (546) 25 (12) FMN721J3S RS FMN721J3W RS
1
/2 (546) 25 (12) FMN721J11S RS FMN721J11W RS
1
/2 (546) 25 (12) FMN721J5S RS FMN721J5W RS
1
/2 (826) 28 (13) FMN732J3S RS FMN732J3W RS
1
/2 (826) 28 (13) FMN732J11S RS FMN732J11W RS
1
/2 (826) 28 (13) FMN732J5S RS FMN732J5W RS
1
/2 (1537) 36 (17) FMN760J11S M FMN760J11W RS
1
/2 (1537) 36 (17) FMN760J5S M FMN760J5W RS
Notes: • All flange bundles are designed to fit the inside diameter
of the equivalent standard schedule pipe
• For ANSI flange dimensions, reference chart on page 241
2¾ in. O.D.
(70 mm)
2¾ in. O.D.
(70 mm)
244
WATLOW
®
Immersion Heaters
4"-150# FLANGE
①
®
WATROD and FIREBAR ANSI Flange
Immersion Heaters
®
Application: Clean Water
• 4 inch - 150 lb ANSI flange
• WATROD element
• Without thermostat
• General purpose or
moisture-resistant enclosures
Description Volts kW Ph#Circ.
60 W/in2
Steel Flange
6-Alloy 800
Elements
(9.3 W/cm2)
• RS - Next day shipment
up to 5 pieces
• M - Manufacturing lead times
240 12.0 1 2 15
240 12.0 3 1 15
480 12.0 1 1 15
480 12.0 3 1 15
240 18.0 1 2 21
240 18.0 3 1 21
480 18.0 1 1 21
480 18.0 3 1 21
240 24.0 1 2 27 (686) 36 (17) FON727A10S RS FON727A10W RS
240 24.0 3 2 27 (686) 36 (17) FON727A3S RS FON727A3W RS
480 24.0 1 1 27 (686) 36 (17) FON727A11S RS FON727A11W RS
480 24.0 3 1 27 (686) 36 (17) FON727A5S RS FON727A5W RS
240 30.0 3 2 32
480 30.0 1 2 32
480 30.0 3 1 32
240 36.0 3 2 38 (965) 43 (20) FON738A3S RS FON738A3W RS
480 36.0 1 2 38 (965) 43 (20) FON738A11S RS FON738A11W RS
480 36.0 3 1 38 (965) 43 (20) FON738A5S RS FON738A5W RS
480 50.0 3 2 51 (1295) 48 (22) FON751A5S RS FON751A5W RS
480 60.0 3 2 60
General Purpose and
Moisture Resistant
0.475 in. (12.1 mm) Dia. Element
5
½
in.
(140 mm)
8 in.
(203 mm)
Thermowell
4 in. (102 mm) Cold (Ref.)
“B”
① The number and size of the conduit opening will comply with the
National Electrical Code® standards.
“B” Dim.
in. (mm)
1
/2 (394) 31 (14) FON715J10S RS FON715J10W RS
1
/2 (394) 31 (14) FON715J3S RS FON715J3W RS
1
/2 (394) 31 (14) FON715J11S RS FON715J11W RS
1
/2 (394) 31 (14) FON715J5S RS FON715J5W RS
1
/2 (546) 34 (16) FON721J10S RS FON721J10W RS
1
/2 (546) 34 (16) FON721J3S RS FON721J3W RS
1
/2 (546) 34 (16) FON721J11S RS FON721J11W RS
1
/2 (546) 34 (16) FON721J5S RS FON721J5W RS
1
/2 (826) 39 (18) FON732J3S RS FON732J3W RS
1
/2 (826) 39 (18) FON732J11S RS FON732J11W RS
1
/2 (826) 39 (18) FON732J5S RS FON732J5W RS
1
/2 (1537) 52 (24) FON760J5S M FON760J5W M
Ship Wt.
lbs (kg)
General Purpose Enclosure
Notes: • All flange bundles are designed to fit the inside diameter
of the equivalent standard schedule pipe
• For ANSI flange dimensions, reference chart on page 241
Part
Number Del.
Part
Number Del.
Moisture-Resistant Enclosure
3
7⁄8 in. O.D.
(98.4 mm)
WATLOW
®
245
Immersion Heaters
®
WATROD and FIREBAR ANSI Flange
Immersion Heaters
®
Application: Clean Water
• 5 inch - 150 lb ANSI flange
• WATROD element
• Without thermostat
• General purpose or
moisture-resistant enclosures
Description Volts kW Ph# Circ.
60 W/in2
Steel Flange
6-Alloy 800
Elements
(9.3 W/cm2)
240 12.0 1 2 15
240 12.0 3 1 15
480 12.0 1 1 15
480 12.0 3 1 15
240 18.0 1 2 21
240 18.0 3 1 21
480 18.0 1 1 21
480 18.0 3 1 21
240 24.0 1 3 27 (686) 40 (19) FNN727A10S RS FNN727A10W RS
240 24.0 3 2 27 (686) 40 (19) FNN727A3S RS FNN727A3W RS
480 24.0 1 3 27 (686) 40 (19) FNN727A11S RS FNN727A11W RS
480 24.0 3 1 27 (686) 40 (19) FNN727A5S RS FNN727A5W RS
240 30.0 3 2 32
480 30.0 1 2 32
480 30.0 3 1 32
240 36.0 3 2 38 (965) 47 (22) FNN738A3S RS FNN738A3W RS
480 36.0 1 2 38 (965) 47 (22) FNN738A11S RS FNN738A11W RS
480 36.0 3 1 38 (965) 47 (22) FNN738A5S RS FNN738A5W RS
480 50.0 3 2 51 (1295) 52 (24) FNN751A5S RS FNN751A5W RS
480 60.0 3 2 60
General Purpose and
Moisture Resistant
7 in.
(178 mm)
8 in. O.D.
(203 mm)
①
4 in. (102 mm) Cold (Ref.)
Thermowell
“B”
0.475 in. (12.1 mm) Dia. Element
① The number and size of the conduit opening will comply with the
National Electrical Code® standards.
“B” Dim.
in. (mm)
1
/2 (394) 35 (16) FNN715J10S RS FNN715J10W RS
1
/2 (394) 35 (16) FNN715J3S RS FNN715J3W RS
1
/2 (394) 35 (16) FNN715J11S RS FNN715J11W RS
1
/2 (394) 35 (16) FNN715J5S RS FNN715J5W RS
1
/2 (546) 38 (18) FNN721J10S RS FNN721J10W RS
1
/2 (546) 38 (18) FNN721J3S RS FNN721J3W RS
1
/2 (546) 38 (18) FNN721J11S RS FNN721J11W RS
1
/2 (546) 38 (18) FNN721J5S RS FNN721J5W RS
1
/2 (826) 43 (20) FNN732J3S RS FNN732J3W RS
1
/2 (826) 43 (20) FNN732J11S RS FNN732J11W RS
1
/2 (826) 43 (20) FNN732J5S RS FNN732J5W RS
1
/2 (1537) 56 (26) FNN760J5S M FNN760J5W M
Ship Wt.
lbs (kg)
Part
Number Del.
General Purpose Enclosure
Part
Number
Moisture-Resistant Enclosure
4¾ in. O.D.
(121 mm)
Del.
• RS - Next day shipment
up to 5 pieces
• M - Manufacturing lead times
246
Notes: • All flange bundles are designed to fit the inside diameter
of the equivalent standard schedule pipe
• For ANSI flange dimensions, reference chart on page 241
WATLOW
®
Immersion Heaters
®
WATROD and FIREBAR ANSI Flange
Immersion Heaters
®
Application: Clean Water
• 5 inch - 150 lb ANSI flange
• WATROD element
• Without thermostat
• General purpose or
moisture-resistant enclosures
Description Volts kW Ph#Circ.
60 W/in2
Steel Flange
9-Alloy 800
Elements
(9.3 W/cm2)
• RS - Next day shipment
up to 5 pieces
• M - Manufacturing lead times
240 18.0 1 3 15
240 18.0 3 1 15
480 18.0 1 1 15
480 18.0 3 1 15
240 27.0 1 3 21
240 27.0 3 3 21
480 27.0 1 3 21
480 27.0 3 1 21
240 36.0 3 3 27 (686) 45 (21) FNN727A3XS RS FNN727A3XW RS
480 36.0 1 3 27 (686) 45 (21) FNN727A11XS RS FNN727A11XW RS
480 36.0 3 1 27 (686) 45 (21) FNN727A5XS RS FNN727A5XW RS
240 45.0 3 3 32
480 45.0 1 3 32
480 45.0 3 3 32
240 54.0 3 3 38 (965) 53 (24) FNN738A3XS RS FNN738A3XW RS
480 54.0 1 3 38 (965) 53 (24) FNN738A11XS RS FNN738A11XW RS
480 54.0 3 3 38 (965) 53 (24) FNN738A5XS RS FNN738A5XW RS
480 75.0 3 3 51 (1295) 60 (28) FNN751A5XS RS FNN751A5XW RS
480 90.0 3 3 60
General Purpose and
Moisture Resistant
7 in.
(178 mm)
8 in. O.D.
(203 mm)
①
4 in. (102 mm) Cold (Ref.)
Thermowell
“B”
0.475 in. (12.1 mm) Dia. Element
① The number and size of the conduit opening will comply with the
National Electrical Code® standards.
“B” Dim.
in. (mm)
1
/2 (394) 38 (18) FNN715J10XS RS FNN715J10XW RS
1
/2 (394) 38 (18) FNN715J3XS RS FNN715J3XW RS
1
/2 (394) 38 (18) FNN715J11XS RS FNN715J11XW RS
1
/2 (394) 38 (18) FNN715J5XS RS FNN715J5XW RS
1
/2 (546) 42 (19) FNN721J10XS RS FNN721J10XW RS
1
/2 (546) 42 (19) FNN721J3XS RS FNN721J3XW RS
1
/2 (546) 42 (19) FNN721J11XS RS FNN721J11XW RS
1
/2 (546) 42 (19) FNN721J5XS RS FNN721J5XW RS
1
/2 (826) 48 (22) FNN732J3XS RS FNN732J3XW RS
1
/2 (826) 48 (22) FNN732J11XS RS FNN732J11XW RS
1
/2 (826) 48 (22) FNN732J5XS RS FNN732J5XW RS
1
/2 (1537) 66 (30) FNN760J5XS M FNN760J5XW M
Ship Wt.
lbs (kg)
Notes: • All flange bundles are designed to fit the inside diameter
of the equivalent standard schedule pipe
• For ANSI flange dimensions, reference chart on page 241
Part
Number Del.
General Purpose Enclosure
Part
Number
Moisture-Resistant Enclosure
4¾ in. O.D.
(121 mm)
Del.
WATLOW
®
247
Immersion Heaters
4¾ in. O.D.
(121 mm)
Thermowell
1 in. (25 mm)
FIREBAR Element
4 in. (102 mm) Cold (Ref.)
“B”
8 in. O.D.
(203 mm)
7 in.
(178 mm)
0.475 in. (12.1 mm) Dia. Element
①
®
WATROD and FIREBAR ANSI Flange
Immersion Heaters
Application: Clean Water
• 6 inch - 150 lb ANSI flange
• WATROD element
• Without thermostat
• General purpose or
moisture-resistant enclosures
Description Volts kW Ph#Circ.
60 W/in2
Steel Flange
12-Alloy 800
Elements
(9.3 W/cm2)
• RS - Next day shipment
up to 2 pieces
• M - Manufacturing lead times
240 24.0 1 3 15
240 24.0 3 2 15
480 24.0 1 2 15
480 24.0 3 1 15
240 36.0 1 4 21
240 36.0 3 2 21
480 36.0 1 2 21
480 36.0 3 1 21
240 48.0 3 4 26
480 48.0 1 3 26
480 48.0 3 2 26
240 60.0 3 4 32
480 60.0 1 3 32
480 60.0 3 2 32
240 72.0 3 4 37
480 72.0 3 2 37
480 100.0 3 4 50
480 120.0 3 4 60
“B” Dim.
in. (mm)
3
3
3
3
3
3
3
3
7
7
7
3
3
3
7
7
7
3
General Purpose and
Moisture Resistant
8 in.
(203 mm)
(203 mm)
① The number and size of the conduit opening will comply with the
/8 (390.5) 73 (33) FPN715G10S RS FPN715G10W RS
/8 (390.5) 73 (33) FPN715G3S RS FPN715G3W RS
/8 (390.5) 73 (33) FPN715G11S RS FPN715G11W RS
/8 (390.5) 73 (33) FPN715G5S RS FPN715G5W RS
/8 (542.9) 78 (36) FPN721G10S M FPN721G10W M
/8 (542.9) 78 (36) FPN721G3S M FPN721G3W M
/8 (542.9) 78 (36) FPN721G11S M FPN721G11W M
/8 (542.9) 78 (36) FPN721G5S M FPN721G5W M
/8 (682.6) 81 (37) FPN726R3S M FPN726R3W M
/8 (682.6) 81 (37) FPN726R11S M FPN726R11W M
/8 (682.6) 81 (37) FPN726R5S M FPN726R5W M
/8 (822.3) 85 (39) FPN732G3S M FPN732G3W M
/8 (822.3) 85 (39) FPN732G11S M FPN732G11W M
/8 (822.3) 85 (39) FPN732G5S M FPN732G5W M
/8 (962.0) 92 (42) FPN737R3S M FPN737R3W M
/8 (962.0) 92 (42) FPN737R5S M FPN737R5W M
/8 (1292.2) 100 (45) FPN750R5S M FPN750R5W M
/8 (1533.5) 110 (50) FPN760G5S M FPN760G5W M
8 in.
①
Thermowell
4 in. (102 mm) Cold (Ref.)
“B”
0.475 in. (12.1 mm) Dia. Element
National Electrical Code® standards.
Ship Wt.
lbs (kg)
General Purpose Enclosure
Part
Number Del.
Part
Number
Moisture-Resistant Enclosure
Notes: • All flange bundles are designed to fit the inside diameter
of the equivalent standard schedule pipe
• For ANSI flange dimensions, reference chart on page 241
Truck Shipment only
7⁄8 in. O.D.
5
(149.2 mm)
®
Del.
248
WATLOW
®
Immersion Heaters
4¾ in. O.D.
(121 mm)
Thermowell
1 in. (25 mm)
FIREBAR Element
4 in. (102 mm) Cold (Ref.)
“B”
8 in. O.D.
(203 mm)
7 in.
(178 mm)
0.475 in. (12.1 mm) Dia. Element
①
®
WATROD and FIREBAR ANSI Flange
Immersion Heaters
Application: Clean Water
• 6 inch - 150 lb ANSI flange
• WATROD element
• Without thermostat
• General purpose or
moisture-resistant enclosures
Description Volts kW Ph#Circ.
60 W/in2
Steel Flange
15-Alloy 800
Elements
(9.3 W/cm
2
)
• M - Manufacturing lead times
240 30.0 1 3 15
240 30.0 3 5 15
480 30.0 1 3 15
480 30.0 3 1 15
240 45.0 1 5 21
240 45.0 3 5 21
480 45.0 1 3 21
480 45.0 3 5 21
240 60.0 3 5 26
480 60.0 1 3 26
480 60.0 3 5 26
240 75.0 3 5 32
480 75.0 1 5 32
480 75.0 3 5 32
240 90.0 3 5 37
480 90.0 3 5 37
480 125.0 3 5 50
480 150.0 3 5 60
(203 mm)
“B” Dim.
in. (mm)
3
/8 (390.5) 76 (35) FPN715G10XS M FPN715G10XW M
3
/8 (390.5) 76 (35) FPN715G3XS M FPN715G3XW M
3
/8 (390.5) 76 (35) FPN715G11XS M FPN715G11XW M
3
/8 (390.5) 76 (35) FPN715G5XS M FPN715G5XW M
3
/8 (542.9) 82 (38) FPN721G10XS M FPN721G10XW M
3
/8 (542.9) 82 (38) FPN721G3XS M FPN721G3XW M
3
/8 (542.9) 82 (38) FPN721G11XS M FPN721G11XW M
3
/8 (542.9) 82 (38) FPN721G5XS M FPN721G5XW M
7
/8 (682.6) 85 (39) FPN726R3XS M FPN726R3XW M
7
/8 (682.6) 85 (39) FPN726R11XS M FPN726R11XW M
7
/8 (682.6) 85 (39) FPN726R5XS M FPN726R5XW M
3
/8 (822.3) 90 (41) FPN732G3XS M FPN732G3XW M
3
/8 (822.3) 90 (41) FPN732G11XS M FPN732G11XW M
3
/8 (822.3) 90 (41) FPN732G5XS M FPN732G5XW M
7
/8 (962.0) 98 (45) FPN737R3XS M FPN737R3XW M
7
/8 (962.0) 98 (45) FPN737R5XS M FPN737R5XW M
7
/8 (1292.2) 108 (49) FPN750R5XS M FPN750R5XW M
3
/8 (1533.5) 120 (55) FPN760G5XS M FPN760G5XW M
General Purpose and
Moisture Resistant
8 in.
8 in.
(203 mm)
①
Thermowell
4 in. (102 mm) Cold (Ref.)
“B”
0.475 in. (12.1 mm) Dia. Element
① The number and size of the conduit opening will comply with the
National Electrical Code® standards.
Ship Wt.
lbs (kg)
Notes: • All flange bundles are designed to fit the inside diameter
of the equivalent standard schedule pipe
• For ANSI flange dimensions, reference chart on page 241
Part
Number Del.
General Purpose Enclosure
Truck Shipment only
Part
Number
Moisture-Resistant Enclosure
7⁄8 in. O.D.
5
(149.2 mm)
Del.
®
WATLOW
®
249
WATLOW
®
Immersion Heaters
4"-150# FLANGE
®
WATROD and FIREBAR ANSI Flange
Immersion Heaters
®
Application: Deionized or
Demineralized Water
• 4 inch - 150 lb ANSI flange
• WATROD element
• Without thermostat
• General purpose or
moisture-resistant enclosures
Description Volts kW Ph#Circ.
60 W/in2
316 SS Flange
6-316 SS Elements
(9.3 W/cm2)
Passivated
• RS - Next day shipment
up to 5 pieces
240 12.0 1 2 16 (406) 31 (14) FOR716A10S RS FOR716A10W RS
240 12.0 3 1 16 (406) 31 (14) FOR716A3S RS FOR716A3W RS
480 12.0 1 1 16 (406) 31 (14) FOR716A11S RS FOR716A11W RS
480 12.0 3 1 16 (406) 31 (14) FOR716A5S RS FOR716A5W RS
240 18.0 1 2 22 (559) 34 (16) FOR722A10S RS FOR722A10W RS
240 18.0 3 1 22 (559) 34 (16) FOR722A3S RS FOR722A3W RS
480 18.0 1 1 22 (559) 34 (16) FOR722A11S RS FOR722A11W RS
480 18.0 3 1 22 (559) 34 (16) FOR722A5S RS FOR722A5W RS
240 24.0 1 2 27
240 24.0 3 2 27
480 24.0 1 1 27
480 24.0 3 1 27
240 30.0 3 2 33 (838) 39 (18) FOR733A3S RS FOR733A3W RS
480 30.0 1 2 33 (838) 39 (18) FOR733A11S RS FOR733A11W RS
480 30.0 3 1 33 (838) 39 (18) FOR733A5S RS FOR733A5W RS
240 36.0 3 2 38
480 36.0 1 2 38
480 36.0 3 1 38
480 50.0 3 2 51
480 60.0 3 2 61 (1549) 52 (24) FOR761A5S RS FOR761A5W RS
General Purpose and
Moisture Resistant
①
0.475 in. (12.1 mm) Dia. Element
5
½ in.
(140 mm)
8 in.
(203 mm)
Thermowell
4 in. (102 mm) Cold (Ref.)
“B”
① The number and size of the conduit opening will comply with the
National Electrical Code® standards.
“B” Dim.
in. (mm)
1
/2 (699) 36 (17) FOR727J10S RS FOR727J10W RS
1
/2 (699) 36 (17) FOR727J3S RS FOR727J3W RS
1
/2 (699) 36 (17) FOR727J11S RS FOR727J11W RS
1
/2 (699) 36 (17) FOR727J5S RS FOR727J5W RS
1
/2 (978) 43 (20) FOR738J3S RS FOR738J3W RS
1
/2 (978) 43 (20) FOR738J11S RS FOR738J11W RS
1
/2 (978) 43 (20) FOR738J5S RS FOR738J5W RS
1
/2 (1308) 48 (22) FOR751J5S RS FOR751J5W RS
Ship Wt.
lbs (kg)
Notes: • All flange bundles are designed to fit the inside diameter
of the equivalent standard schedule pipe
• For ANSI flange dimensions, reference chart on page 241
Part
Number Del.
General Purpose Enclosure
Part
Number Del.
Moisture-Resistant Enclosure
3
7⁄8 in. O.D.
(98.4 mm)
250
WATLOW
®
Immersion Heaters
4¾ in. O.D.
(121 mm)
Thermowell
1 in. (25 mm)
FIREBAR Element
4 in. (102 mm) Cold (Ref.)
“B”
8 in. O.D.
(203 mm)
7 in.
(178 mm)
0.475 in. (12.1 mm) Dia. Element
①
®
WATROD and FIREBAR ANSI Flange
Immersion Heaters
®
Application: Deionized or
Demineralized Water
• 6 inch - 150 lb ANSI flange
• WATROD element
• Without thermostat
• General purpose or
moisture-resistant enclosures
Description Volts kW Ph#Circ.
60 W/in2
316 SS Flange
12-316 SS Elements
(9.3 W/cm2)
(Passivated)
• RS - Next day shipment
up to 2 pieces
• M - Manufacturing lead times
240 24.0 1 3 15
240 24.0 3 2 15
480 24.0 1 2 15
480 24.0 3 1 15
240 36.0 1 4 21
240 36.0 3 2 21
480 36.0 1 2 21
480 36.0 3 1 21
240 48.0 3 4 27
480 48.0 1 3 27
480 48.0 3 2 27
240 60.0 3 4 32
480 60.0 1 3 32
480 60.0 3 2 32
240 72.0 3 4 38
480 72.0 3 2 38
480 100.0 3 4 51
480 120.0 3 4 60
General Purpose and
Moisture Resistant
8 in.
(203 mm)
① The number and size of the conduit opening will comply with the
“B” Dim.
in. (mm)
3
/4 (400) 73 (33) FPR715N10S RS FPR715N10W RS
3
/4 (400) 73 (33) FPR715N3S RS FPR715N3W RS
3
/4 (400) 73 (33) FPR715N11S RS FPR715N11W RS
3
/4 (400) 73 (33) FPR715N5S RS FPR715N5W RS
3
/4 (552) 78 (36) FPR721N10S M FPR721N10W M
3
/4 (552) 78 (36) FPR721N3S M FPR721N3W M
3
/4 (552) 78 (36) FPR721N11S M FPR721N11W M
3
/4 (552) 78 (36) FPR721N5S M FPR721N5W M
1
/4 (692) 81 (37) FPR727E3S M FPR727E3W M
1
/4 (692) 81 (37) FPR727E11S M FPR727E11W M
1
/4 (692) 81 (37) FPR727E5S M FPR727E5W M
3
/4 (832) 85 (39) FPR732N3S M FPR732N3W M
3
/4 (832) 85 (39) FPR732N11S M FPR732N11W M
3
/4 (832) 85 (39) FPR732N5S M FPR732N5W M
1
/4 (972) 92 (42) FPR738E3S M FPR738E3W M
1
/4 (972) 92 (42) FPR738E5S M FPR738E5W M
1
/4 (1302) 100 (45) FPR751E5S M FPR751E5W M
3
/4 (1543) 110 (50) FPR760N5S M FPR760N5W M
8 in.
(203 mm)
①
Thermowell
4 in. (102 mm) Cold (Ref.)
“B”
0.475 in. (12.1 mm) Dia. Element
National Electrical Code® standards.
Ship Wt.
lbs (kg)
Part
Number Del.
General Purpose Enclosure
Part
Number
Moisture-Resistant Enclosure
Notes: • All flange bundles are designed to fit the inside diameter
of the equivalent standard schedule pipe
• For ANSI flange dimensions, reference chart on page 241
Truck Shipment only
7⁄8 in. O.D.
5
(149.2 mm)
Del.
251
WATLOW
®
Immersion Heaters
4¾ in. O.D.
(121 mm)
Thermowell
1 in. (25 mm)
FIREBAR Element
4 in. (102 mm) Cold (Ref.)
“B”
8 in. O.D.
(203 mm)
7 in.
(178 mm)
0.475 in. (12.1 mm) Dia. Element
①
®
WATROD and FIREBAR ANSI Flange
Immersion Heaters
®
Application: Deionized or
Demineralized Water
• 6 inch - 150 lb ANSI flange
• WATROD element
• Without thermostat
• General purpose or
moisture-resistant enclosures
Description Volts kW Ph#Circ.
60 W/in2
316 SS Flange
15-316 SS Elements
(9.3 W/cm2)
(Passivated)
• M - Manufacturing lead times
240 30.0 1 3 15
240 30.0 3 5 15
480 30.0 1 3 15
480 30.0 3 1 15
240 45.0 1 5 21
240 45.0 3 5 21
480 45.0 1 3 21
480 45.0 3 5 21
240 60.0 3 5 27
480 60.0 1 3 27
480 60.0 3 5 27
240 75.0 3 5 32
480 75.0 1 5 32
480 75.0 3 5 32
240 90.0 3 5 38
480 90.0 3 5 38
480 125.0 3 5 51
480 150.0 3 5 60
General Purpose and
Moisture Resistant
8 in.
(203 mm)
8 in.
(203 mm)
① The number and size of the conduit opening will comply with the
National Electrical Code® standards.
“B” Dim.
in. (mm)
3
/4 (400) 76 (35) FPR715N10XS M FPR715N10XW M
3
/4 (400) 76 (35) FPR715N3XS M FPR715N3XW M
3
/4 (400) 76 (35) FPR715N11XS M FPR715N11XW M
3
/4 (400) 76 (35) FPR715N5XS M FPR715N5XW M
3
/4 (552) 82 (38) FPR721N10XS M FPR721N10XW M
3
/4 (552) 82 (38) FPR721N3XS M FPR721N3XW M
3
/4 (552) 82 (38) FPR721N11XS M FPR721N11XW M
3
/4 (552) 82 (38) FPR721N5XS M FPR721N5XW M
1
/4 (692) 85 (39) FPR727E3XS M FPR727E3XW M
1
/4 (692) 85 (39) FPR727E11XS M FPR727E11XW M
1
/4 (692) 85 (39) FPR727E5XS M FPR727E5XW M
3
/4 (832) 90 (41) FPR732N3XS M FPR732N3XW M
3
/4 (832) 90 (41) FPR732N11XS M FPR732N11XW M
3
/4 (832) 90 (41) FPR732N5XS M FPR732N5XW M
1
/4 (972) 98 (45) FPR738E3XS M FPR738E3XW M
1
/4 (972) 98 (45) FPR738E5XS M FPR738E5XW M
1
/4 (1302) 108 (49) FPR751E5XS M FPR751E5XW M
3
/4 (1543) 120 (55) FPR760N5XS M FPR760N5XW M
Ship Wt.
lbs (kg)
①
Thermowell
4 in. (102 mm) Cold (Ref.)
“B”
Part
Number Del.
General Purpose Enclosure
0.475 in. (12.1 mm) Dia. Element
7⁄8 in. O.D.
5
(149.2 mm)
Part
Number
Moisture-Resistant Enclosure
Notes: • All flange bundles are designed to fit the inside diameter
of the equivalent standard schedule pipe
• For ANSI flange dimensions, reference chart on page 241
Truck Shipment only
Del.
252
WATLOW
®
Immersion Heaters
2¾ in. O.D.
(70 mm)
¾ in. NPT Knockout
Thermowell
0.475 in. (12.1 mm)
Dia. Element
4 in. (102 mm) Cold (Ref.)
45⁄8 in.
(117.5 mm)
35⁄8 in. Dia.
(92.1 mm)
“B”
®
WATROD and FIREBAR ANSI Flange
Immersion Heaters
Application: Process Water
• 3 inch - 150 lb ANSI flange
• WATROD elements
• Without thermostat
• General purpose or
moisture-resistant enclosures
• Single circuit
Description Volts kW Ph
48 W/in2 6
Steel Flange
3-Alloy 800
Elements
(7.5 W/cm2)
• RS - Next day shipment
up to 5 pieces
240 4.5 1 13
240 4.5 3 13
480 4.5 1 13
480 4.5 3 13
240 6.0 1 18 (457) 23 (11) FMN718A10S RS FMN718A10W RS
240 6.0 3 18 (457) 23 (11) FMN718A3S RS FMN718A3W RS
480 6.0 1 18 (457) 23 (11) FMN718A11S RS FMN718A11W RS
480 6.0 3 18 (457) 23 (11) FMN718A5S RS FMN718A5W RS
240 7.5 1 20
240 7.5 3 20
480 7.5 1 20
480 7.5 3 20
240 9.0 1 25
240 9.0 3 25
480 9.0 1 25
480 9.0 3 25
240 12.0 3 33 (838) 28 (13) FMN733A3S RS FMN733A3W RS
480 12.0 1 33 (838) 28 (13) FMN733A11S RS FMN733A11W RS
480 12.0 3 33 (838) 28 (13) FMN733A5S RS FMN733A5W RS
240 15.0 3 40
480 15.0 1 40
480 15.0 3 40
240 18.0 3 48 (1219) 32 (15) FMN748A3S RS FMN748A3W RS
480 18.0 1 48 (1219) 32 (15) FMN748A11S RS FMN748A11W RS
480 18.0 3 48 (1219) 32 (15) FMN748A5S RS FMN748A5W RS
“B” Dim.
in. (mm)
1
/2 (343) 22 (10) FMN713J10S RS FMN713J10W RS
1
/2 (343) 22 (10) FMN713J3S RS FMN713J3W RS
1
/2 (343) 22 (10) FMN713J11S RS FMN713J11W RS
1
/2 (343) 22 (10) FMN713J5S RS FMN713J5W RS
1
/2 (521) 25 (12) FMN720J10S RS FMN720J10W RS
1
/2 (521) 25 (12) FMN720J3S RS FMN720J3W RS
1
/2 (521) 25 (12) FMN720J11S RS FMN720J11W RS
1
/2 (521) 25 (12) FMN720J5S RS FMN720J5W RS
1
/2 (648) 27 (13) FMN725J10S RS FMN725J10W RS
1
/2 (648) 27 (13) FMN725J3S RS FMN725J3W RS
1
/2 (648) 27 (13) FMN725J11S RS FMN725J11W RS
1
/2 (648) 27 (13) FMN725J5S RS FMN725J5W RS
1
/2 (1029) 30 (14) FMN740J3S RS FMN740J3W RS
1
/2 (1029) 30 (14) FMN740J11S RS FMN740J11W RS
1
/2 (1029) 30 (14) FMN740J5S RS FMN740J5W RS
General Purpose
45⁄8 in.
(117.5 mm)
35⁄8 in. Dia.
(92.1 mm)
Moisture Resistant
53⁄8 in.
(136.5 mm)
1⁄8 in. Dia.
3
(79.4 mm)
Ship Wt.
lbs (kg)
¾ in. NPT Knockout
Thermowell
4 in. (102 mm) Cold (Ref.)
(2)
¾ in. NPT Hubs
Thermowell
4 in. (102 mm) Cold (Ref.)
Part
Number Del.
General Purpose Enclosure
“B”
“B”
0.475 in. (12.1 mm)
Dia. Element
2¾ in. O.D.
(70 mm)
0.475 in. (12.1 mm)
Dia. Element
2¾ in. O.D.
(70 mm)
Part
Number Del.
Moisture-Resistant Enclosure
Notes: • All flange bundles are designed to fit the inside diameter
of the equivalent standard schedule pipe
• For ANSI flange dimensions, reference chart on page 241
6 Can be rewired wye to produce
1
/3 of the original kW and
watt density (3-phase only)
®
253
WATLOW
®
Immersion Heaters
4"-150# FLANGE
®
WATROD and FIREBAR ANSI Flange
Immersion Heaters
®
Application: Process Water
• 4 inch - 150 lb ANSI flange
• WATROD elements
• Without thermostat
• General purpose or
moisture-resistant enclosures
Description Volts kW Ph#Circ.
48 W/in2 6
Steel Flange
6-Alloy 800
Elements
(7.5 W/cm2)
• RS - Next day shipment
up to 5 pieces
240 9.0 1 1 13
240 9.0 3 1 131/2 (343) 29 (14) FON713J3S RS FON713J3W RS
480 9.0 1 1 13
480 9.0 3 1 13
240 12.0 1 2 18 (457) 32 (15) FON718A10S RS FON718A10W RS
240 12.0 3 1 18 (457) 32 (15) FON718A3S RS FON718A3W RS
480 12.0 1 1 18 (457) 32 (15) FON718A11S RS FON718A11W RS
480 12.0 3 1 18 (457) 32 (15) FON718A5S RS FON718A5W RS
240 15.0 1 2 201/2 (521) 34 (16) FON720J10S RS FON720J10W RS
240 15.0 3 1 201/2 (521) 34 (16) FON720J3S RS FON720J3W RS
480 15.0 1 1 201/2 (521) 34 (16) FON720J11S RS FON720J11W RS
480 15.0 3 1 201/2 (521) 34 (16) FON720J5S RS FON720J5W RS
240 18.0 1 2 25
240 18.0 3 1 25
480 18.0 1 1 251/2 (648) 36 (17) FON725J11S RS FON725J11W RS
480 18.0 3 1 251/2 (648) 36 (17) FON725J5S RS FON725J5W RS
240 24.0 1 2 33 (838) 39 (18) FON733A10S RS FON733A10W RS
240 24.0 3 2 33 (838) 39 (18) FON733A3S RS FON733A3W RS
480 24.0 1 1 33 (838) 39 (18) FON733A11S RS FON733A11W RS
480 24.0 3 1 33 (838) 39 (18) FON733A5S RS FON733A5W RS
240 30.0 3 2 401/2 (1029) 43 (20) FON740J3S RS FON740J3W RS
480 30.0 1 2 401/2 (1029) 43 (20) FON740J11S RS FON740J11W RS
480 30.0 3 1 40
240 36.0 3 2 48 (1219) 48 (22) FON748A3S RS FON748A3W RS
480 36.0 1 2 48 (1219) 48 (22) FON748A11S RS FON748A11W RS
480 36.0 3 1 48 (1219) 48 (22) FON748A5S RS FON748A5W RS
General Purpose and
Moisture Resistant
①
0.475 in. (12.1 mm) Dia. Element
5
½
in.
(140 mm)
8 in.
(203 mm)
Thermowell
4 in. (102 mm) Cold (Ref.)
“B”
① The number and size of the conduit opening will comply with the
National Electrical Code® standards.
“B” Dim.
in. (mm)
1
/2 (343) 29 (14) FON713J10S RS FON713J10W RS
1
/2 (343) 29 (14) FON713J11S RS FON713J11W RS
1
/2 (343) 29 (14) FON713J5S RS FON713J5W RS
1
/2 (648) 36 (17) FON725J10S RS FON725J10W RS
1
/2 (648) 36 (17) FON725J3S RS FON725J3W RS
1
/2 (1029) 43 (20) FON740J5S RS FON740J5W RS
Ship Wt.
lbs (kg)
Notes: • All flange bundles are designed to fit the inside diameter
of the equivalent standard schedule pipe
• For ANSI flange dimensions, reference chart on page 241
6 Can be rewired wye to produce
watt density (3-phase only)
Part
Number Del.
General Purpose Enclosure
Part
Number
Moisture-Resistant Enclosure
1
/3 of the original kW and
3
7⁄8 in. O.D.
(98.4 mm)
Del.
254
WATLOW
®
Immersion Heaters
Thermowell
5
½ in.
4 in. (102 mm) Cold (Ref.)
3
7⁄8 in. O.D.
(98.4 mm)
“B”
8 in.
(203 mm)
0.475 in. (12.1 mm) Dia. Element
①
®
WATROD and FIREBAR ANSI Flange
Immersion Heaters
Application: Process Water
• 4 inch - 150 lb ANSI flange
• FIREBAR elements
• Without thermostat
• General purpose or
moisture-resistant enclosures
Description Volts kW Ph#Circ.
45 W/in2
304 SS Flange
6-Alloy 800
Elements
(7 W/cm2)
• RS - Next day shipment
up to 5 pieces
240 12.0 3 1 13
240 15.0 3 1 16 (406.0) 35 (16) FONF16A27S RS FONF16A27W RS
240 18.0 3 1 18
240 24.0 3 2 22
480 24.0 3 1 227/8 (581.0) 41 (19) FONF22R28S RS FONF22R28W RS
240 30.0 3 2 277/8 (708.0) 44 (20) FONF27R27S RS FONF27R27W RS
480 30.0 3 1 277/8 (708.0) 44 (20) FONF27R28S RS FONF27R28W RS
240 36.0 3 2 32
480 36.0 3 1 32
480 48.0 3 2 423/8 (1076.3) 50 (23) FONF42G28S RS FONF42G28W RS
480 60.0 3 2 517/8 (1317.6) 54 (25) FONF51R28S RS FONF51R28W RS
“B” Dim.
in. (mm)
3
/8 (339.7) 32 (15) FONF13G27S RS FONF13G27W RS
3
/8 (466.7) 38 (17) FONF18G27S RS FONF18G27W RS
7
/8 (581.0) 41 (19) FONF22R27S RS FONF22R27W RS
7
/8 (835.0) 46 (21) FONF32R27S RS FONF32R27W RS
7
/8 (835.0) 46 (21) FONF32R28S RS FONF32R28W RS
General Purpose and
Moisture Resistant
5½ in.
(140 mm)
(212.7 mm)
① The number and size of the conduit opening will comply with the
National Electrical Code
Ship Wt.
lbs (kg)
①
4 in. (102 mm) Cold (Ref.)
83⁄8 in.
Part
Number Del.
General Purpose Enclosure
Notes: • All flange bundles are designed to fit the inside diameter
of the equivalent standard schedule pipe
• For ANSI flange dimensions, reference chart on page 241
Thermowell
®
standards.
1 in. (25 mm)
FIREBAR Element
“B”
Part
Number
Moisture-Resistant Enclosure
®
37⁄8 in. O.D.
(98.4 mm)
Del.
255
WATLOW
®
Immersion Heaters
①
®
WATROD and FIREBAR ANSI Flange
Immersion Heaters
®
Application: Process Water
• 5 inch - 150 lb ANSI flange
• WATROD elements
• Without thermostat
• General purpose or
moisture-resistant enclosures
Description Volts kW Ph#Circ.
2
48 W/in
Steel Flange
6-Alloy 800
Elements
(7.5 W/cm2)
• RS - Next day shipment
up to 5 pieces
240 9.0 1 1 13
240 9.0 3 1 131/2 (343) 33 (15) FNN713J3S RS FNN713J3W RS
480 9.0 1 1 131/2 (343) 33 (15) FNN713J11S RS FNN713J11W RS
480 9.0 3 1 131/2 (343) 33 (15) FNN713J5S RS FNN713J5W RS
240 12.0 1 2 18 (457) 36 (17) FNN718A10S RS FNN718A10W RS
240 12.0 3 1 18 (457) 36 (17) FNN718A3S RS FNN718A3W RS
480 12.0 1 1 18 (457) 36 (17) FNN718A11S RS FNN718A11W RS
480 12.0 3 1 18 (457) 36 (17) FNN718A5S RS FNN718A5W RS
240 15.0 1 2 201/2 (521) 38 (18) FNN720J10S RS FNN720J10W RS
240 15.0 3 1 201/2 (521) 38 (18) FNN720J3S RS FNN720J3W RS
480 15.0 1 1 201/2 (521) 38 (18) FNN720J11S RS FNN720J11W RS
480 15.0 3 1 201/2 (521) 38 (18) FNN720J5S RS FNN720J5W RS
240 18.0 1 2 251/2 (648) 40 (19) FNN725J10S RS FNN725J10W RS
240 18.0 3 1 251/2 (648) 40 (19) FNN725J3S RS FNN725J3W RS
480 18.0 1 1 251/2 (648) 40 (19) FNN725J11S RS FNN725J11W RS
480 18.0 3 1 251/2 (648) 40 (19) FNN725J5S RS FNN725J5W RS
240 24.0 1 3 33 (838) 43 (20) FNN733A10S RS FNN733A10W RS
240 24.0 3 2 33 (838) 43 (20) FNN733A3S RS FNN733A3W RS
480 24.0 1 1 33 (838) 43 (20) FNN733A11S RS FNN733A11W RS
480 24.0 3 1 33 (838) 43 (20) FNN733A5S RS FNN733A5W RS
240 30.0 3 2 401/2 (1029) 47 (22) FNN740J3S RS FNN740J3W RS
480 30.0 1 2 401/2 (1029) 47 (22) FNN740J11S RS FNN740J11W RS
480 30.0 3 1 401/2 (1029) 47 (22) FNN740J5S RS FNN740J5W RS
240 36.0 3 2 48 (1219) 52 (24) FNN748A3S RS FNN748A3W RS
480 36.0 1 2 48 (1219) 52 (24) FNN748A11S RS FNN748A11W RS
480 36.0 3 1 48 (1219) 52 (24) FNN748A5S RS FNN748A5W RS
General Purpose and
Moisture Resistant
7 in.
(178 mm)
8 in. O.D.
(203 mm)
Thermowell
4 in. (102 mm) Cold (Ref.)
“B”
0.475 in. (12.1 mm) Dia. Element
① The number and size of the conduit opening will comply with the
National Electrical Code® standards.
“B” Dim.
in. (mm)
1
/2 (343) 33 (15) FNN713J10S RS FNN713J10W RS
Ship Wt.
lbs (kg)
General Purpose Enclosure Moisture-Resistant Enclosure
Notes: • All flange bundles are designed to fit the inside diameter
of the equivalent standard schedule pipe
• For ANSI flange dimensions, reference chart on page 241
Part
Number Del.
Part
Number Del.
4¾ in. O.D.
(121 mm)
256
WATLOW
®
Immersion Heaters
①
®
WATROD and FIREBAR ANSI Flange
Immersion Heaters
®
Application: Process Water
• 5 inch - 150 lb ANSI flange
• WATROD elements
• Without thermostat
• General purpose or
moisture-resistant enclosures
Description Volts kW Ph#Circ.
48 W/in2
Steel Flange
9-Alloy 800
Elements
(7.5 W/cm2)
• RS - Next day shipment
up to 5 pieces
240 14.0 1 3 13
240 14.0 3 1 13
480 14.0 1 1 13
480 14.0 3 1 13
240 18.0 1 3 18 (457) 39 (18) FNN718A10XS RS FNN718A10XW RS
240 18.0 3 1 18 (457) 39 (18) FNN718A3XS RS FNN718A3XW RS
480 18.0 1 1 18 (457) 39 (18) FNN718A11XS RS FNN718A11XW RS
480 18.0 3 1 18 (457) 39 (18) FNN718A5XS RS FNN718A5XW RS
240 23.0 1 3 20
240 23.0 3 3 20
480 23.0 1 1 20
480 23.0 3 1 20
240 27.0 1 3 25
240 27.0 3 3 25
480 27.0 1 3 25
480 27.0 3 1 25
240 36.0 3 3 33 (838) 48 (22) FNN733A3XS RS FNN733A3XW RS
480 36.0 1 3 33 (838) 48 (22) FNN733A11XS RS FNN733A11XW RS
480 36.0 3 1 33 (838) 48 (22) FNN733A5XS RS FNN733A5XW RS
240 45.0 3 3 40
480 45.0 1 3 40
480 45.0 3 3 40
240 54.0 3 3 48 (1219) 60 (28) FNN748A3XS RS FNN748A3XW RS
480 54.0 1 3 48 (1219) 60 (28) FNN748A11XS RS FNN748A11XW RS
480 54.0 3 3 48 (1219) 60 (28) FNN748A5XS RS FNN748A5XW RS
General Purpose and
Moisture Resistant
7 in.
(178 mm)
8 in. O.D.
(203 mm)
Thermowell
4 in. (102 mm) Cold (Ref.)
“B”
0.475 in. (12.1 mm) Dia. Element
① The number and size of the conduit opening will comply with the
National Electrical Code® standards.
“B” Dim.
in. (mm)
1
/2 (343) 35 (16) FNN713J10XS RS FNN713J10XW RS
1
/2 (343) 35 (16) FNN713J3XS RS FNN713J3XW RS
1
/2 (343) 35 (16) FNN713J11XS RS FNN713J11XW RS
1
/2 (343) 35 (16) FNN713J5XS RS FNN713J5XW RS
1
/2 (521) 42 (19) FNN720J10XS RS FNN720J10XW RS
1
/2 (521) 42 (19) FNN720J3XS RS FNN720J3XW RS
1
/2 (521) 42 (19) FNN720J11XS RS FNN720J11XW RS
1
/2 (521) 42 (19) FNN720J5XS RS FNN720J5XW RS
1
/2 (648) 45 (21) FNN725J10XS RS FNN725J10XW RS
1
/2 (648) 45 (21) FNN725J3XS RS FNN725J3XW RS
1
/2 (648) 45 (21) FNN725J11XS RS FNN725J11XW RS
1
/2 (648) 45 (21) FNN725J5XS RS FNN725J5XW RS
1
/2 (1029) 53 (24) FNN740J3XS RS FNN740J3XW RS
1
/2 (1029) 53 (24) FNN740J11XS RS FNN740J11XW RS
1
/2 (1029) 53 (24) FNN740J5XS RS FNN740J5XW RS
Ship Wt.
lbs (kg)
Notes: • All flange bundles are designed to fit the inside diameter
of the equivalent standard schedule pipe
• For ANSI flange dimensions, reference chart on page 241
Part
Number Del.
General Purpose Enclosure
Part
Number
Moisture-Resistant Enclosure
4¾ in. O.D.
(121 mm)
Del.
257
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