Backer Hotwatt Immersion Heaters

Immersion Cartridge Heater resist corrosion.

Eagle Sensors & Controls is an authorized Backer Hotwatt distributor. Contact us with sales and application support.

Cartridge-and-Immersion

Immersion Heaters are a common heating solution that are used to heat a variety of liquids including water, oil, chemicals and inert gases. Hotwatt provides a full line of energy efficient spec and custom manufactured heating elements for a broad variety of heating applications including:

  • Low Watt Density Immersion Heaters
  • Medium Watt Density Immersion Heaters
  • High Watt Density Immersion Heaters
  • Metric Immersion Heaters
  • Square Immersion Heaters
  • Custom Immersion Heaters

Heaters are designed to meet optimal heat transfer for heating liquids to meet low to high temperature needs.

Description

U.L. Recognized – E56973
C.S.A. Certified – 16386-0-000

Features
  • The Backer Hotwatt Immersion Heater may be supplied with various junction boxes for additional terminal or lead protection.
  • For corrosive environments, units can be supplied in other special alloys best suited to the operating conditions.
  • The lead end of the unit may be sealed for extreme environmental conditions.
  • Units may be supplied for three phase or three heat operation.
  • Made in U.S.A.
Construction
  1. Welded end.
  2. Mica.
  3. Magnesium oxide packing.
  4. Element wire situated in close proximity to outside surface for maximum heat transfer and minimum internal temperature while preserving good dielectric qualities.
  5. Series 316 stainless steel sheath.
  6. Mounting bushing.
  7. Ceramic cap.
  8. Flexible stranded nickel alloy insulated leads or rust resistant post terminals.
Standard Immersion Heater

Available Bushings: Must be specified after catalog number.

Brass Bushings
SF25A: Single

sf25a

SF25B: Coupling Head

sf25b

Stainless Steel Bushings
SF25C: Single

sf25c

SF25D: Coupling Head

sf25d

* Wattages are based on a unit operating immersed in water. For heating other materials, see technical information catalog below. View page 148 for Suggested Watt Densities or pages 152-155 for Sheath Materials.

* Lengths between and longer than those listed may be ordered.

1/4″ Diameter
NPT Size: 1/8″
Standard Termination: 6″ Leads (SF1-6)
Maximum Amperage: 3.5
AF: 7/16″ C: 1/2″ D: 3/8″		 3/8″ Diameter
NPT Size: 1/4″
Standard Termination: 6″Leads (SF1-6)
Maximum Amperage: 6.0
AF: 5/8″ C: 9/16″ D: 7/16″
Length
A		 Catalog
Number		 Max.Watt.
in Water		 Length
A		 Catalog
Number		 Max.Watt.
in Water
2″ EM25-2 115 2″ EM37-2 130
3″ EM25-3 185 3″ EM37-3 240
4″ EM25-4 255 4″ EM37-4 345
5″ EM25-5 325 5″ EM37-5 450
6″ EM25-6 395 6″ EM37-6 555
7″ EM25-7 465 7″ EM37-7 660
1/2″ Diameter

NPT Size:

3/8″

Standard Termination:

6″ Leads (SF1-6)

Maximum Amperage:

3.5

AF: 11/16″ C: 5/8″ D: 7/16″

 5/8″ Diameter
NPT Size:

1/2″

Standard Termination:

6″Leads (SF1-6)

Maximum Amperage:

6.0

AF: 7/8″ C: 3/4″ D: 9/16″
Length
A		 Catalog
Number		 Max.Watt.
in Water		 Length
A		 Catalog
Number		 Max.Watt.
in Water
3″ EM50-3 360 3″ EM62-3 430
4″ EM50-4 505 4″ EM62-4 605
5″ EM50-5 635 5″ EM62-5 785
6″ EM50-6 765 6″ EM62-6 1060
7″ EM50-7 895 7″ EM62-7 1135
8″ EM50-8 1030 8″ EM62-8 1310
3/4″ Diameter
NPT Size: 3/4″
Standard Termination: 6″ Leads (SF1-6)
Maximum Amperage: 15
AF: 1 1/8″ C: 7/8″ D: 5/8″		 1″ Diameter
NPT Size: 1″
Standard Termination: 8-32 Screw & Nut(SF3)
Maximum Amperage: 25
AF: 1 1/2″ C: 15/16″ D: 11/16″
Length
A		 Catalog
Number		 Max.Watt.
in Water		 Length
A		 Catalog
Number		 Max.Watt.
in Water
4″ EM75-4 705 5″ EM1.0-5 1195
5″ EM75-5 915 6″ EM1.0-6 1495
6″ EM75-6 1130 7″ EM1.0-7 1795
7″ EM75-7 1340 8″ EM1.0-8 2095
8″ EM75-8 1555 9″ EM1.0-9 2395
9″ EM75-9 1765 10″ EM1.0-10 2695
1 1/4″ Diameter
NPT Size: 1 1/4″
Standard Termination: 10-32 Screw & Nut (SF3)
Maximum Amperage: 30
AF: 1 3/4″ C: 1 1/32″ D: 23/32″		 1.9″ Diameter
NPT Size: 2″
Standard Termination: 6″ Leads (SF1-6)
Maximum Amperage: 40
AF: 2 1/2″ C: 1 7/16″ D: 11/16″
Length
A		 Catalog
Number		 Max.Watt.
in Water		 Length
A		 Catalog
Number		 Max.Watt.
in Water
6″ EM1.2-6 1690 10″ EM1.9-10 4200
7″ EM1.2-7 2145 12″ EM1.9-12 5000
8″ EM1.2-8 2600 16″ EM1.9-16 6700
10″ EM1.2-10 3055 20″ EM1.9-20 8400
11″ EM1.2-11 3280
12″ EM1.2-12 3505 24″ EM1.9-24 10000
14″ EM1.2-14 3960 30″ EM1.9-30 12600
2.3″ Diameter
NPT Size: 2 1/2″
Standard Termination: 6″ Leads (SF1-6)
Maximum Amperage: 50.0
AF: 3″ C: 1 3/4″ D: 7/8″
Length
A		 Catalog
Number		 Max.Watt.
in Water
12″ EM2.3-12 6000
18″ EM2.3-18 9000
24″ EM2.3-24 12000
30″ EM2.3-30 15000
36″ EM2.3-36 18000
42″ EM2.3-42 21000
Termination Enclosure Options

Lengths between or longer than those listed may be ordered.

SF13A: General purpose box.
NEMA No.1. 2 3/4″ x 1 1/2″ x 1 1/2″

sf13a

Available on: 1/4″ to 1″ diameter.

SF13B: Moisture resistant box.
Mounted on NPT coupling head fitting.

sf13b

Available on: 3/8″ to 1 1/4″ diameter.

SF13C: Explosion resistant box.
Mounted on NPT coupling head fitting

sf13c

Available on: 3/8″ to 1 1/4″ diameter.

SF13D: General purpose box.
NEMA No.1. Rust resistant steel 4″octagonal

sf13d

Available on: 1 1/4″ to 2 3/8″ diameter

Standard Immersion Heater

SF26: Stainless steel flange. Mounting hole centers for 1/4″ to 5/8″ diameters is 1 1/8″ and for 3/4″ diameter is 1 5/32″. Special flange sizes available upon request.

sf26

SF27: Stainless steel riser and support feet for over the side immersion heaters. Consult factory for availability.

sf27

XS76: Straight thread with nut. Specify thread size and if bushing is to be standard (hex outside vessel) or inverted (hex inside vessel)

xs76

Voltage
Standard voltages are either 120V or 240V.
Other voltages are available.
Tolerances
Wattage tolerances are held to +5%, -10%
at rated voltage. Length tolerances are ±2%
with a ±1/16″ minimum.