Backer Hotwatt Immersion Heaters
Eagle Sensors & Controls is an authorized Backer Hotwatt distributor. Contact us with sales and application support.
Cartridge-and-ImmersionImmersion 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
- Welded end.
- Mica.
- Magnesium oxide packing.
- Element wire situated in close proximity to outside surface for maximum heat transfer and minimum internal temperature while preserving good dielectric qualities.
- Series 316 stainless steel sheath.
- Mounting bushing.
- Ceramic cap.
- 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
SF25B: Coupling Head
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Stainless Steel Bushings
SF25C: Single
SF25D: Coupling Head
* 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″
Available on: 1/4″ to 1″ diameter.
SF13B: Moisture resistant box.
Mounted on NPT coupling head fitting.
Available on: 3/8″ to 1 1/4″ diameter.
SF13C: Explosion resistant box.
Mounted on NPT coupling head fitting
Available on: 3/8″ to 1 1/4″ diameter.
SF13D: General purpose box.
NEMA No.1. Rust resistant steel 4″octagonal
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.
SF27: Stainless steel riser and support feet for over the side immersion heaters. Consult factory for availability.
XS76: Straight thread with nut. Specify thread size and if bushing is to be standard (hex outside vessel) or inverted (hex inside vessel)
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.