Selecting an Immersion Heater
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Compact Screw-Plug Immersion Heaters for Water


Rapidly heat water in small containers to prevent freezing or generate steam. Compact in size, these heaters fit in openings that are 1 ¼ NPT or smaller. With a high-watt density, they heat liquids up quickly. Inside the sheath is a heating element made of Incoloy or 316 stainless steel that won’t corrode when exposed to water and moisture.
Both ends of the fitting are threaded, so one side fits into your tank and the other can be threaded into conduit to protect the wiring. For the most even heat distribution, choose the largest length of heater that will fit in your container. All require a temperature switch or controller (sold separately) to regulate the heat output and power the heater.
Note: Fully immerse the heating element in liquid to prevent heater failure.
For technical drawings and 3-D models, click on a part number.
Heating Element | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Wattage, W | Watt Density, W/sq. in. | Current, A | Lg. | Wd. | Material | Pipe Size | Thread Type | Gender | Wire Lead Lg. | Body Material | Each | |
120V AC, Single Phase | ||||||||||||
55 | 47 | 0.4 | 1 5/8" | 1/4" | 316 Stainless Steel | 1/8 | NPT | Male | 6" | 316 Stainless Steel | 0000000 | 0000000 |
75 | 43 | 0.63 | 1 9/16" | 3/8" | 316 Stainless Steel | 1/4 | NPT | Male | 6" | 316 Stainless Steel | 0000000 | 000000 |
100 | 85 | 3.5 | 1 5/8" | 1/4" | 316 Stainless Steel | 1/8 | NPT | Male | 6" | 316 Stainless Steel | 00000000 | 000000 |
120 | 68 | 6 | 1 9/16" | 3/8" | 316 Stainless Steel | 1/4 | NPT | Male | 6" | 316 Stainless Steel | 00000000 | 000000 |
170 | 48 | 1.42 | 4 5/8" | 1/4" | 316 Stainless Steel | 1/8 | NPT | Male | 6" | 316 Stainless Steel | 0000000 | 000000 |
200 | 40 | 10 | 2 7/16" | 5/8" | 316 Stainless Steel | 1/2 | NPT | Male | 6" | 316 Stainless Steel | 00000000 | 000000 |
250 | 47 | 2 | 4 9/16" | 3/8" | 316 Stainless Steel | 1/4 | NPT | Male | 6" | 316 Stainless Steel | 0000000 | 000000 |
300 | 85 | 3.5 | 4 5/8" | 1/4" | 316 Stainless Steel | 1/8 | NPT | Male | 6" | 316 Stainless Steel | 00000000 | 000000 |
325 | 61 | 6 | 5 9/16" | 3/8" | 316 Stainless Steel | 1/4 | NPT | Male | 6" | 316 Stainless Steel | 00000000 | 000000 |
400 | 81 | 10 | 2 7/16" | 5/8" | 316 Stainless Steel | 1/2 | NPT | Male | 6" | 316 Stainless Steel | 00000000 | 000000 |
405 | 47 | 3.3 | 4 7/16" | 5/8" | 316 Stainless Steel | 1/2 | NPT | Male | 6" | 316 Stainless Steel | 0000000 | 000000 |
700 | 79 | 10 | 4 7/16" | 5/8" | 316 Stainless Steel | 1/2 | NPT | Male | 6" | 316 Stainless Steel | 00000000 | 000000 |
800 | 49 | 6.7 | 5 1/4" | 1" | 316 Stainless Steel | 1 | NPT | Male | 6" | 316 Stainless Steel | 000000 | 000000 |
1,200 | 53 | 10 | 7 3/4" | 1" | 316 Stainless Steel | 1 | NPT | Male | 6" | 316 Stainless Steel | 000000 | 000000 |
1,750 | 50 | 14.6 | 11 1/4" | 1" | 316 Stainless Steel | 1 | NPT | Male | 6" | 316 Stainless Steel | 000000 | 000000 |
480V AC, Single Phase | ||||||||||||
1,800 | 50 | 3.8 | 9 1/4" | 1 1/4" | 316 Stainless Steel | 1 1/4 | NPT | Male | 6" | 316 Stainless Steel | 0000000 | 000000 |
3,000 | 54 | 6.3 | 14 1/4" | 1 1/4" | 316 Stainless Steel | 1 1/4 | NPT | Male | 6" | 316 Stainless Steel | 0000000 | 000000 |
Compact Screw-Plug Immersion Heaters for Oil and Coolant


Heat oil or coolant inside small containers to reduce the viscosity of the liquid and improve flow. These heaters fit in compact openings that are 1 NPT or smaller. With a low-watt density, these heaters operate efficiently and won’t burn out when used with a wide range of oils and coolants. The heating element is made of stainless steel, so it resists corroding when exposed to chemicals.
Both ends of these heaters are threaded, so one side fits into your tank and the other can be threaded into a conduit to protect the wiring. For the most evenly distributed heating, choose the largest length of heater that will fit in your container. To control the settings of the heater, they must be connected to a temperature switch or controller (required but not included).
Note: Fully submerge the heating element in liquid to prevent heater failure.
For technical drawings and 3-D models, click on a part number.
Heating Element | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Wattage, W | Watt Density, W/sq. in. | Current, A | Lg. | Wd. | Pipe Size | Thread Type | Gender | Wire Lead Lg. | For Use With | Each | |
316 Stainless Steel Heating Element with 316 Stainless Steel Body | |||||||||||
120V AC, Single Phase | |||||||||||
25 | 20 | 3.5 | 1 5/8" | 1/4" | 1/8 | NPT | Male | 6" | Ethylene Glycol, Hydraulic Oil, Propylene Glycol, Water | 0000000 | 0000000 |
35 | 20 | 6 | 1 9/16" | 3/8" | 1/4 | NPT | Male | 6" | Ethylene Glycol, Hydraulic Oil, Propylene Glycol, Water | 0000000 | 000000 |
70 | 20 | 3.5 | 4 5/8" | 1/4" | 1/8 | NPT | Male | 6" | Ethylene Glycol, Hydraulic Oil, Propylene Glycol, Water | 0000000 | 000000 |
100 | 20 | 6 | 4 9/16" | 3/8" | 1/4 | NPT | Male | 6" | Ethylene Glycol, Hydraulic Oil, Propylene Glycol, Water | 0000000 | 000000 |
100 | 20 | 10 | 2 7/16" | 5/8" | 1/2 | NPT | Male | 6" | Ethylene Glycol, Hydraulic Oil, Propylene Glycol, Water | 0000000 | 000000 |
165 | 20 | 15 | 3 3/8" | 3/4" | 3/4 | NPT | Male | 6" | Ethylene Glycol, Hydraulic Oil, Propylene Glycol, Water | 0000000 | 000000 |
215 | 20 | 10 | 5 7/16" | 5/8" | 1/2 | NPT | Male | 6" | Ethylene Glycol, Hydraulic Oil, Propylene Glycol, Water | 0000000 | 000000 |
285 | 20 | 25 | 4 5/16" | 1" | 1 | NPT | Male | 6" | Ethylene Glycol, Hydraulic Oil, Propylene Glycol, Water | 0000000 | 000000 |
300 | 20 | 15 | 6 3/8" | 3/4" | 3/4 | NPT | Male | 6" | Ethylene Glycol, Hydraulic Oil, Propylene Glycol, Water | 0000000 | 000000 |
470 | 20 | 25 | 7 5/16" | 1" | 1 | NPT | Male | 6" | Ethylene Glycol, Hydraulic Oil, Propylene Glycol, Water | 0000000 | 000000 |