Flanged Immersion Heaters
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Flange Immersion Heaters are constructed by brazing or welding elements into an ANSI or plate flange. These are intended for direct immersion into fluids and gases. The heater is to be installed via a flanged port in the tank or vessel. Flanged Immersion heaters are available in a variety of flange sizes and materials. The heating elements are offered in a number of materials suited to a variety of fluid heating applications. Terminal housings are available for indoor, outdoor (weatherproof NEMA 4) and hazardous (NEMA 7) environments. Many options are available including thermostats, high limit and process thermocouples or RTD sensors. Since we are a made to order company, we can offer a large selection of sizes and configurations which are not listed below. Please contact us for assistance with your application. |
Standard Flange Sizes & Materials
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ANSI Flange Size ANSI Flange Rating Materials |
2" - 24" 150 lb, 300 lb, 600 lb Carbon Steel, Stainless Steel, Titanium |
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Common Sheath Materials
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Copper Steel Stainless Steel Incoloy 800® Inconel 600® Titanium |
Potable Water Fuel Oils, Hydraulic Oils De-Ionized, R-O, Process Water, Mild Acids Water, Mild Alkaline Solutions, Air and Gases Water, Very Alkaline Solutions, High Temperature Air and Gases Sea Water, Very Alkaline Solutions, Some Acid Solutions |
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Built in Thermostat Options
Power Ratings |
Up to 240 volts, 25-amp single pole, single throw (SPST) Up to 240 volts, 25-amp double pole, single throw (DPST) Up to 600 volts, 15-amp triple pole, single throw (TPST) |
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Temperature Ratings |
0 - 100° F 50 - 250° F 160 - 540° F 320 - 700° F |
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Built In Sensor Options
Sensors |
"K" thermocouple for high limit sheath protection and fluid sensing and temperature control. "J" thermocouple for high limit sheath protection and fluid sensing and temperature control. 100 Ohm RTD Sensor for fluid sensing and temperature control. |
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Terminal Housing Options
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3”-150 # ANSI Flanged Heaters |
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| General Purpose Housings NEMA 1 |
Moisture Resistant Housing NEMA 4 |
Hazardous Location NEMA 7 |
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4”-150 # ANSI Flanged Heaters |
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| General Purpose Housings NEMA 1 |
Moisture Resistant Housing NEMA 4 |
Hazardous Location NEMA 7 |
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5”-150 # ANSI Flanged Heaters |
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| General Purpose Housings NEMA 1 |
Moisture Resistant Housing NEMA 4 |
Hazardous Location NEMA 7 |
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6”-150 # ANSI Flanged Heaters |
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| General Purpose Housings NEMA 1 |
Moisture Resistant Housing NEMA 4 |
Hazardous Location NEMA 7 |
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8”-150 # ANSI Flanged Heaters |
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| General Purpose Housings NEMA 1 |
Moisture Resistant Housing NEMA 4 |
Hazardous Location NEMA 7 |
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Non-Standard Flange Options / Designs |
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| Square Flange Available in various sizes |
Round Flange Available in various diameters |
Pipe Insertion Available in various diameters |

Email for product information / pricing: protherm@comcast.net