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Screw Plug Immersion Heaters

Screw Plug Heaters are constructed by brazing or welding elements into a hex pipe thread. These are intended for direct immersion into fluids and gases. The heater is to be installed via a threaded port in the tank or vessel. Screw plug heaters are available in a variety of pipe thread 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.

Standard Plug Sizes & Materials

NPT Sizes

British Sizes

Materials

 1″, 1 1/4″, 1 1/2″, 2″, 2 1/2″

1″, 1 1/4″, 1 1/2″, 2″, 2 1/2″

Brass, Steel, Stainless Steel

Common Sheath Materials

Copper

Steel

Stainless Steel

Incoloy 800 ®

Inconel 600 ®

 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

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)
Temperature Ratings 0 – 100° F
50 – 250° F
160 – 540° F
320 – 700° F

Built In Sensor Options

Sensors “K” calibration thermocouple for high limit sheath protection and fluid sensing and temperature control.

“J” calibration thermocouple for high limit sheath protection and fluid sensing and temperature control.

100 Ohm RTD Sesnor for fluid sensing and temperature control.

Terminal Housings and Constructions

1″ NPT Screw Plug Immersion Heaters
screwplug_02General Purpose Housings
No Thermostat		 screwplug_03General Purpose Housings
Built In Thermostat		 screwplug_04NEMA 4/NEMA 7 Housings
No Thermostat
screwplug_05NEMA 4/NEMA 7 Housings
Built In Thermostat SPST

1 1/4″ Screw Plug Immersion Heaters
screwplug_06General Purpose Housings
No Thermostat
Single Element Design		 screwplug_07General Purpose Housings
Built In Thermostat
Dual Element Design		 screwplug_08NEMA 4/NEMA 7 Housings
No Thermostat
screwplug_09NEMA 4/NEMA 7 Housings
Built In Thermostat SPST

2″ Screw Plug Immersion Heaters (2 Elements, Single Phase)
screwplug_10General Purpose Housings
No Thermostat		 screwplug_11General Purpose Housings
Built In Thermostat
screwplug_12NEMA 4/NEMA 7 Housings
No Thermostat		 screwplug_13NEMA 4/NEMA 7 Housings
Built In Thermostat SPST

2″ Screw Plug Immersion Heaters (3 Elements, Single or Three Phase)
screwplug_14General Purpose Housings
No Thermostat		 screwplug_15General Purpose Housings
No Thermostat
screwplug_16NEMA 4/NEMA 7 Housings
No Thermostat		 screwplug_17NEMA 4/NEMA 7 Housings
Built In Thermostat SPST

2 1/2″ Screw Plug Immersion Heaters (3 Elements, Single or Three Phase)
screwplug_18General Purpose Housings
No Thermostat		 screwplug_19General Purpose Housings
Built In Thermostat
screwplug_20NEMA 4/NEMA 7 Housings
No Thermostat		 screwplug_21NEMA 4/NEMA 7 Housings
Built In Thermostat SPST
screwplug_22NEMA 4/NEMA 7 Housings
Built In Thermostat 480/600 VAC TPST
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