Non-Hazardous Flanged Immersion Heaters

Indeeco’s ESI series flanged immersion heaters offer the simplest installation available with our unique enclosure design. Each flanged immersion heater is uniquely designed for its specific application. Our sales and engineering staff will work closely with you to understand your application and offer a solution that is engineered specifically for your needs.

Need it quick? Take advantage of our FastTrack shipping program which is available on most heater designs.


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Standard Features

Wattages up to two megawatts

Watt densities up to 100 w/in2

Voltages up to 600V

Process temperatures up to 1,200°F

Multiple flange and element materials

Flange sizes up to 36″ and 2500# ASME B16.5

Removable and rotatable general purpose enclosure for easy pairing of incoming power feed.

Weatherproof enclosure offers multiple flat surfaces for the addition of connection hubs.

Weatherproof enclosures are constructed of stainless steel providing corrosion resistance

ANSI B16.5 150# or 300# flange 2″ up to 36″

Designed to fit into schedule 40 or schedule STD pipe for the given flange size

Flange material A105 carbon stl, A182 304/304L or 316/316L stainless steel

Elements sheath materials available; steel, 304 SST, 316 SST, 321 SST, incoloy 800, incoloy 840, copper

Epoxy or RTV sealed heating elements to prevent moisture absorption

Stainless steel welded bussing to eliminate loose connections

Heater circuits divided into 48A max as default

Heavy duty, low pressure drop design, 304 SST element support spacers provided on 24″ centers

Spacer support rods provided on 10″ and larger flange sizes

General purpose, weather proof, or explosion-proof terminal enclosure

Lifting lugs for heaters 4″ and larger

Nitrile bonded fiber, or SST/graphite spiral flange gasket provided as standard

Certifications – cCSAus certified and UL Recognized for general purpose and weatherproof constructions. (per CSA 22.2 no. 72 and 88 / UL574 for Oil / UL1030 or UL499 for water or air)

Optional Features

Extended terminal box
Provided when the heater is operating above 500° F to allow for cooler operation of the terminal box. This allows the heating elements to be sealed with epoxy or RTV and for the customer to provide incoming wire with a much lower insulation temperature rating.

The heater can be supplied in accordance with ASME section VIII Div. 1 U-Part stamped and certified.

Bulb and capillary pilot duty or load carrying thermostats can be provided to control the heater or to provide over-temperature protection. The thermostat bulb can be installed in a thermowell to sense process or element sheath temperature.

Type J or K thermocouples can be provided to monitor the process or element sheath temperatures. Thermocouples provided with a ceramic wafer head and screw terminals for ease of wiring. Alternate type E or T available but not FastTrack eligible.

Hermetically sealed element terminations
A ceramic to metal soldered seal can be provided to eliminate the possibility of moisture from entering the heating element.

Removable bussing
Allows troubleshooting and isolation of a failed heating element.

Construction utilizes alternating half baffles spaced closely to cause increased flow velocity across the heating elements to allow better heat transfer from the elements to the fluid.

Ventilated general purpose cover
Provides means for heat to exhaust from the terminal box to minimize heat buildup.

Add support rods for flange sizes 8” and smaller
Support rods can be added to high flow heaters to keep the element support spacers in place.

Larger heater circuits for greater than 48A per circuit

Heavy wall pipe design
Element bundles with smaller outside diameter can be provided for any flange size requested.

Pickle and Passivate
A chemical treatment in nitric acid can be performed to remove free iron from the outer surface of stainless steel for applications sensitive to contaminants.

Is a process similar to plating using cathode and anode reactions but material is removed rather than added to the heater surfaces in order to provide a clean and bright finish.

Ring and cover weatherproof or corrosion resistant enclosures
Heavy duty pipe and plate construction.

Other element sheath and flange materials available

Flange ratings greater than 300# are available up to 2500#


Water heating

Industrial rinse tanks

Vapor degreasers

Hydraulic oil, crude, asphalt

Lubricating oils


Caustic solutions

Chemical baths

Boiler equipment

Glycol solutions


Closed Tank Heating

Watt Density

Percentage of Wattage

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