Electric Immersion heaters are heating elements used to directly heat liquids found in a variety of industries from process heating, power, chemical, oil and gas, pharmaceuticals, metals processing to the food & beverage industry.
Durex Industries has over 40 years of experience in the application, design, and manufacture of robust immersion tank heaters and process assemblies for immersion heating applications.
Electric Immersion Heaters from Durex Industries
Our screw plug, flange, and over-the-side immersion heaters are designed to provide a quick and efficient way to reach and maintain required temperatures to prevent liquids from freezing in colder conditions, maintain production flow at a constant temperature, provide precise heat distribution, and allow fluids to transfer effectively.
Durex immersion heaters are constructed from hairpin bent tubular heating elements brazed or welded into threaded screw plugs or flanges and typically inserted horizontally through the side of a tank or vessel directly into the fluid.
Using direct heating allows for the fluid to quickly reach the desired temperature and ensure optimized high performance results.
Contact Durex Industries for Immersion heating
We have thousands of standard designed immersions heaters for quick field replacements and convenient ordering. Durex also has extensive experience with custom designed electric immersion heaters for storage tanks, reservoirs, and circulation flow applications.
Buy screw plug immersion heater standard designs directly from our online store. Quick ship!
Buy flange immersion heater standard designs directly from our online store.
Industrial tubular immersion heating elements are used for direct liquid heating applications. They are constructed of one or more heater elements brazed or welded into various types of mounting fittings. Standard and custom engineered electric heater designs are available for tailored solutions to your thermal application requirements.
Request a quote or contact us for assistance.
The goal is to optimize the heater configuration to ensure the longest life possible while minimizing overall product and life cycle costs. The general temperature, sheath material and watt density guidelines below can aid in proper heater selection for some common liquids. Contact Durex for further assistance.
|Liquid||Max. Operating Temps °F (°C)||pH Level and/or Concentration||Recommended Sheath Material||Typical Plug Material||Max. Watt Density W/in2(W/cm2)|
|Clean, Potable Water
||212 (100)||Neutral (pH 6 to 8)||Copper||Brass||60-90 (9.5-14)|
|Process Water & Weak Solution||212 (100)||pH 5 to 9; 2-3%||Incoloy®, 304SS||Steel or 304SS||48 (7.5)|
|Demineralized, Deionized Water||212 (100)||Neutral||304SS or 316SS (passivated)||304SS or 316SS||60 (9.5)|
|Weak (Acidic) Solutions*||210 (100)||Up to 5-6%||Incoloy®, 316SS||Steel||48 (7.5)|
|Mildly Corrosive (Acidic) Solutions*||180 (80)||5-15%||Incoloy®, 316SS||304SS or 316SS||20-30 (3.5)|
|Severely Corrosive (Acidic) Solutions*||180 (80)||>15%||Incoloy®, titanium, Teflon®||304SS or other||15-16 (2.5)|
|Caustic Soda 10%||200 (100)||pH 14; 10%||Incoloy®||Steel||20-23 (3.5)|
|Caustic Soda 50%||250 (120)||pH 14; 50%||Incoloy®||Steel||16 (2.5)|
|Fuel Oil 1 & 2; Kerosene Lube Oil SAE 10 to 30||200-250 (95-120)||-||Steel||Steel||20-23 (3.5)|
|Fuel Oil 4 & 5; Lube Oil SAE 40 to 50||200-250 (95-120)||-||Steel||Steel||15-16 (2.5)|
|Fuel Oil 6 & Bunker C||160 (70)||-||Steel||Steel||6-8 (1.2)|
|Hydraulic Oil||100 (40)||-||Steel||Steel||15-16 (2.5)|
|Ethlyene Glycol||300 (150)||-||Steel||Steel||23-30 (3.5-4.5)|
|Glycerine||500 (260)||-||Incoloy®||Steel||8-10 (1.5)|
|Molton Salt Bath||800 (425)||-||Steel, 321SS, Monel®||Steel||23-30 (3.5-4.5)|
|Paraffin Wax||150 (65)||-||Steel or 304SS||Steel||15-16 (2.5)|
|Molasses||100 (40)||-||304SS or 316SS||304SS||4-5 (0.7)|
* Sheath material and watt density dependent on type of acid, concentration, temperature, aeration, movement, etc.
- Please note that the user accepts full responsibility for validating that a heater is suitable for a given liquid or gas heating application.
- Ensure that heater elements are completely covered in liquid AT ALL TIMES. Failure to do so may cause the heater elements to operate in open air and fail prematurely, or worse, lead to ignition of flammable vapor mixtures, causing serious personal injury and equipment damage. Liquid level sensors are highly recommended.
- Durex recommends the use of a thermostat or process controller as well as a high limit sensor and FM approved safety controller to prevent unexpected over temperature conditions.
Typical Heating Applications
Pharmaceuticals, Food and Beverage Industries:
- Batch processing
- Brew kettles
- Heat transfer systems and reactors
- Milking & dairy systems
- Packaging equipment
- Spray dryers and drying systems
- Transfer lines
Oil, Gas, Petrochem, Chemical Industries:
- Air dryers
- Heat transfer systems
- Lube and pump systems
- Process gas heating
- Process plants
- Storage Tanks
- Waste Oil
- Fuel gas and fuel oil heating
- Flue gas and ESP heating
- Storage Tanks
- Water wash systems
Primary and Secondary Metals Processing:
- Heat transfer systems
- Heat treat baths
- Primary and secondary metals furnaces
- Quick ship on standard immersion heater designs
- Standard and custom designed immersion heaters
- C-UL heating element component recognition available
- ASME Section VIII Div 1 manufacturer with “R” stamp capability
- CSA hazloc certified terminal enclosures available
Considerations When Selecting a Type of Immersion Heater
Choosing the right type of immersion heater for your application is important. The goal is to optimize the heater configuration to ensure the longest life possible while minimizing overall product and life cycle costs.
Durex Industries’ team of engineers will assist you in providing the best and most efficient heating solution required for you application.
Consider the below factors when ordering your immersion heater:
- Hazardous location installation
- Voltage rating, phase and kW power rating
- Available Amps at site of installation
- Time required to reach desirable temperature setting
- Temperature control and sensing scheme
- Quantity of liquid being heated and if flowing or mixing
- Viscosity and thermal conductivity of the fluid
- Corrosive nature of the fluid
- Tank or heating vessel insulation thickness and type
- Space limitations for installation or heater removal
- Outdoor or indoor installation
- Ambient environment operating conditions
Engineered Thermal Solutions
Process Heater Brochure PROC-BROC-0912- 7MB
National Board Certificate - 114KB