Fay Industrial Immersion Heaters

Our “FI” range of Industrial Immersion Heaters are designed and built for ease of installation, safety, reliability and easy maintenance even in difficult conditions.

Our Fay Industrial Immersion Heaters are the ideal replacement to your application.

Fay Industrial Immersion Heaters

Industrial Immersion Heaters and where to start

Industrial Immersion heaters are primarily used for water heating however there are many other materials that need an immersed heater. With over 40 years of experience, crafting heaters to perform in a wide variety of environments, we can assist in selecting the most appropriate design for your particular application.

Industrial heaters are generally larger, more powerful and more robust than their domestic counterparts. They are assembled from high quality heating elements and heavy duty components as they will typically be required to work under heavier loads.

FI Immersions


Fay Industrial commercial grade replacement heating elements are ideal for all commercial liquid heating applications.

Certified as IP67. Any Wattage up to 24kw Single or Three Phase. Any BSP Thread Size.

Standard FI Immersion Heaters are constructed from Incoloy 800 sheathed rod heating elements fitted to a brass screw thread fixing head. Other sheath materials and head (Screw plug) materials are available as an option depending upon your application. Why not browse our guide here.

Fay Industrial Immersion Heater 1.5KW 7" Immersed Length Hooked Pocket Bonded
2.5KW Industrial Immersion Heater Bespoke Left Right Loop

Bespoke manufacturing to your specification is our specialty. We can design and manufacture heating elements within our heaters into many different forms. From U bends to L shapes and Brew Style Hooks, our team can find the best design for your available heating space.

Take a look at our Standard Fits for Industrial Immersion Heaters

Regularly stocked and Ready for Despatch!

Take a look at our size guide below to find the perfect fit for your application.

Size Guide for an FI Immersion Heater. Example drawing with letters as dimensions corresponding to the table below in the image.

BSP Heads

Image showing the various sizes available of the Brass BSP Heads.

A range of BSP thread sizes are available in our FI immersion heaters.

  • 1″
  • 1.25″
  • 1.5″
  • 1.75″
  • 2″
  • 2.25″
  • 2.5″

Available in Brass or 316 Stainless.

Image of a 2.25" Brass Head next to a 2.25" BSP Stainless Head. Both Materials are available in various sizes and can be built in to an FI Immersion Heater.

All thread sizes in the range have standard 86mm (3 3/8″) A/F octagonal brass heads for ease of installation using a standard Immersion Heater Box Spanner , also available to purchase with your heater.

Terminal Covers

Certified to IP67, pressure die-cast aluminium is used to construct the terminal box to withstand the rigours of most industrial environments. Two cable entry M25. Terminal covers can be rotated through 360 degrees to allow cable entry position to be chosen.

FAY Industrial Immersion Terminal Covers IP67 Rated built in as standard.


It is recommended that immersions are accompanied with the correct thermal control for the best performance in your application. We can fit our heaters with single or multiple thermostat pockets, and a full range of thermostats are available to suit most applications.

Our range of industrial and Commercial Immersion Heaters does not include Thermostats. They can be specified separately depending on:

  • Application
  • Industrial Process
  • Utensil Steriliser
  • Domestic Hot-Water systems (Including commercial) compliant to clause 19&22  EN60335-2-73
  • Temperature Range
  • Thermal Accuracy and switching Differential
  • Current Switching Capacity

Remember that the specifics of immersion heaters can vary widely based on factors like the intended application, the fluid or gas being heated, environmental conditions, and safety regulations. It’s important to consult with experts and manufacturers when selecting and installing immersion heaters for your specific industrial processes.