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45 years of trusted expertiseImmersion Heating Elements & Thermostats
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Source reliable immersion heating elements and replacement thermostats for both vented and unvented domestic hot water cylinders. Our range includes standard copper and Incoloy elements suited to varying water hardness levels.
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Replacing a failed immersion element or faulty thermostat is a routine task for heating engineers and plumbers, requiring components that ensure long-lasting performance and regulatory compliance. Our selection covers multiple boss sizes, element lengths, and wattage ratings to fit standard copper domestic cylinders as well as modern unvented systems. For areas with hard water or high limescale concentration, Incoloy and titanium elements provide superior resistance to corrosion compared to standard copper alternatives, helping to reduce the frequency of premature element failures and costly callouts. Combined with dual-safety thermostats featuring high-limit manual resets, these components ensure safe and efficient water heating for your customers. Whether you are stocking up for future jobs or sourcing a part for an emergency repair, you can rely on our free Click & Collect service available in as little as five minutes from over 350 branches nationwide.
Frequently Asked Questions
Should I install a copper or Incoloy immersion heater?
The choice depends entirely on the local water hardness at the property. Standard copper elements are suitable for soft water areas, but in hard water regions, limescale build up will quickly cause a copper element to overheat and split. Incoloy or titanium immersion heaters are heavily recommended for hard water areas because the alloy materials resist corrosion and scale far better, ensuring a much longer operational lifespan.
What size immersion element do I need for a standard domestic cylinder?
The correct element length is determined by the size and orientation of the hot water cylinder. A standard 36-inch domestic cylinder typically requires a 27-inch immersion heater if installed vertically from the top, ensuring the water is heated evenly from the bottom up. For side-mounted elements usually found on shorter or horizontally oriented cylinders, a shorter 11-inch or 14-inch element is required to prevent the heater from touching the opposite wall of the tank.
Do replacement immersion thermostats require a manual reset?
Yes, modern UK regulations mandate that any replacement immersion thermostat fitted to an unvented cylinder must feature a high-limit thermal cut-out with a manual reset function. This is a critical safety requirement that shuts off the power to the element if the primary thermostat fails, preventing the water from boiling and causing dangerous pressure build up within the cylinder.