Immersion Heaters

Genuine Immersion Heaters for Hot Water Cylinders

Shop genuine immersion heaters for domestic and commercial hot water systems. Our range includes replacement immersion heaters from Heatrae Sadia and Baxi, with Copper (Gold Dot), Incoloy, Superloy and Titanium elements available to suit different water conditions and applications.

Whether you're replacing a failed immersion heater, maintaining a Megaflo cylinder or upgrading to a more corrosion-resistant element, you'll find a wide selection of lengths, wattages and thermostat configurations to match your system. From standard 11" immersion heaters through to 36" models and Economy 7 elements, Heatraq supplies genuine replacement parts with expert support and fast UK delivery.

Choosing the Right Immersion Heater

Selecting the correct immersion heater is essential for reliable hot water performance and long service life. Before ordering, it's important to check the immersion heater length, power rating, thermostat type and element material to ensure compatibility with your hot water cylinder.

Immersion heaters are commonly available in lengths including:

  • 11" immersion heaters
  • 14" immersion heaters
  • 27" immersion heaters
  • 30" immersion heaters
  • 36" immersion heaters

Using the correct length helps ensure efficient heat distribution throughout the cylinder and prevents compatibility issues during installation.

If you're unsure which size you need, read our guide:

What Length Immersion Heater Do I Need? 11", 14", 27" & 36" Explained

Understanding Immersion Heater Materials

The material of the heating element can significantly affect durability and performance.

Copper (Gold Dot)

Copper immersion heaters remain one of the most popular choices for standard domestic hot water cylinders. They offer reliable performance and are suitable for many installations where water conditions are not particularly aggressive.

Incoloy

Incoloy immersion heaters provide improved resistance to limescale build-up and are often recommended for hard water areas where standard elements may suffer reduced efficiency over time.

Superloy

Superloy immersion heaters are designed to provide enhanced corrosion resistance and are commonly used where water conditions are more demanding.

Titanium

Titanium immersion heaters offer the highest level of corrosion resistance and are often selected for aggressive water conditions, renewable energy systems and applications where maximum lifespan is required.

For a full comparison, read our guide:

Copper, Incoloy, Superloy & Titanium Immersion Heaters Compared

Common Signs an Immersion Heater Needs Replacing

A faulty immersion heater can cause a range of hot water issues, including:

  • No hot water
  • Water not reaching temperature
  • Repeated tripping of the electrical supply
  • Slow cylinder recovery times
  • Visible corrosion or scaling
  • Faulty thermostat operation

In many cases, replacing the immersion heater or thermostat can restore normal operation without replacing the entire cylinder.

Why Buy Immersion Heaters from Heatraq?

At Heatraq, we specialise in genuine hot water heating components from trusted manufacturers including Heatrae Sadia and Baxi. Our range includes immersion heaters for Megaflo cylinders, Economy 7 systems and traditional hot water cylinders, helping installers, engineers and homeowners source the correct replacement quickly and confidently.

With expert technical support, fast UK delivery and an expanding range of genuine parts, we're committed to helping keep your hot water system operating efficiently.

Immersion Heaters (Elements) FAQs

What is an immersion heater element and how does it work?

An immersion heater element is the component inside a hot water cylinder that heats the water directly using electricity. It sits inside the tank and transfers heat into the water, providing hot water independently of a boiler system.

Why is my immersion heater not heating water?

If your immersion heater is not heating water, the most common cause is a failed heating element. Other possible issues include a faulty thermostat, power supply problems or a tripped safety cut-out.

How do I know if my immersion heater element is broken?

Signs of a faulty immersion heater element include no hot water, water taking much longer to heat, or inconsistent temperatures. In many cases, the element has burned out and needs replacing.

Can I replace just the immersion heater element?

Yes — in many systems, you can replace just the immersion heater element without changing the thermostat. This is a cost-effective repair if the thermostat is still working correctly.

What size immersion heater element do I need?

Immersion heater elements come in different lengths and wattages, typically 11", 14" and 27", with common power ratings such as 3kW. Choosing the correct size depends on your cylinder type and application.

What is the difference between copper and Incoloy immersion heater elements?

Copper immersion heater elements are commonly used in soft water areas, while Incoloy elements are more resistant to limescale and are better suited for hard water conditions. Choosing the right material can improve lifespan and performance.

Can limescale damage an immersion heater element?

Yes — in hard water areas, limescale can build up on the immersion heater element, reducing efficiency and eventually causing the element to fail. Using the correct element type helps minimise this issue.

How long does an immersion heater element last?

The lifespan of an immersion heater element depends on usage and water conditions. In hard water areas, elements may need replacing more frequently due to limescale build-up.

Do you supply immersion heater elements for Megaflo and other cylinders?

Yes — we supply immersion heater elements compatible with a wide range of cylinders, including popular systems like Megaflo and other unvented hot water cylinders.

Do you offer next day delivery on immersion heater elements?

Yes — we offer next working day delivery on immersion heater elements for orders placed before 2pm, helping you restore hot water quickly.