Immersion Heater Components

Find the correct immersion heater components for Heatrae Sadia, Baxi and compatible hot water systems. This category brings together the core parts required to maintain, repair, or upgrade immersion heating systems used in domestic and commercial cylinders. From heating elements and thermostats to complete element plate assemblies, every component is selected for compatibility, safety, and long-term reliability.

All parts supplied by Heatraq are sourced directly from trusted manufacturers and designed to meet UK compliance standards. Whether you’re diagnosing a fault, replacing a failed component, or carrying out planned maintenance, our range supports installers, facilities teams, and informed homeowners with dependable, genuine replacement parts.

Shop by component type:

Not sure what you need? Start with Immersion Thermostats for temperature issues, Immersion Heaters for no-hot-water faults, or a Plate Assembly if the fixing plate is corroded or you want a complete swap.

Frequently Asked Questions: Immersion Heater Components

What are immersion heater components and which parts might need replacing?

Immersion heater components include key parts such as the heating element, thermostat and element plate assembly. If your hot water system isn’t working correctly, one of these parts may be faulty and require replacement to restore normal operation.

Why is my immersion heater not working and which part should I check first?

If your immersion heater is not working, the most common causes are a failed thermostat, a burnt-out heating element or a faulty element plate assembly. Identifying the correct component depends on symptoms such as no hot water, overheating or inconsistent temperatures.

How do I know if my immersion heater thermostat is faulty?

A faulty thermostat may cause water to overheat, fail to heat at all or trip the safety cut-out. If your system resets but continues to fail, replacing the immersion heater thermostat is often the solution.

What are the signs of a failed immersion heater element?

A failed immersion heater element typically results in no hot water or very slow heating. In hard water areas, limescale build-up can also reduce efficiency and lead to element failure over time.

What is an immersion heater element plate assembly?

An immersion heater element plate assembly is a complete unit that combines the heating element and thermostat into one component. These are commonly used in modern cylinders and are ideal when replacing multiple faulty parts in one repair.

Is it better to replace a single part or a complete immersion heater assembly?

In some cases, replacing a single component such as a thermostat is sufficient. However, if multiple parts are worn or failing, a complete element plate assembly can be a more reliable and cost-effective long-term solution.

Can I buy an immersion heater repair kit or complete replacement parts?

Yes — many immersion heater repairs can be completed using replacement components or complete assemblies. Choosing the right option depends on the fault and whether one or multiple parts need replacing.

How do I identify the correct immersion heater component for my system?

You can identify the correct component by checking your cylinder model, part number or specifications such as length, wattage and connection type. If you're unsure, our team can help you find the correct immersion heater part quickly.

Do you supply immersion heater components for older or discontinued systems?

Yes — we supply a wide range of immersion heater components, including parts for older and discontinued systems where available. We can also recommend compatible replacements if the original part is no longer manufactured.

Do you offer next day delivery on immersion heater components?

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