Parts by Type

Find the right replacement component by selecting the type of part you need. Browse genuine water heater and hot water system parts, including immersion heaters, thermostats, valves, electrical controls, expansion vessels, gaskets and seals.

If you know the original part number or appliance model, use it to confirm compatibility before ordering. If you are unsure, Heatraq can help you identify the correct replacement.

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Three Ways to Find the Correct Part

  • A circular icon featuring a dark navy magnifying glass over a dark navy barcode card with white text reading 'PART NO. 12345' and an orange checkmark, on a white background.

    Check the Part Number

    Use the reference printed on the original component wherever possible. A similar appearance alone does not confirm compatibility.

  • A flat vector icon showing a blue rectangular device with a magnifying glass over it, on a plain white background.

    Identify the Appliance

    Record the manufacturer, complete model, capacity, electrical rating and serial number from the appliance data label.

  • A simple line icon of an open envelope with a speech bubble, where the flap is filled with a solid orange color on a white background.

    Ask Heatraq

    Not sure which part you need? Send us clear photographs of the appliance label and existing component before ordering.

    Contact Heatraq 

Find Water Heater Spare Parts by Component Type

Water heaters, cylinders and hot water systems contain a combination of electrical, mechanical and hydraulic components. When a fault develops, identifying the type of component involved can help narrow your search for the correct replacement.

The Heatraq Parts by Type hub brings together genuine and manufacturer-approved components for domestic and commercial hot water appliances. Browse immersion heater components, valves, electrical controls, expansion vessels, gaskets and seals without needing to know the appliance range first.

Parts that look similar are not necessarily interchangeable. Always check the original part number, appliance model, electrical rating, pressure setting, dimensions and documented compatibility before ordering.

Element on a grey background

Immersion Heater Components

Browse replacement immersion heaters, thermostats and complete element plate assemblies for water heaters, hot water cylinders and storage appliances.

Before ordering, check the original part number, element length, power rating, connection size and appliance compatibility. Similar-looking components may have different specifications and are not always interchangeable.

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Valves

Browse replacement valves for water heaters, unvented cylinders and hot water systems, including safety and relief valves, pressure-reducing valves, mixing valves, isolation valves and water control components.

Always match the original part number, pressure and temperature ratings, connection size and appliance compatibility. Safety-critical valves must be replaced with the correct specification rather than chosen by appearance alone.

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Electrical Components

Browse replacement electrical components for water heaters and hot water appliances, including thermostats, thermal cut-outs, sensors, wiring looms, switches, connectors, PCB boards and electronic controllers.

Match electrical parts using the original component reference and complete appliance details. Components may differ between manufacturing generations even when the appliance model looks unchanged.

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Expansion Vessels

Browse replacement expansion vessels for water heaters, unvented cylinders and hot water systems. Expansion vessels accommodate the increase in water volume as it heats, helping to maintain stable pressure and protect system components.

Check the required vessel capacity, pre-charge pressure, maximum operating pressure, connection size and appliance compatibility before ordering. Persistent discharge from a relief valve may indicate another system fault requiring investigation.

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Gaskets & Seals

Browse replacement gaskets and seals for water heaters, hot water cylinders, immersion heaters, element plates, valves and associated components.

Match the original part number, dimensions, shape, hole pattern and appliance compatibility before ordering. Seals can become compressed or damaged when an assembly is dismantled, so fitting the correct new gasket helps create a reliable watertight joint.

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Parts by Type FAQs

How do I find the correct water heater spare part?

Start with the original component part number and complete appliance model. Also check the capacity, electrical rating, serial number, valve settings, dimensions and connections where applicable. Do not rely solely on the appearance of the component.

What information should I send if I need help identifying a part?

Send the complete appliance model, product code, serial number, capacity and electrical rating, together with clear photographs of the data label, complete appliance and existing component. Include any reference numbers printed on the part.

Are similar-looking water heater parts interchangeable?

No. Similar-looking elements, thermostats, valves, sensors and seals can have different ratings, safety settings, dimensions or applications. Compatibility should be confirmed using the original part number and appliance documentation.

What is the difference between an immersion heater and an element plate assembly?

An immersion heater is the heating component that transfers heat into the stored water. An element plate assembly is a more complete unit that may incorporate the element, mounting plate, thermostat connection and associated fittings for a particular appliance.

Why is my water heater relief valve discharging?

Discharge can be caused by excessive system pressure, a failed expansion vessel, incorrect pre-charge pressure, a faulty valve or another installation problem. Persistent discharge should be investigated rather than addressed by replacing the valve without first identifying the cause.

Do water heater replacement parts require professional installation?

Many components involve mains electricity, pressurised hot water or safety-critical controls. Diagnosis, installation and recommissioning should be completed by a suitably competent professional in accordance with the appliance manufacturer’s instructions.