Boiler Electrodes, Probes & Leads

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Restore reliable boiler ignition and temperature control with our extensive range of replacement electrodes, probes, and leads. We stock exact-match boiler spares from industry-leading manufacturers to help heating engineers complete safe and compliant breakdown repairs on the first visit.

183461

Worcester Bosch Greenstar I Junior SI RI Electrode 87161163810

£32.40

each, Inc. VAT

434955

Worcester Bosch Greenstar CDI Electrodes Set 8716121817

£48.24

each, Inc. VAT

183282

Ideal Max System Boilers Ignition Electrode 175591

£30.00

each, Inc. VAT

618562

Baxi Ignition Electrode 720222801

£34.80

each, Inc. VAT

183281

Ideal Detection Electrode White 175592

£21.11

each, Inc. VAT

534820

Baxi Electrode Assembly Kit 5132097

£49.20

each, Inc. VAT

905208

Vaillant Electrode Boiler Pro 28 0020133816

£26.40

each, Inc. VAT

618561

Baxi Ionisation Electrode Kit 720222901

£39.60

each, Inc. VAT

378410

Worcester Bosch Spark and Ionisation Electrodes Set 871860028A0

£26.53

each, Inc. VAT

491314

Vaillant ecoTEC Plus R1/Ecomax/ecoTEC+ R1 Ignition and Monitoring Electrode 0...

£23.27

each, Inc. VAT

247469

UCP Ignition Electrode 720222801

£31.32

each, Inc. VAT

435446

UCP Greenstar CDI Electrodes Set 8716121817

£43.42

each, Inc. VAT

799123

Viessmann Ignition and Ionization Electrode Block 7828718

£50.40

each, Inc. VAT

938552

Baxi 720767301 Spark Electrode Duo2 N/Tec

£43.20

each, Inc. VAT

711147

Vaillant Ignition Electrode Cable 20135119

£31.20

each, Inc. VAT

879752

UCP Electrode Assembly Kit 5132097

£44.28

each, Inc. VAT

259574

Ideal Ignition Electrode Kit 176207

£50.40

each, Inc. VAT

435076

Baxi 7686344 Ignition Electrode Part

£82.80

each, Inc. VAT

578752

Valor Ignition and Ionisation Electrode 5130293

£52.80

each, Inc. VAT

843799

Baxi Duo2 N/Tec Flame Sensing Electrode 720767101

£46.80

each, Inc. VAT

573260

Alpha Electrode Kit Immergas 3.025192

£73.20

each, Inc. VAT

499275

Ideal Boilers Ignition Istor Electrode Kit 173528

£24.56

each, Inc. VAT

499277

Ideal Flame Sensing Electrode Kit 173529

£27.60

each, Inc. VAT

433965

Vaillant Ecofit Pure VUW / Home Combi Ignition and Sensing Electrode 00201954...

£20.11

each, Inc. VAT

433337

Vaillant 0020143440 Electrode Maintenance Kt

£114.00

each, Inc. VAT

107364

Alpha Ignition Electrode and Lead 3.017477

£64.80

each, Inc. VAT

281004

Vaillant Ignition Electrode and Cable 20153950

£54.00

each, Inc. VAT

556927

Glow-Worm 0020020731 Electrode (Flexicom Sx, Hx & Cx)

£24.82

each, Inc. VAT

647710

Ideal Detection Electrode Kit 176206

£32.40

each, Inc. VAT

618619

Baxi Ignition and Detection Electrode Kit 5110992

£69.60

each, Inc. VAT

Showing 1—30 items of 535

Diagnosing boiler lockouts often points directly to ignition failure or inaccurate temperature readings. Our comprehensive stock of internal boiler spares provides heating engineers with the exact components required to rectify these faults efficiently. The range includes durable spark ignition electrodes and flame sensing probes designed to endure intense combustion chamber temperatures, ensuring reliable burner operation and safety compliance. We also supply highly sensitive NTC temperature probes, thermistors, and high-voltage ignition leads tailored for specific boiler models. Using manufacturer-approved parts guarantees correct electrical resistance and physical alignment within the burner assembly. With extensive local stock across our network of over 350 City Plumbing branches, you can source the exact replacement components required to clear boiler fault codes and restore domestic heating systems without unnecessary delays.

Frequently Asked Questions

How do I know if a boiler ignition electrode needs replacing?

A failing ignition electrode usually results in the boiler failing to light, often triggering an ignition lockout fault code on the display. During inspection, you might notice the ceramic insulation is cracked, the metal spark pin is heavily degraded, or the spark is tracking to the casing instead of across to the burner. If cleaning the electrode with an abrasive cloth does not restore a strong, consistent spark, the component and its associated ignition lead should be replaced.

What is the difference between an ignition electrode and a flame sensing probe?

The ignition electrode generates the high-voltage electrical spark required to ignite the gas and air mixture within the combustion chamber. In contrast, the flame sensing probe (often called an ionisation electrode) detects whether a flame is actually present by measuring a small electrical current passing through the fire. If the sensing probe fails to detect a flame immediately after ignition, the boiler printed circuit board will shut off the gas valve to prevent a dangerous build-up of unburnt fuel.

Can I use universal temperature probes in a modern boiler?

You should never use universal temperature probes or thermistors in a central heating boiler. Each manufacturer calibrates their printed circuit board to read specific resistance values at precise temperatures. Fitting an incompatible NTC probe will feed incorrect data to the control board, leading to severe overheating, poor efficiency, or immediate system lockouts. Always source the exact replacement probe using the manufacturer part number or the specific boiler GC number.

Electrodes, Probes & Leads

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Type

Brand

Colour

Price

Worcester Bosch Greenstar I Junior SI RI Electrode 87161163810

£32.40

Worcester Bosch Greenstar CDI Electrodes Set 8716121817

£48.24

Ideal Max System Boilers Ignition Electrode 175591

£30.00

Baxi Ignition Electrode 720222801

£34.80

Ideal Detection Electrode White 175592

£21.11

Baxi Electrode Assembly Kit 5132097

£49.20

Vaillant Electrode Boiler Pro 28 0020133816

£26.40

Baxi Ionisation Electrode Kit 720222901

£39.60

Worcester Bosch Spark and Ionisation Electrodes Set 871860028A0

£26.53

Vaillant ecoTEC Plus R1/Ecomax/ecoTEC+ R1 Ignition and Monitoring Electrode 0...

£23.27

UCP Ignition Electrode 720222801

£31.32

UCP Greenstar CDI Electrodes Set 8716121817

£43.42

Viessmann Ignition and Ionization Electrode Block 7828718

£50.40

Baxi 720767301 Spark Electrode Duo2 N/Tec

£43.20

Vaillant Ignition Electrode Cable 20135119

£31.20

UCP Electrode Assembly Kit 5132097

£44.28

Ideal Ignition Electrode Kit 176207

£50.40

Baxi 7686344 Ignition Electrode Part

£82.80

Valor Ignition and Ionisation Electrode 5130293

£52.80

Baxi Duo2 N/Tec Flame Sensing Electrode 720767101

£46.80

Alpha Electrode Kit Immergas 3.025192

£73.20

Ideal Boilers Ignition Istor Electrode Kit 173528

£24.56

Ideal Flame Sensing Electrode Kit 173529

£27.60

Vaillant Ecofit Pure VUW / Home Combi Ignition and Sensing Electrode 00201954...

£20.11

Vaillant 0020143440 Electrode Maintenance Kt

£114.00

Alpha Ignition Electrode and Lead 3.017477

£64.80

Vaillant Ignition Electrode and Cable 20153950

£54.00

Glow-Worm 0020020731 Electrode (Flexicom Sx, Hx & Cx)

£24.82

Ideal Detection Electrode Kit 176206

£32.40

Baxi Ignition and Detection Electrode Kit 5110992

£69.60

Frequently Asked Questions

How do I know if a boiler ignition electrode needs replacing?

What is the difference between an ignition electrode and a flame sensing probe?

Can I use universal temperature probes in a modern boiler?

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