Why oil boiler nozzles and electrodes are replaced every year
An oil burner atomises fuel through a precision nozzle and ignites it with a spark across a fixed electrode gap. Both wear steadily with normal use.
What matters most with oil nozzle and electrode replacement
- Nozzle wear changes spray pattern and combustion quality
- Electrode gap drifts with use and affects ignition reliability
- Both are treated as scheduled wear items, not fault-driven repairs
- Replacement supports accurate smoke and combustion test results
- Correct nozzle sizing must match the appliance's rated output
Oil nozzle and electrode replacement: the short technical version
A worn nozzle changes the spray pattern and droplet size, which affects how completely the fuel burns and how much soot accumulates on the heat exchanger. Electrodes erode at the spark tip and their gap drifts out of specification, weakening ignition reliability. Replacing both as routine wear items at each service keeps combustion settings consistent rather than waiting for a fault to appear.
Scope of work
- Domestic boiler installation
- Boiler servicing
- Boiler maintenance and repair
Where we deal with this
Questions we get asked
- Can a nozzle be cleaned instead of replaced?
- Cleaning does not restore the original spray geometry reliably, which is why replacement is the standard approach at service time.
- What happens if electrodes are left worn?
- Ignition becomes less reliable over time, which can lead to intermittent start-up failures or lockouts on cold mornings.
Talk to us about oil nozzle and electrode replacement
Where this leaves you: Treating the nozzle and electrodes as routine replacement parts, rather than waiting for symptoms, keeps an oil burner starting reliably through winter.
Include the appliance make and model in your enquiry so the correct technical information can be checked.
Related help pages
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- Emergency preparednessEmergency isolation: knowing where and how to shut off supply
- Condensate maintenanceCondensate trap cleaning: a small job that prevents a lockout
- Heat exchanger careHeat exchanger cleaning: when a deep clean is the right call
- New tenancy preparationHeating checks worth doing at the start of a new tenancy
- Servicing comparisonAnnual service plan vs pay-as-you-go servicing
Services that cover this
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