Why does an oil service cost more than a gas one?

Oil boilers need nozzle replacement, filter cleaning and combustion analysis every year, which takes more time than a typical gas service.

How often should an oil boiler be serviced?

Annually, in line with most manufacturer warranty requirements and OFTEC good practice guidance.

Does the service check the tank as well as the boiler?

Yes, tank condition and the supply line are checked for leaks or deterioration as part of a thorough oil service visit.

What happens if servicing is skipped for a few years?

Soot build-up and reduced combustion efficiency are common, and the eventual catch-up service often takes longer and costs more.

Oil servicing costs

Oil boiler service cost and what an OFTEC service covers

An oil boiler service costs a little more than a gas equivalent, and the reason is straightforward once you know what's involved: oil systems have a nozzle, filter and fire valve that need attention every year in a way gas boilers don't. Skipping it tends to show up as reduced efficiency and sootier combustion over time.

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Written for: Homeowners with an oil-fired heating system

OFTEC registered engineer servicing an oil boiler in a rural home

An oil boiler service: the short technical version

In 2026, an annual oil boiler service typically costs £90 to £130, reflecting the extra time needed to replace the fuel nozzle, clean or replace the oil filter, check the fire valve and photocell, test smoke and CO2 readings with combustion analysis equipment, and clean the appliance's fireside surfaces of soot deposits. Tank condition, supply line integrity and any signs of oil leakage around fittings are also checked as part of a thorough visit. Because oil systems can accumulate soot and residue between services more than a gas boiler, a service that's overdue by more than a year or two often takes noticeably longer and can reveal issues that a gas equivalent wouldn't show at the same interval.

Who should undertake the work

Gas appliance work must be completed by a suitably qualified Gas Safe engineer
Oil appliance work should be completed by a suitably qualified OFTEC technician
Jamie Crawford Heating states both Gas Safe and OFTEC registration

Practical notes on an oil boiler service

Annual OFTEC service typically costs £90 to £130 in 2026
Fuel nozzle replacement and filter cleaning are standard parts of the service
Combustion analysis (smoke and CO2 readings) confirms correct burner operation
Tank and supply line condition are checked alongside the boiler itself
Overdue services on oil systems often take longer due to accumulated soot

Questions we get asked

Why does an oil service cost more than a gas one?: Oil boilers need nozzle replacement, filter cleaning and combustion analysis every year, which takes more time than a typical gas service.
How often should an oil boiler be serviced?: Annually, in line with most manufacturer warranty requirements and OFTEC good practice guidance.
Does the service check the tank as well as the boiler?: Yes, tank condition and the supply line are checked for leaks or deterioration as part of a thorough oil service visit.
What happens if servicing is skipped for a few years?: Soot build-up and reduced combustion efficiency are common, and the eventual catch-up service often takes longer and costs more.

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Need help with an oil boiler service?

In practice: At £90 to £130 a year, an oil boiler service costs a little more than gas but keeps combustion efficient and protects the manufacturer warranty on the appliance.

Use the enquiry form to describe the appliance, fault code and what changed before the problem started.