0 verified oil boiler engineers on NI Trades · Free to post a job
An OFTEC-registered oil boiler engineer services, repairs and installs oil-fired central heating systems and oil storage tanks. This matters in Northern Ireland more than anywhere else in the UK or Ireland because around 68% of NI households heat their homes with oil (NIHE House Condition Survey 2016). Most NI homeowners need their oil boiler serviced annually, a competent engineer on call for winter breakdowns, occasional tank work, and eventually a full replacement to a modern condensing boiler. Ask your engineer to confirm their current OFTEC registration and public liability insurance, and check the OFTEC technician register directly before any work begins or any money is paid.
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Common services
Annual oil boiler service & efficiency test
Boiler breakdown diagnosis & repair
Full oil boiler replacement (condensing)
Oil tank inspection, installation & relocation
Bunded tank upgrade (single-skin replacement)
Oil feed line, fire valve & filter replacement
Nozzle & electrode replacement
Combustion analysis & flue gas testing
Landlord oil boiler safety check
Power flushing & system cleansing
Conversion from open-vent to sealed system
CD/10 & CD/11 commissioning certificates
What to ask before hiring
Are you OFTEC registered? (ask for the licence number)
Can I verify your registration at oftec.org?
Are you registered for oil-firing (OFT10-105E) and tank work (OFT10-600A)?
Will you issue a CD/10 or CD/11 certificate on completion?
What boiler brands are you accredited to install (Grant, Firebird, Worcester Bosch, Warmflow)?
Do you offer an annual service plan?
Are you fully insured with public liability cover?
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Typical costs in Northern Ireland
Job type
Typical price
Notes
Annual oil boiler service
£85–£140
Includes efficiency & combustion test
Landlord oil safety check
£95–£150
Equivalent of a gas CP12 for oil
Boiler breakdown call-out
£80–£150
Plus parts; out-of-hours rates apply
Boiler repair
£150–£500
Depends on fault and parts (nozzle, pump, control box)
Oil boiler replacement (condensing)
£2,500–£4,500
Supply & fit, like-for-like, exc. tank
Boiler + bunded tank replacement
£4,000–£6,500
Full system upgrade
New bunded oil tank (1,200L)
£1,200–£2,000
Supply, base & fit; siting rules apply
Power flush
£400–£700
Recommended before fitting a new boiler
Prices are indicative and vary based on job complexity, materials and location within NI. Always get 2-3 quotes.
Qualifications & accreditations to look for
OFTEC Registered Technician
Competent person scheme for oil-firing in NI — check oftec.org
OFT10-105E
Servicing & commissioning of oil-fired appliances up to 70kW
Grant G1, Firebird, Worcester Bosch, Warmflow installer schemes
Public Liability Insurance
Minimum £1m — required on NI Trades
Frequently asked questions
How often should I service my oil boiler in NI?
Once a year, without exception. Annual servicing is required to maintain the manufacturer warranty on almost every modern oil boiler, and an oil boiler that goes unserviced for more than 12 months will burn fuel less efficiently and is far more likely to fail in cold weather. Book your service in late summer or early autumn before the winter rush, when engineers are easier to get hold of.
What is OFTEC and why does it matter?
OFTEC (the Oil Firing Technical Association) runs the competent-person register for oil-fired heating and cooking appliances and oil storage tanks across the UK and Ireland. In Northern Ireland an OFTEC-registered technician can self-certify oil-firing work and notify it to Building Control on your behalf, in the same way Gas Safe registration works for gas. Anyone working on your oil boiler or oil tank should be on the OFTEC register — you can check the number on the card at oftec.org.
How much does an oil boiler service cost in Northern Ireland?
A standard annual service from an OFTEC-registered engineer in NI typically runs £85–£140 including a combustion efficiency test, nozzle change, filter clean and a full safety check. Landlord oil safety certificates cost slightly more (£95–£150). Many engineers offer annual service plans at £10–£18 per month which bundle the service, priority call-out and discounted parts.
How much does it cost to replace an oil boiler in NI?
A like-for-like swap to a modern A-rated condensing oil boiler typically costs £2,500–£4,500 supplied and fitted, depending on brand (Grant, Firebird, Worcester Bosch and Warmflow are the most common in NI). Replacing the boiler and the oil tank at the same time runs £4,000–£6,500. Moving the boiler, upgrading to a sealed system or adding a power flush will add to the figure — always get an itemised written quote.
Is my oil boiler engineer registered? How do I check?
Ask to see their OFTEC ID card — every registered technician carries one with a photo, a licence number and the categories of work they are signed off for (look for OFT10-105E for boiler servicing and OFT10-600A for tank work). You can verify the number against the live register at oftec.org/find-a-technician. If an engineer cannot produce a card or refuses to be checked, do not let them touch the appliance.
Can any plumber work on my oil boiler?
No. Oil-firing is regulated work — a general plumber without OFTEC registration cannot lawfully commission a new oil boiler or oil tank in NI, and cannot self-certify the installation to Building Control. Some plumbers hold both Gas Safe and OFTEC tickets, which is fine; the test is whether the specific person carrying out the oil-firing work is OFTEC-registered for the category of work they are doing.
Do I need building control approval for a new oil boiler?
Yes. A new or replacement oil boiler is notifiable work under Northern Ireland building regulations. The simplest route is to use an OFTEC-registered installer who can self-certify and notify the work for you, then issue a CD/11 commissioning certificate. If the work is done by someone who is not OFTEC-registered you must apply to your local council Building Control directly, pay a fee and arrange an inspection — slower and more expensive. Keep the CD/11 (or Building Control completion certificate) with your home paperwork; conveyancing solicitors routinely ask for it on sale.
Important
Only an OFTEC-registered technician can self-certify oil-firing work in Northern Ireland and notify the installation to Building Control on your behalf. Always ask to see their OFTEC ID card before work starts and check the number at oftec.org. A registered engineer also issues a CD/11 commissioning certificate on a new install — keep this with your home paperwork; you will need it when selling.
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Practical guides
Before you hire a oil boiler engineer
Five-minute reads from the NI Trades editorial team on vetting, costs and consumer rights specific to Northern Ireland.