Google
★★★★★

153 Google Reviews

Emergency Typical arrival 30–60 min ↗

Oil Boiler Service in Dublin, from Repair to Replacement

Is your oil boiler noisy, using more oil, or refusing to fire? Our RGI-registered Dublin engineers service, repair and replace oil-fired boilers, usually the same week, with a clear quote before any work begins and a 24-hour emergency line.

Get a Quote

No obligation. Fixed quote before any work starts.

Our Clients

Trusted By Leading Brands

What Our Oil Boiler Service Includes

Every oil boiler service we carry out follows the same thorough checklist, so nothing gets missed. Here is exactly what your RGI-registered engineer does on the day.

Full safety and combustion check

Clean the burner and nozzle

Inspect and replace the oil filter

Check oil lines and connections for leaks

Test flue and ventilation

Inspect seals, gaskets and pipework

Check and adjust burner pressure

Test controls and safety devices

Written service report on completion

Common Oil Boiler Problems We Fix

Oil boilers usually warn you before they fail. If your boiler is showing any of these signs, our Dublin engineers can repair it fast, often the same week.

Boiler Won't Fire Up

The boiler has locked out and won’t start. Common causes are a dirty nozzle, a faulty photocell, an ignition fault or no oil getting through to the burner.

Keeps Cutting Out

Your boiler fires then stops, or locks out again after a reset. Usually a clogged filter, air in the oil line, or an overheating fault.

Banging or Kettling Noises

Banging, gurgling or kettling sounds usually mean sludge in the system, trapped air or a burner that needs adjusting.

Smell of Oil or Fumes

An oil or smoky smell, or a yellow flame instead of blue, points to incomplete combustion or a leak. Turn the boiler off and call an engineer.

No Heat or Hot Water

Radiators cold or no hot water, even though the boiler seems on? The fault is often the pump, thermostat, a valve or the burner itself.

Rising Oil Bills

Using more oil for the same heat usually means the boiler is running inefficiently, often from soot build-up, a worn nozzle or a burner out of tune.

Real Customers, Real Reviews

Rated 5-Star by Dublin Homeowners

EXCELLENT
Google star 1Google star 2Google star 3Google star 4Google star 5
Based on 190 reviews
Posted on Google Google
michael dalton profile picture
michael dalton
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Great company I needed a radiator installed had two very nice young lads install it Graham and Leon both very polite and good at their job would highly recommend this company mick
Posted on Google Google
Shane O Neill profile picture
Shane O Neill
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Will definitely use again. Extremely professional. The job was arranged quickly after my first call. Very good communication from start to finish.
Posted on Google Google
Rachel Phillips profile picture
Rachel Phillips
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
I had an emergency as my heating wouldn't turn on and no hot water,I ran cortech plumbing and they were out to me in half an hour and took them only five minutes to fix the problem,would recommend them to everyone,brilliant service,they also gave me a discount as I am a former customer.
Posted on Google Google
Patrick Wheatley profile picture
Patrick Wheatley
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Prompt,business like boiler service service,practical advice.
Posted on Google Google
Chris Mothersill profile picture
Chris Mothersill
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Friendly service fast and efficient
Posted on Google Google
Poliah Pramila profile picture
Poliah Pramila
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Monday 14th September 2026. I am extremely happy with the service I received from Cortech Plumbing & Heating. My boiler was leaking and there was a strong smell of gas,which was very concerning and worrying as well. They responded quickly...very professional and reassuring...they identified and dealt with the problem efficiently. Honestly I really appreciated their prompt response... knowledgeable and excellent customer service.. They were reliable and friendly...They also make sure that everything was sorted accordingly in a proper way. I would highly recommend Cortech Plumbing & Heating to anyone looking for a trustworthy and professional staff worker... I extremely appreciated their excellent service from start to finish..... Thank you all the great excellent staff worker.... Pramila
Posted on Google Google
Georgina Eastaugh profile picture
Georgina Eastaugh
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Massive thank you to Ben from Cortech who came for an emergency call out to find my wedding ring. Didn’t need any plumbing work thankfully as he found it in about 10 seconds by figuring out what had happened - a very logical approach. Left me feeling silly, but very grateful. Thanks so much!
Posted on Google Google
Sandra Carr profile picture
Sandra Carr
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Thank you so much for your fantastic work!! Ben is exceptional. Always comes out very fast after calling him. I’ve had him out a couple of times now and they are a great company to work with!
Posted on Google Google
Marian Miller profile picture
Marian Miller
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Very happy with service. Very Customer friendly. Ben a very pleasant and polite young man. Very happy with service. Diagnosed an issue we were pleased to be made aware of. Definitely would recommend this Company.
Posted on Google Google
Mark Cagney profile picture
Mark Cagney
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
I had a shower unit locked open with water flowing for a couple of hours and needed a call out. Found Cortech on Google and rang them about 9.30 am on a Friday morning. The service man, a really helpful guy called Ben was here in 40 mins and sorted the problem immediately. He also helped me find a company who had a replacement unit and parts. From my initial call, to job completed ( including help with finding replacement unit ) took 45 mins. The speed and efficiency of the service, plus the really pleasant manner in which I was dealt with was a breath of fresh air. I would highly recommend Cortech Plumbing.
Verified by Trustindex
Trustindex verified badge is the Universal Symbol of Trust. Only the greatest companies can get the verified badge who has a review score above 4.5, based on customer reviews over the past 12 months. Read more

Repair or Replace Your Oil Boiler?

Not every oil boiler needs replacing. If the motor and body are sound and the fault is a worn part, a repair is usually the cheaper fix. Most oil boilers last around 15 years, so once yours is past that, or breaking down often, replacement starts to make more sense.

Our RGI-registered engineers assess your boiler, explain what’s wrong in plain terms, and quote for a repair or a replacement so you can decide. If a new boiler is the answer, we supply and fit high-efficiency oil-fired models.

Oil Boiler Service and Repair Costs in Ireland

Oil boiler costs depend on the job, the boiler and the access, so here are independent Irish market estimates to help you plan. They are guide figures only and are not Cortech’s prices. Your exact cost is confirmed in a clear quote first.