153 Google Reviews
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.
No obligation. Fixed quote before any work starts.






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.
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.
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.
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, gurgling or kettling sounds usually mean sludge in the system, trapped air or a burner that needs adjusting.
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.
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.
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.
EXCELLENT
Based on 190 reviews
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michael daltonTrustindex 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 mickPosted on Google![]()
Shane O NeillTrustindex 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![]()
Rachel PhillipsTrustindex 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![]()
Patrick WheatleyTrustindex verifies that the original source of the review is Google.
Prompt,business like boiler service service,practical advice.Posted on Google![]()
Chris MothersillTrustindex verifies that the original source of the review is Google.
Friendly service fast and efficientPosted on Google![]()
Poliah PramilaTrustindex 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.... PramilaPosted on Google![]()
Georgina EastaughTrustindex 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![]()
Sandra CarrTrustindex 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![]()
Marian MillerTrustindex 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![]()
Mark CagneyTrustindex 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 TrustindexTrustindex 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
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.