Heating Services Certas Energy Reviews 

Annual boiler service carried out by Mark Airey. Arrived on time. Very happy with excellent job completed.

Their engineer is very experienced friendly courteous i have had the boiler serviced by Mark for the last 10 years and always have the greatest confidence in him

Mark Armstrong has been looking after my boiler for the best part of the last decade, I always request him and he never lets me down! Totally professional he is a credit to Certas.

First time I've used Certas for boiler servicing. Good service: friendly and knowledgeable engineer Gareth arrived promptly and completed the job in good time. Refreshing to meet someone who clearly enjoys their job! Probably more expensive than a local boy, but reliable and thus definitely recommended.

The engineer Jake Winter was very polite and efficient.

Prompt, friendly, efficient, clean, everything you would want from a boiler servicing. If Mark Armstrong is an example of the Certas Boiler Team they are seriously well represented.

Reaarranged at short notice. Engineer Mark Armstrong came, as good humoured as always. Quick efficient

Raymond yet again provided a first class service. Very thorough and very easy to deal with. Thank you!

Mark Armstrong came today to service our boiler, absolutely charming gentleman and very thorough .
Explained everything very clearly about what he had done
Very welcome to come back again

I've been using Certas for my oil boiler annual service for 3 years now. It's been Gareth Thomas each time and he's really friendly and helpful but most importantly he is very experienced and knows what he is doing. I can highly recommend and the price has always been good.

Annual service carried out by Craig Vecchi in a professional and pleasant manner. As always Craig is a clean and efficient worker, always a pleasure to see him.

Great Engineer Mark Armstrong.
Worked hard, Knew his stuff and taught me how to look after my boiler properly. Had all the correct parts needed with him and was professional with high standards. The backup you need in the countryside on oil. Thanks Doug.

Problem quickly detected & replacement parts supplied & fitted by
Jake Winter .

Knowledge and ability gave me great confidence

Very happy with my engineer Mark Armstrong
He completed my service in good time and explained what was required and needed also checked my oil tank for water which he’s never been done before
All in all a great job done

I’m very happy with the Engineer Kevin Forsyth who carried out the service to my Stanley Boiler. He did a thorough job and explained clearly why a few repairs/ small parts replacements were needed. Easy going and friendly man who was confident and knowledgeable.

Clear communication, on time and helpful with information.

Craig Vecchi did a great job, as usual. Would have been 5* if the office had sent me a reminder.

Gwasanaeth proffesiynol, ond gellid gwella’r cyfathrebu

Gwasanaeth ardderchog unwaith eto gan Mark Armstrong o Certas. Daeth yn gynnar, bu’n daclus, ac fe gwblhaodd y gwasanaeth boeler yn ofalus ac yn broffesiynol. Cymerodd yr amser i egluro’r gwaith hefyd—rhywbeth gwerthfawr iawn.

Yn anffodus, roedd y cyfathrebu cyn y gwasanaeth ychydig yn siomedig. Cafodd y gwasanaeth ei archebu dros y ffôn ar 19 Mehefin 2025,ond ni chafwyd e-bost cadarnhau fel y dywedwyd y byddai. Hefyd, ni chafwyd y galwad ffôn arferol y diwrnod cyn y gwasanaeth nac ychwaith neges testun, fel sydd wedi bod yn arfer ers blynyddoedd.

Manylion bach, ond maen nhw’n cyfrif. Gobeithio y gall Certas gryfhau’r ochr weinyddol i gyd-fynd â safon y gwasanaeth ar y safle.
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Professional service, but communication could improve

Mark Armstrong from Certas delivered excellent service once again. He arrived early, worked tidily, and completed the boiler service with care and professionalism. He also took the time to explain what had been done, which was genuinely appreciated—great to gain that insight.

Unfortunately, the communication beforehand let things down slightly. The service was booked by phone back on June, but no confirmation email was received, despite being told one would be sent. We also didn’t get the usual courtesy call or text message the day before the visit, which has been standard in previous years.

Small details, but they make a difference. Hoping Certas can tighten up the admin side to match the quality of the on-site service.

Diolch / Thanks

Mark Armstrong was on time, thorough, enthusiastic about his job and personable. Explained everything in language we could understand and a tidy job on our oil boiler. No complaints whatsoever.