Vaillant UK Reviews 23,057

Excellent quick and effective service

John was super professional and competent. Fixed problem as well as hidden ancillary issues all in single sweep. Great experience delivered efficiently by a most competent boiler service professional. Thank you John.

Engineer fixed the leak and a couple of other parts on my boiler efficiently and quietly. Serviced it and got it running again. All done without any fuss. Thank you.

Engineer 820
Vaillant engineer called out regarding a problem with noise - he arrived on time and was polite and respectful. He was very helpful and knowledgeable, he explained what he was checking and gave a good explanation of what the issue was before leaving.

Adam (102) was very polite friendly and knowledgeable. He showed me how to use the Ecco function on the boiler
I was impressed with the service

I dont know if it is vaillant or the installer that is the problem.
We moved into a new bungalow on 11th Nov 2025. It is fitted with a vaillant heat pump and cylinder with underfloor heating. Since moving in we have has at least 5 issues which required the installer to fix. Mostly leaks either from the heat pump or expansion tanks in the house.
We are on holiday atm and I have now received two error messages on my vaillant app. They say the internal system cannot communicate with the outside unit.
I dont think there is any danger of further damage. The system has just shut down. We will not be able to get it fixed until 19th May when we return.
I have lost faith in this system. When we go away in future we will have to leave a key so that when it breaks down again we can get it fixed. Its not bad now but if this happened when we are away in the winter it could be a major problem.

I was originally told that the reason why my boiler was not working was due to a fault with the condensation pipe ( outside of the boiler warranty). I then sought third party services to fix the issue with the condensation pipe ( at significant cost) The boiler continued to have problems and I was told by an independent engineer that the issue was definitely with the boiler. When I asked Vaillant to come back they confirmed that there were issues with several parts of the boiler. When the engineer came back the following week to fix the boiler they mentioned that the state the boiler was in could have been a danger. The boiler has worked fine since the boiler has been fixed. I have requested a reimbursement of an invoice for the work on the condensation pipe that was done unnecessarily and Vaillant have refused to pay this.

Great quality, long lasting boiler, super service from engineers when services or repairs/replacements are needed, the latter being rare and after 16 years not unexpected.

mick arrived friday found fault but need a prt being saterday we had a big wedding caters ect so hearing this he said he’d pop in on his day off because he didn’t want a special day to be spoilt
he returned saturday and was sorted all good to go for the special day
amazing service

Booking the appointment was easy and the engineer arrived and efficiently fixed my boiler with minimal disruption. He was self sufficient and professional. Many thanks Stuart much appreciated.

We had a fantastic technician called Michael that came to us today. So professional and knowledgeable. A really great guy! Michael restored my faith in Vaillant as the last technician was rude and missed lots of faults. Thank you Michael - we will specifically ask for you next time!

Neil 201 and Panaus 244 were absolutely excellent. They replicated the issue and fixed the problem very quickly. They were a pleasure to have in our home and a credit to Vaillant.

Vaillant scheduled our call the same day. This is service at its best.

Thank you.

#252
Devon was fantastic today, investigated the issue, re-pressurized our system & had us back working again perfectly.
Very polite & was extremely helpful explaining what was needed. Great job.

Lee and Bret did a superb job of fitting our new Vaillant ecoFIT pure 830 boiler today and also a new bathroom towel rail. Our Vaillant /Glow Worm engineers kept us fully informed as the work progressed and were absolutely excellent throughout. Our new boiler is working perfectly and runs so quietly and efficiently compared to the old one (made by a different company). We look forward to very many years of service from our new boiler which will be serviced and cared for in the future by Lee and Bret.

I phoned got the help that I needed to solve the problem, it was as simple as that.
The guy I spoke through was very helpful and I was very greatful for his help.

Well under 2 weeks from my last post and my new boiler is fitted in under 4 hours. Simon #314 called 24 hrs before to check all was ok and good to go and if the new boiler had arrived, he also checked if it was ok to have an early start. Simon #314 and Gareth #319 arrived on time and work diligently, and efficiently to install the boiler and when complete cleaned up and removed all the packaging and old boiler. I cannot praise them enough. Customer services have also bern very proactive throughout. These are the reasons and the quality of the product why I have stayed with Vaillant.

Devon was really great. So helpful, knowledgeable, efficient and friendly. I highly appreciated his swift support in fixing the boiler that had stopped working following a power cut. Huge 5 stars to him!

Spot on repair by a very nice guy good job very tidy

Fred, Engineer 820 attended and finally managed to fix my air source heat pump after it not working properly for the last 15 months. He was very friendly, polite and professional.