Vaillant UK Reviews 

Called with system failure at 1.35pm
Engineer arrived at 3.30pm, replaced parts that had failed and had hot water again 40 mins later.
Engineer 304 was very professional and polite, and cleaned up any mess made.

Excellent engineer. Phoned in advance of arrival. Very friendly and polite, very experienced, and identified the fault immediately and replaced the faulty part. Checked system and proactively identified potential future issue and resolved that too. Tested system. All through the visit the engineer explained what he was doing. Highly recommend this company and this engineer.

Annual boiler service. Easy to book. Engineer Danny 519 phoned ahead and was early which was good. Courteous and friendly engineer

Mick called on way
I was delighted
Civee area services boiler very good

Really excellent service from vaillant. Our 15+ year boiler developed a problem. A different company advised that it needed to be replaced and quoted £4,871 to replace! The vaillant engineer quickly diagnosed a faultly PCB board and replaced in within minutes. He was thorough, professional and super knowlegeable. I could not have had better service. Highly recommend using them above any other company.

Very polite and pleasant engineer 524.
Gave lots of helpful advice regarding our heating system and how to get maximum benefit from it. All very useful as a first time user of gas heating system. Highly recommend

Unlike the other reviews here, which are all positive and in line with what you'd expect from a reputable company like Vaillant, this review unfortunately is far from a positive experience. We will think twice about Vaillant going forward.

As soon as Gary, the engineer arrived he asked us to put our dog away because it is company policy!
Even when my husband put the dog away upstairs he exerted his authority to ask if the door was locked!!!!!
To be clear we do not have a dangerous dog but a socialised friendly Hungarian Viszla.

He then asked what the issue was and then said he can't access the boiler as he needs a ladder. We offered him the step ladder which ALL other engineers in the past have used for annual checks to which he said as per company policy he had to use their own ladder but he did not have one!!!!!!!!!!!

Gary pointed out that he wouldn't have been able to open the builder door/front casing because there were shelves next to it (something which ALL and EVERY engineer to date has done and is able to do and NEVER said anything about the shelves being a hindrance)

So it would seem Gary showed up and used every excuse to NOT do the job he had been assigned and used company policy to justify it. He was in and out in less than 10 minutes!!!!

When my husband asked his name at the end Gary questioned why! I'm surprised frankly he didn't use the "company policy" card to not give us his name.

It is disappointing to see Vaillant being represented by likes of Gary who are happy to quote company policy to serve his purpose to be incompetent and unprofessional.

I bought a brand-new, factory-sealed myVAILLANT connect gateway.
The device has never been powered on.
When trying to add it in the myVAILLANT app I immediately get:
“Home is already connected”
“This home is already connected to another account”
So the serial number of a brand-new sealed unit is already bound to someone else’s account.
(Serial number starts with 21… – I can provide the full number privately to support.)
I contacted support three times. So far only evasive answers or no real help.
The advertised smart home functionality does not work.
Without a working connection the entire heating system (boiler + cylinder) does not deliver what was sold.
I will return the complete system (boiler + hot water cylinder) due to non-conformity with the advertised features and will pursue this through official consumer channels / court if necessary.
Vaillant sells new devices with already occupied serial numbers and then leaves customers without a working solution.
Unacceptable.
Update:
I have a Vaillant hub connected to two applications and two databases. There has been a complete lack of support…I would like to clarify the details of my experience.
I have two separate accounts, each linked to a different Vaillant application.
The older app fails to complete the connection process with the device — it remains stuck indefinitely.
The newer app reports that the device is already in use in another home.
Over a period of two weeks I contacted Vaillant support four times. Two of my messages received only automated replies, while the more detailed and polite ones received no response at all.
As a result, a significant amount of time has been wasted trying to resolve a basic connectivity issue that appears to have been caused by a poorly managed software update. The lack of meaningful customer support has made the situation considerably more frustrating.

Good Afternoon all reading this.
I would like to share my outstanding experience with Valliant aftercare. I've purchased my boiler in 2023 didn't have any problems...until now. Today in the morning I've lost water pressure. After topping it up it stayed for 30 min and then dropped below accepted parameters and shutting boiler down. After identifying the problem I've contacted Valliant by phone. The most professional; politest lady informed me that engineer will be with me in next 2h.
Honestly I was extremely positively surprised . An hour and bits I've received phone call from engineer , That he's on his way (that left me gobsmacked ) . Another professional. Problem pinpointed,repaired, system checked everything sorted.
I've never had better experience with aftercare. Thank you Lewis (710) and the Lady that answered my initial phone call. And thank you Valliant for being on the top of your game.
Just outstanding. I'll wish all the companies and employees had the same approach to it's customers.
Once again thank you.
Kindest regards Radek Coventry

I phoned about the boiler this morning and it was fixed by 2.30pm.
Engineer phoned to say he was 30 minutes away. He came on time, was courteous and positive and got the hot water working again. He told me he was able to pick up the spare part that was needed for the repair on the way so he was able to do the job in one visit.

10/10 excellent

Great boiler

#567

Fantastic service from Mark. Polite and couldn’t do enough. Would highly recommend

Appointment made quickly for the next day.
Andy rang ahead to give an arrival time which was helpful.
Problem diagnosed and explained well.
Fixed and given advice for future.
Andy was very polite, friendly and most of all, helpful.

Very friendly and patient service (from engineer #567) , lots of information and effort put in with attention to things that could save us trouble in future.

Had a problem with our boiler. The engineer, #252 was fantastic… charming, helpful and incredibly professional.
Thank you

had my vaillant boiler repaired yesterday by Ben151.
he explained the fault he found and the steps he was taking clearly to me and acted in a very professional manner.

Our combi boiler (Vaillant ecotec pro 35) suffered a number of under warranty CO sensor failures which required multiple visits from Vaillant engineers to sort out the problem. The need for repeated visits became an irritation so I upscaled by concerns with Vaillant and requested a permanent solution to the problem. Within a week of my complaint a visit from a senior engineer was arranged with a view to the replacing the boiler. This was agreed and one week later the engineers fitted the new boiler free of charge.
Though I was frustrated with the CO sensor failures I am impressed with both Vaillant customer services and engineers who treated our case promptly and efficiently. Within two weeks of my original email I now have a new Vaillant boiler. If only all companies acted so empathetically and promptly!

Gary is the Vaillant engineer who covers our area. He's a nice guy and knows his stuff so does any repairs or servicing needed efficiently and effectively.

Everything repaired in next to no time. Very satisfied with the service Valiant provided.