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Navien UK Reviews

Rated 3.2 based on 25 Reviews

First Floor, Building 2 Guildford Business Park Rd, Guildford GU2 8XG

Uncategorized Guildford

Published on
August 6, 2025
Last updated
August 6, 2025

Reviews Summary

Overall sentiment toward Navien's boiler products and services is mixed, with significant contrasts in customer experiences. Reviewers consistently highlight either prompt, knowledgeable support resolving boiler issues or frustration with long delays, poor communication, and difficulty accessing technical help. While some engineers emphasize reliable performance and responsive assistance, others express strong dissatisfaction with customer service and warranty processes.

A major recurring theme involves the variability in technical support—the helpline and certain staff members receive praise for their expertise and willingness to help, yet other accounts describe inaccurate advice, engineers not showing up, and unresolved technical issues. Customers also repeatedly mention problems with registering warranties through the app, concerns about the availability of parts or engineers, and long periods without heating or hot water. Positive feedback centers mainly on knowledgeable responses, rapid repairs, and notable fuel savings from installed boilers.

Overall, Navien is regarded as a competitive boiler manufacturer in the UK, but with a reputation for inconsistent post-sales support and several issues around warranty responsiveness. The combination of technical strengths and recurring service complaints makes it important for prospective customers in regions like Buckinghamshire to weigh reliability and aftercare alongside product benefits.
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What Customers Are Saying About Navien UK?

quick response and any issues resolved quickly

very good service and the helpline team are extremely knowledgable and friendly

excellent engineer (Nigel Stokes) to look at the issue

excellent level service from him

boiler itself has been fine in the 2 years I've had it

got someone round quickly after the installers passed the issues on

didn't leave until things were in working order

Trustguide extracts key phrases from reviews about Navien UK and sort them by sentiment. This gives you a quick view of what customers consistently praise or raise concerns about—without needing to read every review.

Satisfaction Score

Based on the set of reviews used to generate this report, it appears that 30% of Navien UK's customers had a positive experience.

Positive
30%
Neutral
10%
Negative
60%

Navien UK Ratings

1

As of Based on 25 revies as of Aug 06, 2025

Navien UK Score

30%

As of Based on 25 revies as of Aug 06, 2025

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Customer Reviews

As of Aug 06, 2025, 25 customers have reviewed this business and rated it 3.2 Star out of 5. Trustguide conducted an in-depth analysis of Navien UK's publicly available reviews View source

Ryan Jones rated Navien UK 5 stars
a month ago
I Love this company / products especially there oil boiler range which I have most experience with. I am an oil & gas engineer / installer and fitted over 10 Navien oil boilers & 15 Navien boilers in total over last 4 years. I have had many dealings with either warranty / technical and customer service and generaly had quick response and any issues resolved quickly. All my customers are really happy with Navien boiler & controls fitted, and have proven to show big savings in fuel consumption. I will be using Navien as my preferred manufacture or choice for all heating products going forward in future. Ryan
David rated Navien UK 1 stars
3 months ago
Navien were unable to provide an engineer under warranty and the treatment we received was, in my opinion, bordering on contempt. They fed us absolute rubbish for 4 days (actually five but the first day was a Monday bank holiday) whilst we had no hot water from their 6 months old boiler sourced from Boxt. They initially arranged for an engineer on the Wednesday morning and he didn’t show up. We contacted Navien to be told they couldn’t contact him as he wasn’t answering the phone - and this went on for the rest of the week. Complaint went nowhere (I suspect they may not have the processes in place to deal with complaints). We sourced the boiler through Boxt (they were excellent in the quick supply and installation) and they took up the issue on our behalf. After a couple of phone conversations they were told that a Navien engineer was “in the area”. This was just before 5pm on the Thursday and he would phone to let us know if he could attend that evening. It was the first we’d heard of it and didn’t believe it, which is what I told Boxt. I told Boxt that we are not cancelling a social get together on the vague premise that an engineer may be available. Boxt (Clare, very professional) said the engineer will phone us. Obviously Boxt were fed the same guff as us - not their fault. Needless to say we received no phone call from the elusive (fictitious) engineer. Which is exactly what we expected. Boxt sent me a £50 shopping voucher for for the inconvenience. On Friday morning at 09.00 we arranged for our own engineer. I will be sending the bill to both Boxt and Navien. That will probably be another "experience". It is also important to point out that at no time did anyone from Navien ask how many people live in the house or if anyone in the house was disabled, infirm, young child etc. which would inform the level of their response. I find that concerning. It was the very first thing I was asked by Boxt on our first phone conversation. I have contacted the relevant authorities in this regard. In closing (sorry it was such a long rant), I would advise anyone to carefully look at the one star reviews on Trust Pilot and Google for Navien and balance that carefully with the other reviews before deciding on which boiler to buy. (awaits the standard "referred to customer services manager" reply - not interested, case closed) **update - received a call from Navien directly after reviews were published and after emailing Boxt. They said an engineer will be there tomorrow ! Too little , too late after all the guff they gave us and the poor service. Told them not to contact me again.** **** Further update. The independent heating engineer we have used over years to service our old boiler has refused to work on the Navien boiler stating that it is "more trouble than its worth". We have now gone to Bristish Gas to resolve the problem(s).
David Cairns rated Navien UK 1 stars
3 months ago
Forced to download their app to register warranties? Why can't we do it from the website like every other boiler manufacturer in the UK? Tried to call customer services about 8 times now, nobody answers, just plays music. Offers a call back service - nobody calls you back. You get what you pay for - cheap boiler = cheap service. I've installed about 15 of these boilers now and there won't be a 16th. I'm so worried about my customers and the ticking time bombs I've installed in their homes. I blame myself.

Frequently Asked Questions About Navien UK

Is Navien's warranty service responsive and reliable?

Reviewers report mixed experiences with Navien's warranty service. Some praise the quick response and issue resolution, while others express frustration with slow response times, difficulty contacting support, and delays in securing an engineer visit.

How accessible is Navien's technical support for troubleshooting?

Technical support quality is inconsistent based on reviews. While some customers receive knowledgeable advice and effective assistance, others mention issues such as incorrect technical information, calls not being answered, and unhelpful responses when seeking detailed help.

How can customers register their Navien boiler warranties?

Navien primarily requires customers to register warranties via their mobile app. Several reviewers mention challenges with this process and difficulty reaching customer service for support with app-related issues.

About Navien UK

Uncategorized
Navien is a manufacturer of residential and commercial boilers, providing oil and gas-based heating appliances to the UK market. The company offers a range of boiler models and associated heating controls, working with installers and service engineers to ensure product delivery and setup at customer premises.

Navien operates by coordinating product distribution, technical support, and warranty management. Customers generally interact with the company through technical helplines, warranty registration (primarily via a mobile app), and field service engineers for installations, maintenance, and repairs. Processes include pre-sales advice, post-installation troubleshooting, and aftercare services.
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How is this report generated

Trustguide generates concise, neutral summaries of business reviews. By analyzing publicly available feedback from reputable platforms, it highlights common experiences, praises, and concerns. This allows users to quickly understand a business’s reputation without reading every individual review.4o
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