DGN GAS has a 5.0 rating from 200+ Google reviews, left by homeowners, families and landlords across London over almost a decade of installs, servicing and repairs. We are also on Trustpilot, which we joined more recently. Every review on this page is copied word for word from Google, and the links below take you to the full lists.
Where to read
every review
The full, unedited lists are on the review sites themselves, with the dates and any replies.
What customers
mention most
In November 2026 we read through the 234 Google reviews that had written comments, in November 2026, and counted the words people use without being asked.
105 of them recommend us, and 54 of those say "highly recommend". 80 use the word professional, and 66 mention Ravinder by name, because he is the person you deal with from the first call.
36 say they have come back to us, or will again, often for a yearly service after an installation. 22 say we explained the problem or the work clearly, and around 28 mention that we left the place clean and tidy.
"Ravinder Singh provided the best customer service we've ever experienced. Professional, punctual, and genuinely caring — he went above and beyond to ensure everything was perfect on a new boiler install. Truly outstanding work!"
"I have had a heating system including a Vaillant boiler, Megaflo and underfloor heating installed by DGN GAS. A very professional service and am extremely happy. I especially like the after sales care. Would highly recommend."
"Ravinder Singh has been servicing my boilers for the last few years, and I honestly couldn't recommend him more. What stands out most is his ability to diagnose and fix issues that previous engineers couldn't get to the bottom of. Since then, he's been the only person I call."
"Absolutely wonderful service. 100% reliable, transparent and competitive. A company you can trust and feel in safe hands with."
"I had a new hot water cylinder fitted. DGN GAS arrived the next day, carried out diagnostics and resolved the problem. Everything came to a very fair price. I would highly recommend DGN for all my plumbing needs."
"Lovely contractor. Reliable, helpful and accommodating. Gas safe and servicing in Harrow when I lived there and now does the same for me again out in Windsor. Always happy to help wherever it takes them. Highly recommend."
"Have used DGN GAS a few times now. They installed a boiler at my parent's house and do the annual boiler servicing. I had a boiler and underfloor heating installed at my house too. Very happy with everything."
"DGN Gas installed a new Baxi Boiler for me in February 2021, they have serviced and carried out the landlord gas safety inspections ever since. Excellent professional service. Extremely satisfied."
How we ask
for reviews
We ask every customer the same way once the job is finished, usually with a short message and a link. We never offer anything for a review, we never tell anyone what to write, and we do not leave anyone out because we think they might be less happy.
If something has gone wrong on your job, we would much rather hear about it from you directly, on 07813 474638, so we can put it right.