A local installer or British Gas?
What is the same, and what is different.

The same boilers, the same manufacturer guarantees - so what are you actually choosing between? A fair comparison, without rubbishing anyone.

Ravinder Singh, Founder of DGN GAS
Ravinder Singh - Founder, DGN GASGas Safe registered · Baxi Approved · Vaillant Advance Platinum · Worcester Bosch Installer
The Short Answer

The boiler in the box is identical whoever fits it, and through our Vaillant, Baxi, Worcester Bosch and ATAG installer status the extended manufacturer guarantee is available either way. The differences are in who you deal with, how the price is put together, and who turns up afterwards. Both are legitimate ways to buy a boiler and they suit different people.

The Same Either Way

What is exactly the same
whoever you choose

Plenty of comparisons pretend otherwise, so it is worth setting out first.

A Worcester Bosch or a Vaillant bought through a national company is the same appliance we fit, from the same factory, with the same parts inside it.

The manufacturer guarantee is the same class of cover as well. Manufacturers extend their guarantees through their own installer schemes - national companies are on them, and so are we, for Vaillant, Baxi, Worcester Bosch and ATAG. The years vary by brand and model rather than by who installs it, and on our quotes the exact guarantee is written down per boiler.

And the gas safety rules do not change with the size of the company. Every installer, national or local, must be Gas Safe registered - ours is No. 623092, and you can check it on the Gas Safe Register before anyone sets foot in your home. The building regulations notification, the flushing and the filter are required of both of us in exactly the same way.

If anyone tells you a national brand gets you a better boiler or a stronger guarantee than a local installer who is on the same schemes, that is not how the schemes work.

Where It Is Different

What is different
and it is mostly about people

With a national company, the person who surveys and the person who answers when something rattles six months later are usually in different departments. Any organisation at that scale has to run that way, and some customers prefer the big-company feel.

With us you are dealing with the same people from start to finish. You can speak directly to Ravinder - the founder whose name is in the reviews - before the job and for years after it. Most of our customers have been with us for years, and the servicing afterwards is done by the same team, across West, North West and South West London. When you read our 220+ five-star Google reviews, notice how many of them name the same person, because that continuity is something a big organisation is not set up to offer, however good it is.

On price, we will not quote you British Gas's numbers - they are theirs to publish and they vary by job. What we can tell you is how ours work: a survey first, then a written fixed price naming the exact make and model, and the number you are given is the number you pay.

We are not a faceless giant company. You deal with our small local team and can speak directly with the founder. We don't compete with British Gas or any other major or smaller firm on price. We want to provide you with a service that gives you peace of mind for the comfort and safety of your family or those under your care.

How To Choose

How to choose between us
a fair test either way

Get both quotes in writing and compare like for like: the exact model, the guarantee years as written, what is included (flush, filter, thermostat, removal), and the timing. Then ask each of us the same question, which is who you call if something is wrong in eighteen months and who turns up, because that answer will tell you more than the brochure will.

If you want the reassurance of a household name, that is a fair choice and we would not talk you out of it. If you would rather have the founder's mobile number and the same faces at every visit, that is what we offer.

Our priority is to ensure you have a positive experience with us and get the service you require. We cater your quote on your requirements and will not simply push one particular brand or model on you, we will look at the different options that suit you. On a site survey having discussed your requirements we will assess the location of the appliance, the work involved and what the best course of action is. We then provide a written no obligation quote and the client is always welcome to ask any follow up questions.

What Customers Say
★★★★★

"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."

Jasdeep Heer
Google Review · 2025
★★★★★

"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."

Suzanne Morgan
Google Review · July 2026
In Summary

The short version

The boiler, the guarantee and the rules it is installed under are the same whichever of us you choose, so the decision comes down to who you would rather be dealing with, which with a national company is usually a department and with us is the founder and the same small team servicing your boiler in West, North West and South West London year after year. Compare the written quotes model for model and year for year, and choose whichever suits you (we would rather you did that than took our word for it).

Common Questions

Quick answers

Is the manufacturer guarantee shorter with a local installer?
Not if the installer is on the manufacturer's scheme. The extended guarantees come through the manufacturers' installer schemes, and we hold that status with Vaillant, Baxi, Worcester Bosch and ATAG. The exact years depend on the brand and model, and they are written on our quotes per boiler.
Is a local installer cheaper than British Gas?
We are not going to claim that with invented numbers - prices are per job on both sides. Get both in writing for the same model and compare. Our quotes are fixed after a survey, so ours at least will not move.
Who services the boiler afterwards?
With us, the same team that installed it - annual servicing across West, North West and South West London, which also keeps the manufacturer guarantee valid.
Can I check your registration like I can a big company's?
Yes, and you should - Gas Safe Register No. 623092. Check anyone who quotes you, national or local.

Want a clear, fixed price for your own home?

Want the comparison in writing for your own home? A survey and a fixed written quote.

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