Gas · Heating · Plumbing — Harlow & Bishop's Stortford
744 five-star reviews, and every one earned on the job.
D.A Gas, Heating & Plumbing is a Gas Safe registered team founded by David Armstrong in 2015, covering Harlow, Bishop's Stortford and across Hertfordshire and Essex. Boiler installs and services, breakdowns, powerflushing and everyday plumbing — done to a standard our customers keep coming back for.
“Fantastic service from DA Gas as always. The engineer showed up at the time I was given. The work was to a high standard and he kept the place clean and tidy during his visit. We will always recommend DA Gas to anyone looking for works to be done.”
744
Five-star Google reviews
5.0
Straight rating, every review
Since 2015
Founded by David Armstrong
Gas Safe
Registered engineers
Local · Gas Safe · established 2015
The volume of five-star reviews is the whole story: 744 of them, and not one below five stars.
D.A Gas, Heating & Plumbing was founded in 2015 by David Armstrong and has grown into a team of seven — a director, an office manager, three gas engineer-plumbers, a plumber and an apprentice — working out of Harlow and covering Bishop's Stortford, Sawbridgeworth, Epping and the surrounding Hertfordshire, Essex and London-border areas.
Most trades are pleased with a few dozen reviews. D.A Gas has 744, every one at five stars, with fresh ones arriving several times a week. Read them and the same words come up again and again: on time, clean and tidy, honest, no upselling, photos to show you what's wrong, and prices agreed clearly before any work starts. That's the reputation the whole business is built on.
What we do
Boilers, heating and plumbing — done properly.
Boiler Installation
New high-efficiency Worcester Bosch and Baxi boilers — free quotes, finance available and long manufacturer guarantees.
Boiler Service
Annual boiler health-check from £85 inc VAT — heat exchanger, gas pressure and flue all inspected.
Boiler Repairs
Fault diagnosed and fixed across Worcester Bosch, Vaillant, Baxi and Glowworm — 10+ years of breakdowns behind us.
Central Heating Installation
Full system installs — boiler, radiators, thermostat, valves and pumps, sized room by room.
Emergency Plumbing
Fast-response call-out for leaking or burst pipes and boiler breakdowns — Gas Safe engineers available.
General Plumbing
Leaks, blockages, taps, showers and pumps — the everyday plumbing that keeps a home running.
Powerflushing
High-velocity flush that clears rust, sludge and debris so your heating warms up evenly again.
Gas Safety Certificates (CP12)
Landlord CP12 certificates covering every gas appliance — often the same day.
Smart Thermostat Installation
App-controlled heating with room-by-room control, remote management and monthly energy reports.
Plus dedicated local gas engineer cover in Epping, Great Dunmow and Hoddesdon.
Approved & accredited
The credentials behind the work.
Gas Safe Registered
Every gas job carried out and certified by Gas Safe registered engineers — the legal register for anyone working on gas in the UK.
Worcester Bosch Accredited Installer
Approved to fit Worcester Bosch boilers with manufacturer guarantees of up to 12 years on the Greenstar 8000 Style.
Baxi Approved Installer
Accredited to install Baxi boilers with up to 10 years' parts-and-labour warranty registered direct with the manufacturer.
Which? Trusted Trader
Independently assessed and endorsed under the Which? Trusted Traders scheme.
Checkatrade Member
A verified Checkatrade member — reviews and credentials open for anyone to read.
G3 / BPEC Unvented Qualified
Qualified to install and service Megaflo and other sealed, pressurised unvented hot-water cylinders.
Brands we install & service
Our work
Real jobs, our own photographs.
A new Baxi 600 combi boiler installed in an airing cupboard — copper pipework run neatly, system filter fitted and the D.A Gas service record left on the door.
A period bathroom plumbed and finished — basin unit, panelled bath with mixer, patterned floor and a traditional pull-cord light, all left clean.
A cloakroom basin and brushed-brass mixer tap fitted and tested — mains pressure running true over a wood-effect vanity in a navy-tiled WC.
744 reviews, not one below five stars
“What really sets them apart is their honesty — if something doesn't need fixing, they'll tell you.”
★★★★★ — Cari Tottman, via Google
“Fantastic service from DA Gas as always. The engineer showed up at the time I was given. The engineers work was to a high standard and he kept the place clean and tidy during his visit. We will always recommend DA Gas to anyone looking for works to be done.”
“D.A Gas provided a fantastic service end to end. Very responsive, quality work, and very good price. I would absolutely recommend them. I needed a Gas Safety Certificate and they came out same day. Very impressed”
“They were on time, clean, polite and located the issue in a timely manner. I was informed every step of the appointment of what they were doing. They took photos to show me what was causing the leak and sent these photos to me along with contact details for a roofer. Very honest in their opinion. I…”
“DAGas have such a great reputation and the service I got lives up to those standards. Dave, the engineer kept everything clean and finished the job super quickly. Really upfront with the quotes and what needed to be done. Couldn't be happier.”
Recent jobs
The job, and what the customer said.
Fantastic service, as always
“Fantastic service from DA Gas as always. The engineer showed up at the time I was given. The work was to a high standard and he kept the place clean and tidy during his visit. We will always recommend DA Gas.”
★★★★★ — Ash Harrison, via Google
A CP12 certificate, out the same day
“D.A Gas provided a fantastic service end to end. Very responsive, quality work, and very good price. I needed a Gas Safety Certificate and they came out same day. Very impressed.”
★★★★★ — sausages7, via Google
On time, and honest about the fix
“They were on time, clean, polite and located the issue in a timely manner. They took photos to show me what was causing the leak and sent these to me. Very honest in their opinion. I would have them back again.”
★★★★★ — Siobhan Moore, via Google
No upselling, just honest advice
“I've been using DA Gas for years across my own home and 2 rental properties. If something doesn't need fixing, they'll tell you. No upselling, no unnecessary work — and always transparent with pricing before any work is carried out.”
★★★★★ — Cari Tottman, via Google
How we work
Tell us the fault, get a straight price, job done.
01
Tell us what's happening
Call 01279 316304 or send the details — a photo of the boiler, the fault code or the leak helps us arrive ready. For a boiler service or a landlord certificate, we'll book you a slot that suits.
02
A clear price, agreed first
You'll hear straight what's involved and what it costs before we start — a boiler service from £85 inc VAT, free quotes on new boilers, and finance available on installs. Reviewers use the same word for it: transparent.
03
Done properly, left clean
A Gas Safe engineer arrives when we say, explains and often photographs what they find, completes the work to standard and leaves your home clean and tidy — with your paperwork and any manufacturer guarantee registered.
Where we work
Harlow based, right across Hertfordshire, Essex and the London borders.
We cover Harlow, Bishop's Stortford, Sawbridgeworth, Epping, Stansted, Great Dunmow, Hoddesdon, Ware and the surrounding areas — for homeowners, landlords and local businesses. We've carried out work as far as Colchester and Enfield too. Not sure you're in reach? Just ask.
See the towns we coverBoiler due a service — or playing up?
Call the office, or send the details and we'll come back to you.