A new boiler is a regulated installation, not just a swap — Gas Safe registration, the Boiler Plus efficiency standard, Building Regulations notification and proper commissioning all apply. Here’s what a correct installation involves, and the paperwork you should end up holding.

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Contact verified boiler installation plumbers in Ealing ↓

Coverage: W3, W5, W7, W13, UB1, UB2, UB5 and UB6, plus the NW10 fringe around North Acton and Park Royal.
What this covers: new and replacement gas boilers — combi, system and heat-only — installed, commissioned and certified by a Gas Safe registered engineer, including controls to meet the Boiler Plus standard.
Not this page: a boiler that’s broken rather than being replaced is boiler repair; the annual check afterwards is boiler servicing; radiator and pipework upgrades are central heating repair.
Costs: a multi-hundred-to-multi-thousand-pound job — see what it costs.
Availability: planned work — book ahead and get itemised quotes.

Jump to: What a proper install involves · The rules: Boiler Plus and Building Regs · Sizing and system type · Efficiency and running costs · Safety first · By district · Costs · FAQs

What a proper installation involves

A boiler installation done properly is more than lifting out the old unit and hanging a new one. It includes a survey of the home — checking, among other things, that the existing gas pipework is correctly sized for the new boiler, not just that the boiler fits on the wall; choosing the right boiler type and size; positioning the boiler and flue correctly, with the engineer able to inspect and set the flue route, its terminals, seals and a safe discharge point. Flue terminal position matters in flats and terraces — nearby windows, balconies, boundaries and shared walkways can rule out an otherwise convenient boiler position — and the installer should confirm the manufacturer’s clearance requirements around cupboards, boxing and service access before quoting, since a boiler crammed into a space that can’t be serviced is a problem deferred. It also includes making the gas, water and electrical connections safely; protecting the new boiler from the existing system’s debris; fitting the controls the regulations now require; commissioning the boiler to the manufacturer’s procedure; and leaving you with the right certificates. On a like-for-like combi swap that can be a day’s work; a change of system type, a relocation or a flue re-route takes longer.

The detail that separates a good install from a future problem is mostly invisible. A good installer assesses the existing system’s cleanliness before deciding whether a power flush, a chemical clean or a filter-only approach is right, fits a magnetic filter so existing sludge doesn’t damage the new heat exchanger, and adds an inhibitor on final fill. Condensate routing matters too — ideally to an internal waste, and the installer should confirm the existing route can safely accept the new boiler’s discharge; where gravity discharge to an internal waste isn’t practical, they should explain whether a condensate pump or a properly lagged external route is needed (the frozen-pipe problem starts with a poorly run external condensate). Commissioning should be recorded, not skipped. A cheap quote that omits system cleaning or protection may be false economy — and one honest caveat worth hearing: a new boiler alone won’t fix undersized radiators or poor circulation, so a good installer flags where emitter or pipework upgrades are needed for the system to actually perform.

The rules: Boiler Plus and Building Regulations

Two regulatory layers apply to every new gas boiler in England, and a good installer handles both as a matter of course.

Boiler Plus is the efficiency standard in force since April 2018. The GOV.UK factsheet sets the requirements: new domestic gas boilers must meet a minimum efficiency of 92% ErP; time and temperature controls are required for all gas and oil boiler installations; and a new combi boiler must additionally include one of four measures — flue gas heat recovery, weather compensation, load compensation, or smart controls.¹ If a quote for a combi doesn’t mention which of those four measures it includes, ask — it’s a legal requirement, not an upsell.

Building Regulations. A boiler is a heat-producing appliance, and its installation is notifiable. A Gas Safe registered installer self-certifies the work and notifies the local authority², and the Gas Safe Register then informs the local authority and a Building Regulations Compliance Certificate is issued to you, typically within 10–15 working days.³ Keep that certificate — it confirms the installation met the regulations, including the Part L energy-efficiency and Part J combustion-and-flue requirements that sit behind it, and a solicitor may ask for it when you sell. Alongside it you should receive a completed Benchmark commissioning checklist, which records that the boiler was commissioned to the manufacturer’s instructions and validates the warranty — which often also depends on keeping up annual servicing, correct commissioning, fitting manufacturer-approved controls, and evidence of suitable system water treatment.²

It is, throughout, a legal requirement that the work is carried out by a Gas Safe registered engineer — HSE confirms this, and the engineer’s ID card shows the categories they’re qualified for.⁴ Check it, and confirm the registration on the Gas Safe Register.⁵ In a leasehold flat, confirm freeholder or managing-agent approval before altering flues, external terminals, shared boxing or visible condensate runs.

Sizing and system type

Getting the boiler type and size right is where an installation succeeds or disappoints. Combi boilers heat water on demand with no cylinder — efficient and space-saving, ideal for smaller homes and flats, but flow can struggle where several outlets run at once. System boilers work with a hot-water cylinder, better for homes with more than one bathroom and steady simultaneous demand. Heat-only (regular) boilers suit homes with traditional tank-and-cylinder setups, which may still be in place in older Ealing houses, where a full system change isn’t wanted.

Sizing matters as much as type: an oversized boiler cycles wastefully, an undersized one can’t keep up, and the right output depends on the home’s heat demand, hot-water needs and radiator load — not a round number. A good installer assesses the property rather than reaching for a default. The combi vs system boiler guide works through the choice. Two kinds of protection matter for a new boiler, and they’re not the same thing: a magnetic filter and an inhibitor, with proper system cleaning, guard against sludge and corrosion debris; limescale is separate, and Ealing’s hard water — confirmed by Affinity Water¹⁶ and Thames Water across the borough’s two supply areas¹⁷, with the Drinking Water Inspectorate linking hardness to scale¹¹ — argues for considering scale protection too, such as a scale reducer or the softener conversation, as part of the install planning rather than an afterthought.

Efficiency and running costs

A new A-rated condensing boiler is substantially more efficient than an old one — the Boiler Plus minimum of 92% ErP¹ compares with much lower figures for boilers a couple of decades old, which is where the running-cost saving comes from. The Energy Saving Trust publishes current estimates of the annual saving from replacing an old G-rated boiler with a new A-rated one plus a full set of controls⁶ — the figure depends heavily on the home, the old boiler and how the heating is used, so check the Energy Saving Trust for the estimate that fits your situation rather than treating any single number as a promise. Pairing the new boiler with good controls, and addressing scale in Ealing’s hard water, is what protects that efficiency over time.

On grants, one point to be clear about: the government’s Boiler Upgrade Scheme funds low-carbon heating and does not fund replacing one gas boiler with another. Ofgem sets the current grants at £7,500 towards air-to-water, ground-source and water-source heat pumps, £2,500 towards air-to-air heat pumps, and £5,000 towards biomass boilers (the last in limited, rural, off-gas-grid circumstances).⁷ So if a quote implies a grant against a gas boiler, that’s a flag to question — and because these levels change, check Ofgem for the current position. A heat pump is a different decision with different economics; a gas boiler replacement stands on its own running-cost case.

Safety first

Gas. Any new gas appliance must be installed by a Gas Safe registered engineer — and if you ever smell gas, National Gas sets out the steps: call the National Gas Emergency Service immediately, free, on 0800 111 999; don’t touch switches or naked flames and don’t smoke; open doors and windows if it’s safe; turn off at the meter control if you can reach it; and leave the property if the smell is strong or anyone feels unwell, calling from outside.⁸

Carbon monoxide. A correctly installed and commissioned boiler is a safe one, which is exactly why commissioning matters. Gas Safe lists the warning signs of CO poisoning — headaches, dizziness, nausea, breathlessness, collapse and loss of consciousness — and the signs of a possible leak: a floppy yellow or orange flame rather than a crisp blue one, dark sooty staining around the appliance, pilot lights that frequently blow out, and increased condensation.⁹ If you suspect CO — or a CO alarm sounds — treat it as an emergency: get fresh air and open doors and windows, turn off the suspected appliance if it’s safe, leave the property, and call the Gas Emergency Helpline on 0800 111 999. Get medical advice as soon as possible — NHS 111 if you suspect CO poisoning, or 999 or A&E for severe symptoms such as difficulty breathing, sudden confusion or loss of consciousness.⁹ Don’t use the appliance again until a Gas Safe registered engineer confirms it’s safe. A new installation is the natural moment to fit or check an audible CO alarm to BS EN 50291.¹⁰

Electrics. A boiler is wired into the home’s electrics, and any associated electrical work in the dwelling falls under Part P of the Building Regulations — a qualified electrician’s domain where it goes beyond the boiler’s own connection.

Water. A new install is also the moment to confirm you know your inside stop valve and the system’s filling and isolation points — your installer can point them out, and it’s the knowledge that limits damage if anything ever leaks.

Find a verified boiler installer by district

Installation needs aren’t strongly postcode-specific, but Ealing’s housing shapes the system choice and the job — and in some flats it’s worth confirming the boiler is even yours to install before quoting.

Acton (W3, parts NW10). Period terraces that may still run a heat-only or system boiler with a cylinder, alongside the newer Acton Gardens blocks¹², where compact boiler cupboards, concealed pipework and condensate termination need planning. Above-shop flats around the High Street, and newer or mixed-use blocks on the North Acton and Park Royal (NW10) fringe, can make flue siting and access harder.

Ealing (W5, W13). Conversion flats where a combi often suits the space — and where the installer may need to confirm the flue route, condensate discharge and boiler-cupboard clearances, plus any shared-access or freeholder/managing-agent approval (needed before altering flues, external terminals, shared boxing or visible condensate runs), before quoting.

Greenford (UB6, parts UB5) and Northolt (UB5). Many homes being moved from older tank-and-cylinder setups to modern systems — but in some estate and purpose-built blocks, including parts of estates such as Golf Links in south Greenford¹³, heating can be communal, so a private boiler installation isn’t always the household’s to arrange. Check with the landlord, council or managing agent first.

Hanwell (W7). Older houses where older tank-and-cylinder setups may still be in place — and where an older boiler tucked into an airing cupboard, or legacy pipework, can shape a like-for-like swap versus a considered system change. Sizing to the home’s real demand matters.

Perivale (UB6). Many older homes where, if a boiler is clearly old, the efficiency gain from replacing it is real — and where the install is the moment to protect the new boiler from an old system’s scale and sludge. A per-property judgement rather than a blanket one.

Southall (UB1, UB2). Where a home has high simultaneous hot-water demand, a system boiler with a cylinder can suit better than a combi — a sizing judgement made per property. Above-shop flats around the Broadway can complicate flue siting and access.

What it costs

A boiler installation is a significant job, so the quote detail matters more than almost anywhere on this site. Ask for itemisation, whether a system flush and filter are included, which Boiler Plus measure the combi includes, what controls are fitted, and what warranty the boiler and the workmanship carry.

Editorial estimate only, for orientation. These are NOT regulated rates, NOT market data and NOT a published cost survey — boiler choice, system changes and access change the price substantially. Always get an itemised written quote.

There is no official price list for boiler installation in Ealing. Local cost context: Ealing is inside London’s ULEZ¹⁴, and the council’s infrastructure evidence records half the borough’s road network as covered by controlled parking zones¹⁵ — a day or more of installer parking can reasonably appear on a quote. For reading any quote line by line, see how to read a plumbing quote.

Frequently asked questions

Why verified plumbers — not a general directory

A boiler installation is a four-figure, safety-critical, regulated job — and the wrong installer can leave you with an uncertified, inefficient or unsafe system, and no paperwork when you come to sell. That’s why every listing here is checked before going live and re-verified annually: we confirm the business is legitimately trading and verify the named contact, we check evidence of public liability insurance, and we confirm the plumber covers Ealing’s W and UB postcodes before a profile is approved.

Because installation is gas work, Gas Safe registration is the central check — we confirm it directly with the Gas Safe Register, and you should confirm the engineer’s registration and qualified categories, and make sure they notify the installation so your Building Regulations Compliance Certificate arrives. For water-fittings work on the wider system, plumbers can also be looked up on WaterSafe. Profiles may be suspended or removed if credentials lapse or credible concerns are raised — see the full verification process →

There’s no pay-to-play ranking of listings and no customer middleman fee: enquiries go directly to the plumber.

Related areas

Verified boiler installers across Ealing’s neighbourhoods, including:

• Acton
• Brentham Garden Suburb
• Central Greenford
• Dormers Wells
• Ealing Broadway
• Ealing Common
• East Acton
• Greenford
• Greenford Broadway
• Hanger Hill
• Hanwell
• Hanwell Broadway
• Lady Margaret
• Montpelier
• North Acton
• North Ealing
• North Greenford
• North Hanwell
• Northfields
• Northolt
• Northolt Mandeville
• Northolt West End
• Norwood Green
• Perivale
• Pitshanger
• South Acton
• South Ealing
• Southall
• Southall Broadway
• Southall Green
• Southall West
• Walpole
• West Ealing

Related services

Other verified plumbing services in Ealing:

• Emergency Plumber in Ealing
• Burst Pipes in Ealing
• Leak Detection in Ealing
• Blocked Drains in Ealing
• Toilet Repairs in Ealing
• Tap Repair & Installation in Ealing
• General Plumbing in Ealing
• Bathroom Plumbing in Ealing
• Kitchen Plumbing in Ealing
• Washing Machine & Dishwasher Installation in Ealing
• Boiler Repair in Ealing
• Boiler Servicing in Ealing
• Central Heating Repair in Ealing
• Commercial Plumbing in Ealing

Related guides

• Combi vs System Boiler — A UK Guide 2026
• Boiler Repair or Replace? A London Guide 2026
• London Plumbing Costs & Compliance Guide 2026
• How to Read a Plumbing Quote — A London Homeowner’s Guide 2026

A new boiler in Ealing is a regulated, certified, properly commissioned installation — Boiler Plus, Building Regulations, the flush, the filter, the paperwork — not a quick swap. The verified plumbers listed above are Gas Safe registered and do it by the book, so you end up with an efficient boiler and the certificate to prove it.

Contact verified boiler installation plumbers in Ealing ↑

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Last reviewed: June 2026 by Adiel Khan — SFEDI-accredited business advisor 20+ years experience (South East Enterprise Ltd) and operator of VerifiedPlumbers. LinkedIn ↗

This page is checked for compliance and regulatory accuracy against the regulations and bodies cited on this page, including the Gas Safety (Installation and Use) Regulations 1998 and HSE guidance, the Boiler Plus standard, the Building Regulations (Part L and Part J), National Gas, Gas Safe Register, the Energy Saving Trust, Ofgem, the Drinking Water Inspectorate, Affinity Water, Thames Water, Ealing Council and Transport for London. Source links are provided within this page where relevant.

Sources & further reading

1. GOV.UK / BEIS (Boiler Plus factsheet — 92% ErP, controls, combi measures) — https://assets.publishing.service.gov.uk/media/5b2cc1e2ed915d586e2d8fe9/Boiler_Plus_Factsheet_v3.pdf
2. Gas Safe Register (new gas appliance installation — notification and Benchmark) — https://www.gassaferegister.co.uk/gas-safety/home-gas-safety/new-gas-appliance-installation/
3. Gas Safe Register (Building Regulations certificate — self-certification, 10–15 working days) — https://www.gassaferegister.co.uk/gas-safety/gas-safety-certificates-records/building-regulations-certificate/
4. HSE (who can carry out gas work — Gas Safe Register, ID-card categories) — https://www.hse.gov.uk/gas/domestic/newschemecontract.htm
5. Gas Safe Register (check an engineer) — https://www.gassaferegister.co.uk/
6. Energy Saving Trust (boiler types and efficiency guidance) — https://energysavingtrust.org.uk/advice/boilers/
7. Ofgem (Boiler Upgrade Scheme — current grant levels) — https://www.ofgem.gov.uk/environmental-and-social-schemes/boiler-upgrade-scheme-bus
8. National Gas (gas emergency — what to do, 0800 111 999) — https://www.nationalgas.com/emergency-contacts
9. Gas Safe Register (carbon monoxide poisoning — symptoms, signs and what to do) — https://www.gassaferegister.co.uk/gas-safety/carbon-monoxide-poisoning/
10. HSE (domestic gas safety FAQs — CO alarms to BS EN 50291) — https://www.hse.gov.uk/gas/domestic/faqs.htm
11. Drinking Water Inspectorate (hardness and scaling) — https://www.dwi.gov.uk/consumers/learn-more-about-your-water/water-hardness-hard-water/
12. Ealing Council (South Acton Estate regeneration) — https://www.ealing.gov.uk/info/201104/housing_regeneration/377/south_acton_estate
13. Ealing Council (Golf Links estate — about the estate) — https://www.ealing.gov.uk/site/scripts/documents_info.php?documentID=372
14. Transport for London (Ultra Low Emission Zone) — https://tfl.gov.uk/modes/driving/ultra-low-emission-zone
15. Ealing Council Infrastructure Delivery Plan, Part One: Infrastructure Baseline Report, Feb 2024 (CPZ coverage) — https://www.ealing.gov.uk/download/downloads/id/19508/part_one_infrastructure_baseline_report.pdf
16. Affinity Water (water hardness) — https://www.affinitywater.co.uk/water-quality/hardness
17. Thames Water (hard water) — https://www.thameswater.co.uk/help/water-and-waste-help/water-quality/hard-water