⚠️ Boiler installation must be carried out by a Gas Safe registered engineer. Check registration at gassaferegister.co.uk before booking.³
You are about to spend serious money on a new boiler. Every installer listed here is Gas Safe registered and verified — right system, right fit, right paperwork. Not a £2,500 job that becomes a £4,000 regret.
✅ Public liability insurance, business and ID verified before listing
✅ Work guarantees available — confirm with your installer
✅ Gas Safe registered engineers — SE3, SE7, SE9, SE10, SE18 & surrounding areas
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Every listing is verified before it goes live — Gas Safe registration confirmed, insurance checked and contact details validated before approval.
Shortlist 2–3 installers, check what is included line by line, and call — most provide a fixed-price quote within 24 hours of the survey.
What a boiler installation actually involves
A boiler installation is not a swap. It is a process — and in Greenwich’s Victorian and Edwardian terrace stock, where pipe runs are non-standard and system configurations often have not been assessed in decades, shortcuts taken at installation show up as problems within two years.
Greenwich Council confirms that only Gas Safe-registered people can fit, alter or remove gas appliances or pipework.¹
A proper installation covers:
Registration with Building Control and issue of the Gas Safe Building Regulations Compliance Certificate. Removal and safe disposal of the existing boiler. Full assessment of system requirements, including radiator output, flow rates, flue positioning and appropriate boiler sizing.
Specification of the correct boiler output in kilowatts for your property. Supply and fitting of the new unit, system filter and scale reducer. A system clean — power flush or chemical flush — commonly required to support manufacturer warranty conditions.
Commissioning, testing and completion of the Benchmark checklist. Fitting of advanced controls such as weather compensation, which is a legal requirement under Building Regulations Part L for new gas boiler installations.
That last point matters more than most homeowners realise. When you sell your property, your solicitor will ask for the Building Regulations Compliance Certificate — the documentation your Gas Safe engineer is legally required to produce and submit. Any installer who does not mention this unprompted is not someone you want fitting a boiler.
When Greenwich homeowners replace their boiler
Age-related failure is the most common category. A boiler over 15 years old that has broken down, been condemned at its last service, or is beyond economic repair.
This is particularly common in Plumstead and Eltham where significant amounts of pre-2000 housing stock still runs on original or early-replacement units. The October and November rush is when these failures concentrate — getting ahead of that window with a planned replacement is cheaper than an emergency install in the middle of winter.
Efficiency-driven upgrade is the second category — homeowners moving from G-rated or F-rated boilers to modern A-rated units. With energy costs at current levels, the payback period on a correctly specified new boiler is shorter than it has been in years.
One clarification worth making: the government’s Boiler Upgrade Scheme funds heat pump installations only — gas boiler replacements do not qualify.⁴ The government also launched the Clean Heat Market Mechanism in April 2025, which requires boiler manufacturers to match a rising proportion of their boiler sales with heat pump installations — a scheme that may influence boiler pricing as manufacturers adjust to their obligations.⁵ For most Greenwich Victorian terraces, where insulation requirements and property configuration make heat pump installation complicated and expensive, a high-efficiency gas boiler remains the most practical and cost-effective solution.
System conversion is the most complex category and the most common source of underquoted jobs. Greenwich has a significant number of properties in Blackheath, Charlton and Kidbrooke still running on back boilers, gravity-fed hot water cylinders or outdated system configurations.
Back boiler removal, gravity-to-combi conversion and cylinder removal all involve additional pipework and labour that a lump-sum quote will bury. Always ask for a line-by-line breakdown on a conversion job.
Why boiler choice matters more in Greenwich
Greenwich’s hard water profile directly affects which boiler and which accessories make sense for your home — and any installer who does not raise this unprompted should be asked why.
Thames Water classifies Greenwich’s SE postcodes as hard water.² In hard water areas a magnetic system filter on the central heating return and a scale reducer on the cold water inlet are not optional extras.
They are the difference between a boiler that performs for 15 years and one that degrades in seven. Many manufacturers — including Worcester Bosch, Vaillant and Ideal — recommend or require a magnetic system filter to maintain warranty conditions.
Fitting a new boiler without one in a Thamesmead or Abbey Wood postcode and then claiming on warranty two years later is a conversation that ends badly. Performance in hard water areas can also vary between models — a good installer knows this and specifies accordingly.
What to expect from a boiler installation
The survey — before installation day. The installer visits, assesses your current system, checks radiator output and sizing, confirms flue position, and specifies the correct boiler output.
In a Victorian terrace in Woolwich or Charlton where pipe runs and system configurations are frequently non-standard, a quote without a survey is not a quote — it is a guess that gets revised once they are through the door.
Installation day. Old boiler out. System cleaned — either a power flush or a chemical flush with magna-cleanse.
New boiler, filter and scale reducer fitted. System filled, commissioned and tested. Radiators balanced using flow measurement to ensure the system reaches its full condensing efficiency — without this step, a modern A-rated boiler in a Victorian Woolwich or Charlton terrace will not deliver the performance it was specified for.
On completion. You receive the manufacturer’s warranty documentation, a completed Benchmark commissioning checklist, and the Gas Safe Building Regulations Compliance Certificate.
If any of these are missing at the end of the job, the installation is not complete — and you will feel the absence of that paperwork the moment you come to sell.
💡 Pro tip: Before your installer arrives, check whether your radiators have been balanced and bled recently. Cold spots indicate sludge in the system — and fitting a new boiler without flushing first pushes that sludge straight through a brand new heat exchanger. Ask your installer about a power flush or magna-cleanse if they have not already raised it. An installer who does not bring this up unprompted on a system over ten years old is cutting corners.
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Typical costs for boiler installation in Greenwich
What boiler installation costs in Greenwich — 2026
Greenwich and SE London pricing sits at the higher end of national ranges. Typical 2026 figures:
| Service | Typical London range 2026 |
|---|---|
| Like-for-like combi replacement | £2,800–£4,500 supply and fit |
| System boiler installation | £3,000–£4,800 supply and fit |
| Back boiler or gravity system conversion | £3,200–£5,000+ |
| Magnetic system filter (fitted) | £150–£250 |
| Power flush or magna-cleanse | £300–£500 |
Typical straightforward combi replacement in Greenwich: £2,800–£3,500 all-in including filter, commissioning and Gas Safe registration.
If a quote comes in significantly below these ranges, ask what has been left out. Every installer listed here provides a full itemised breakdown before any work is agreed.
Frequently asked questions — Boiler Installation Greenwich
Depends on your property and hot water demand. Combis heat water on demand — no cylinder needed, ideal for smaller homes and flats with one bathroom. System boilers work with a hot water cylinder and suit larger properties or homes with multiple bathrooms where simultaneous demand is high.
If you are in a larger Eltham semi or a converted Woolwich terrace with multiple bathrooms, the combi versus system question matters significantly — get it assessed properly before anything is ordered.
A straightforward like-for-like combi replacement takes one full day. A system conversion — removing a back boiler, relocating pipework, or changing from a gravity-fed system — runs to two days.
Your installer confirms the timeline after the survey. Anyone quoting a timeline before seeing the property is guessing.
Most major manufacturers offer between 5 and 12 years depending on the model and registration. The warranty is only valid if installed by a Gas Safe registered engineer, commissioned correctly, and — in most cases — fitted with a magnetic system filter.
Check what the warranty requires before agreeing a boiler model, and ensure your installer registers the unit on your behalf on completion.
No. The government’s Boiler Upgrade Scheme funds heat pump installations only — gas boiler replacements do not qualify.⁴ The scheme currently offers £7,500 for air source and ground source heat pumps.
For most Greenwich Victorian terraces, where insulation and property configuration make heat pump installation complex and expensive, a high-efficiency gas boiler remains the most practical solution. Your installer can advise on what is realistic for your specific property.
If your system is over ten years old, almost certainly yes. Sludge and magnetite built up in old pipework will circulate through your new boiler from day one, reducing efficiency and potentially voiding the manufacturer’s warranty.
A system clean before installation is significantly cheaper than a heat exchanger replacement two years later — and most reputable installers will recommend it without being asked.
Areas We Cover
Boiler installation engineers on this directory cover the full Greenwich borough. Find local help below:
- Boiler Installation North Greenwich
- Boiler Installation Charlton
- Boiler Installation Woolwich
- Boiler Installation Eltham
- Boiler Installation Blackheath
- Boiler Installation Kidbrooke
- Boiler Installation Abbey Wood
- Boiler Installation Thamesmead
- Boiler Installation Plumstead
- Boiler Installation Shooters Hill
Related guides
A new boiler is not a small decision. The wrong installer costs you twice — once on the job, once when the problems surface. In a Plumstead terrace or a Kidbrooke semi, you need someone who specifies the right system, fits it properly, and hands you every piece of documentation you are legally entitled to. Work guarantees available — confirm with your installer.
Get a Free Survey & Itemised Quote from a Verified Installer →
Sources & further reading
¹ Royal Borough of Greenwich — Repairing a problem when we cannot help https://www.royalgreenwich.gov.uk/housing/request-repair/repairing-problem-when-we-cannot-help
² Thames Water — Hard water https://www.thameswater.co.uk/help/water-and-waste-help/water-quality/hard-water
³ Gas Safe Register — Find or check a Gas Safe registered engineer https://www.gassaferegister.co.uk/find-an-engineer-or-check-the-register/
⁴ GOV.UK — Apply for the Boiler Upgrade Scheme: What you can get https://www.gov.uk/apply-boiler-upgrade-scheme/what-you-can-get
⁵ GOV.UK — Clean Heat Market Mechanism https://www.gov.uk/government/consultations/clean-heat-market-mechanism-revisions-ahead-of-scheme-year-2-20262027
Last reviewed: April 2026