Emergency Plumbing & Boiler Repair · Fulham, London
Boiler Installation & Replacement in Fulham
Replacing a boiler in a Fulham house is not the same as swapping one box for another. The boiler may sit in a kitchen cupboard on a party wall, the flue may have to cross a conservation area's street elevation, and the pipework it connects to may date from the same decade as the house. Emergency Plumber Fulham arranges boiler replacement through partner heating companies on 07898 117754, with a written quote, a flue plan and a notification to building control.
The first decision is the type. A combi boiler heats water on demand with no cylinder, and suits flats and smaller houses with one or two bathrooms. A system boiler works with an unvented cylinder, and suits larger households that want hot water at several taps at once. A regular boiler with a tank in the loft still serves some older houses where a pressurised supply would strain the pipework. The partner explains which fits, given your mains pressure and number of bathrooms.
Fulham's housing shapes the choice. Large Victorian houses in Parsons Green with lofts and basements converted often outgrow a single combi, whereas the one-bedroom flats of SW6 and West Kensington's mansion blocks suit one well. Thames Water's supply is hard, 266 mg/l in its 2025 City-zone report, so a magnetic filter and a scale-conscious specification are worth including, and installation must follow the manufacturer's instructions, Building Regulations Part L for efficiency and Part J for flues.
The partner company carries out the installation, invoices you directly and takes payment itself. We handle no money. We text you the company's name before they arrive and, if anything is wrong afterwards, you ring this number and we chase it. For a boiler that might still be saved, see boiler breakdown repair; for upkeep afterwards, annual boiler service.
What We Do
Choosing Between Combi, System and Regular
The right boiler depends on the house, not the brochure.
Combi Boilers for Flats and Smaller Houses
A combi gives instant hot water with no cylinder, which suits a Fulham flat or a two-bedroom terrace. Published 2026 London ranges put fitted budget combis at about £2,500 to £3,400, mid-range at £3,100 to £4,400 and premium at £3,900 to £5,500. The limit is flow: two showers at once will strain a combi, and the partner will check your mains pressure before recommending one.
System Boilers and Unvented Cylinders
A system boiler with an unvented cylinder stores hot water at mains pressure, which suits a larger house with several bathrooms. The cylinder falls under Building Regulations Part G3, so safety devices and discharge pipework are specified as well as the boiler. The pair is a bigger investment, and the partner's quote will show the boiler, cylinder and associated work separately.
Regular Boilers and Keeping an Existing System
A regular boiler with a loft tank and vented cylinder is still the right choice in some older houses where the plumbing could not cope with mains pressure. Replacing like for like can be cheaper and less disruptive, but the partner should explain when converting to a system boiler is worthwhile. The decision is yours, and the written quote should set out both options.
The Benefits
What a Proper Replacement Includes
The boiler is only part of the price, and the rest is where good and poor installations diverge.
Flue Planning and Building Regulations Notification
Boiler replacement is notifiable under Part L, and the flue is covered by Part J, so the work must be notified to building control, which in Fulham is Hammersmith and Fulham's team. The partner plans the flue route and terminal position in advance, which matters especially in a conservation area. Ask for the compliance certificate when the job is done.
Cleaning the System and Protecting the New Boiler
Fitting a new boiler to a sludgy system shortens its life. A good installation includes cleansing the circuit, to BS 7593 where a power flush is warranted, fitting a magnetic filter and adding inhibitor. In hard-water Fulham, that protection is part of the value of the installation, and the partner should itemise it in the quote.
Controls, Commissioning and Handover
A modern installation includes a programmable thermostat or smart control, ideally with weather compensation or load compensation, which saves fuel. The partner commissions the boiler to the manufacturer's instructions, records the readings, registers the warranty and shows you how it works. You should receive the paperwork, not just a working boiler.
Why Us
Replacement Questions Specific to Fulham Buildings
A quote that ignores the building is a quote that will change.
Parsons Green Flues and Article 4
Parsons Green is a conservation area where Hammersmith and Fulham operates Article 4 directions limiting some external alterations, so a flue terminal on a street-facing wall can be contentious. Taking the flue out the back or side is the usual answer. See our Parsons Green area page for how that tends to work.
Mansion-Block Flats and Lease Clauses
In West Kensington's 1890s mansion blocks, the flue route, a roof or external terminal and the pipe route through shared walls may need the freeholder's consent. Ask your managing agent early, and tell us about the building when you call so the partner can plan for it. Our West Kensington page describes the local building types.
Loft Conversions and Cupboard Boilers
Fulham's loft-converted terraces often have boilers in cupboards or roof spaces with long flue runs and condensate pipes that can freeze, and clearance rules for flues and combustible materials apply. The partner measures before quoting, which prevents an on-the-day surprise.
Before You Sign a Boiler Quote
What a Fair Written Quote Lists
A useful quote names the boiler make, model and output in kilowatts, the flue kit, a magnetic filter, the controls, system cleansing, removal of the old boiler, labour, making good and the building control notification. It should also state the warranty length and what it depends on. If a figure is lumped together as a single number, ask for it to be itemised, because that is how you compare two quotes properly.
Sizing, Heat Loss and Not Over-Specifying
A bigger boiler is not a better boiler. An oversized unit short-cycles, switching on and off, which wastes fuel and wears parts, and many Fulham flats need less output than the old boiler had, since insulation and windows have improved. The partner should size the new boiler to the heat loss of the home and the hot water demand, and explain the reasoning in plain terms.
Planning for Days Without Hot Water
A like-for-like swap often takes a day, but a relocation or a new cylinder can run to several. Heating and hot water are off while it happens, so avoid scheduling the work for the coldest week if you can. Ask the partner whether they can leave you with a temporary heater or hot water overnight, and whether the system will need a second short visit for commissioning or inspection.
If your current boiler might still be saved, see boiler breakdown repair; if a cylinder is involved, see hot water cylinder repair; and for whole-system issues, central heating repair. The Fulham plumbing page has the overview, or ring 07898 117754.
Frequently Asked Questions
How much does a new boiler cost in London in 2026?
Published 2026 London ranges put a fitted budget combi at about £2,500 to £3,400, a mid-range combi at £3,100 to £4,400 and a premium model at £3,900 to £5,500, with a like-for-like swap often around £2,500. A system boiler with a new unvented cylinder is considerably more, at roughly £5,600 to £9,200 for the pair. The partner will give you a written quote showing the boiler, flue, filter and labour, and you can compare it with those ranges.
Combi, system or regular boiler: which is right for my Fulham house?
A combi suits a flat or small house with one or two bathrooms and decent mains pressure, because it needs no cylinder. A system boiler with an unvented cylinder suits a larger house where several taps run together, while a regular boiler with a tank is mainly for older houses where mains pressure would strain old pipework. The partner will check your mains flow and bathrooms and explain which they would choose and why.
Is boiler replacement something building control needs to know about?
Yes. Replacing a boiler is notifiable work under Building Regulations Part L, which covers energy efficiency, and the flue falls under Part J. In Fulham, the local authority is Hammersmith and Fulham, and a competent installer notifies it or arranges the required certificate. You should receive a compliance certificate afterwards, which is worth keeping for a future sale. The partner will explain the process in the quote.
Will the flue be visible from the street in a conservation area?
It depends on the building and the route. In Parsons Green's conservation area, Hammersmith and Fulham applies Article 4 directions that limit some external alterations, so flue terminals are normally taken to the rear or side wall where they cannot be seen from the public realm. That may add pipework inside the house. If your house is listed, visible external works may need separate consent, so mention it when you call.
How long does a boiler replacement take?
A like-for-like combi swap often takes one day, while moving the boiler, changing the flue route, adding a cylinder or cleansing the system can take two or three. Heating and hot water are normally off during the work. The partner will tell you the expected duration in the quote, and we recommend avoiding a start date close to the coldest weather, if you can choose.
Do I need a power flush when I replace my boiler?
Not always, but if the radiators have cold spots and the water is black with sludge, cleansing is sensible to protect the new boiler. A power flush follows BS 7593 for treatment of heating systems, and in London costs roughly £450 to £950 depending on the number of radiators on published 2026 ranges. A cheaper chemical clean plus a magnetic filter is sometimes enough. The partner should test the system water first.
Can I keep my old cylinder when I get a new boiler?
Often yes, if it is in good condition and compatible with the new boiler. A combi replaces both the boiler and the cylinder, so the cylinder would be removed. If you keep a cylinder, the partner will check its coil, controls and safety devices, and if it is unvented, Building Regulations Part G3 applies. A scaled or leaking old cylinder may be better replaced during the same visit, and the quote can show both.
What warranty should I expect on a new boiler?
Manufacturers offer warranties that typically range from two to ten years or more, often conditional on professional installation, commissioning and annual servicing. The partner should register the warranty and give you the paperwork, and the installation itself should come with a separate guarantee on workmanship from the company. Read the terms before you sign, and keep the documents with the service records.
Will hard water affect my new boiler?
It can. Thames Water's 2025 report gives 266 mg/l calcium carbonate for the City supply area, and hard water scales heat exchangers and cylinder elements over time. A magnetic filter protects against sludge, and a scale inhibitor or softener helps with scale, though neither is a complete cure. Annual servicing is the best defence, and some manufacturers require it to keep the warranty valid.
How do I get a quote for a new boiler in Fulham?
Ring us on 07898 117754, tell us about the property, the existing boiler and what is not working, and we will match a partner heating company. They will usually visit to see the boiler, flue route and pipework before giving a written quote, which should show the boiler model, flue, filter, controls, labour and any extras. You can compare it with other quotes, and you are under no obligation to accept.
Planning a New Boiler? Get a Written Quote
A partner heating company, flue plan and notification included. Call 07898 117754.
07898 117754