Emergency Plumbing & Boiler Repair · Wandsworth, London
Boiler Installation & Replacement in Wandsworth, London
Replacing a boiler is the biggest heating decision most households make in a decade, and it is usually forced on them: the old boiler fails in the coldest week of the year. [24HR Boiler Repair & Plumber](/) answers 24 hours a day on 07727 932887 and arranges boiler installation and replacement through independently owned partner companies, so an emergency swap and a planned upgrade start with the same call.
Published London prices for a new combi boiler, fully installed, run from roughly £2,000 to £3,500 in 2026, with system and regular boilers and bigger homes higher. That range depends on the boiler's output, whether the flue has to move, how much pipework changes and what controls go in. The partner company surveys the property and gives a written quote for the whole job before any work starts.
New gas boilers in England have to meet Building Regulations Part L, which sets a 92% minimum seasonal efficiency, and under the Boiler Plus rules a combi also needs time and temperature controls plus one further energy-saving measure. Installation follows the manufacturer's instructions and the Gas Safety (Installation and Use) Regulations 1998, and the work is notified to building control as the regulations require.
Wandsworth homes bring their own questions. A Victorian terrace in Earlsfield or an Edwardian one on the Southfields Grid has limited space, often a cupboard boiler and a flue that must reach an outside wall; a Putney Hill villa may have a conservation-area elevation where a flue terminal on the street side needs thought. Sort those details before the old boiler comes off the wall.
Timing matters. A planned replacement in spring or summer is easier to book, easier to quote and rarely rushed, while an emergency replacement in January is limited by stock and diaries. If your boiler is more than fifteen years old, has had several repairs, or is no longer efficient, asking for a quote now costs nothing and puts you in a better position when the day comes.
What We Do
Which Boiler for Which Home
The right boiler depends on how many bathrooms you have, how much space there is and how your hot water is stored.
Combi Boilers for Flats and Small Terraces
A combi heats water on demand, so it needs no cylinder or tank, which suits the converted flats and narrow terraces common in Wandsworth. It works best with one bathroom and decent mains pressure. The trade-off is that two showers at once can drain it, and in a hard-water area the compact heat exchanger needs protecting with a filter and regular servicing.
System and Regular Boilers With a Cylinder
Larger homes with two or more bathrooms often do better with a system boiler and an unvented cylinder, which gives mains-pressure hot water to several outlets at once. A regular boiler with tanks still suits some older houses. Unvented cylinders are fitted to Building Regulations Part G3 with the safety devices and discharge pipework a pressurised system requires.
Flues, Pipework and Controls
The flue route, condensate run and heating controls decide as much about a good installation as the boiler itself. Moving a boiler can mean a new flue through a brick wall and new pipework. Controls must meet Part L, and a cleansed system with a magnetic filter protects the new boiler, because dirty water from an old circuit can kill it early.
The Benefits
How a Replacement Is Run
A replacement is a project with steps, and you should know what each one is.
Survey and Written Quote
The partner company visits, checks the existing system, flue and space, and gives a written quote that covers the boiler, installation, controls, filter and making good. You see the price before any work starts.
Installation to the Rules
The old boiler is removed and the new one fitted to the manufacturer's instructions, Part L and the Gas Safety (Installation and Use) Regulations 1998, then commissioned and the system cleansed and protected.
Handover and Paperwork
You should receive the commissioning record, the manufacturer's warranty details and an explanation of the controls. Keep these for servicing, since many warranties expect an annual service.
Good to Know
Signs It Is Time to Replace Your Boiler
Repairing an old boiler repeatedly is often dearer than replacing it once.
Reasons to Replace Rather Than Repair
Any two or three of these point towards replacement.
- The boiler is more than ten to fifteen years old
- Repairs have been needed more than once in the last two years
- The heat exchanger has failed or is badly scaled
- Parts for your model are no longer easy to get
- Gas bills have crept up with no change in how you heat the home
What a Written Quote Should Include
Compare quotes on the same list.
- Boiler make, model and output in kilowatts
- Heating controls, such as a smart or programmable thermostat
- A magnetic filter and system cleansing to BS 7593
- Flue work, condensate routing and making good
- Warranty length and its servicing conditions
Why Us
Installation Across SW18 and SW15
Planned and emergency replacements, one number.
Emergency Swaps Handled
When a boiler fails beyond repair on a freezing night, the line is open and the partner company can talk through a replacement or a temporary solution on the next working day.
Terraces, Cupboards and Conservation Streets
Wandsworth has roughly 45 conservation areas, including Putney's West Putney and Putney Embankment, where visible changes to a front elevation deserve thought. The partner company flags flue positions early.
Your Name on the Text
Before anyone arrives we text you the partner company's name and details, and the partner quotes, invoices and takes payment directly. If anything goes wrong afterwards, you call us.
Not sure the boiler is past saving? Compare with emergency boiler repair first, and book boiler servicing to protect the new one. A replacement often goes with central heating repair, radiator repair & installation and hot water cylinder repair. We cover Putney, Southfields and Earlsfield. See all services.
What Is a Boiler Replacement?
A boiler replacement is the removal of an existing gas boiler and the installation of a new one, together with the flue, controls and system protection needed to run it safely. It may be like for like, such as a combi swapped for a combi in the same place, or a conversion, such as changing from a regular boiler with tanks to a combi or a system boiler with an unvented cylinder.
In England a new gas boiler must meet the efficiency and controls requirements of Building Regulations Part L, with a minimum seasonal efficiency of 92% for new boilers, and the work is notified to building control. Installation follows the manufacturer's instructions and the Gas Safety (Installation and Use) Regulations 1998, and the system is commissioned and cleansed before handover.
What Affects the Price of a New Boiler
Boiler Type and Output
Published London guides put a new combi installed at roughly £2,000 to £3,500, with system and regular boilers and bigger homes costing more. A higher output, a better brand and a longer warranty all raise the price, so compare quotes on the same specification.
What Else Is in the Job
A moved flue, new pipework, a cylinder, system cleansing and heating controls each add to the cost. A like-for-like swap in the same spot is the cheapest route, and the written quote should itemise everything.
Frequently Asked Questions
How much does a new boiler cost in Wandsworth?
Published London prices for a new combi boiler, installed, run from roughly £2,000 to £3,500 in 2026, with system and regular boilers and larger homes costing more. The final figure depends on the boiler's output, flue changes, extra pipework and the controls you choose. The partner company surveys your home and gives a written quote that covers everything, so you see the number before any work starts.
Should I choose a combi, system or regular boiler?
A combi suits flats and smaller homes with one bathroom, since it heats water on demand and needs no cylinder. A system boiler with an unvented cylinder suits homes with several bathrooms and good mains pressure. A regular boiler with tanks can suit some older houses with existing pipework. The partner company will recommend based on your hot-water use, the space and the mains supply.
What rules apply to a new boiler in England?
New gas boilers must meet Building Regulations Part L, which sets a minimum seasonal efficiency of 92%, and the Boiler Plus rules require a combi to have time and temperature controls plus an additional energy-saving measure. The installation also follows the manufacturer's instructions and the Gas Safety (Installation and Use) Regulations 1998. The partner company notifies building control as required, so ask for the paperwork.
How long does a boiler replacement take?
A like-for-like combi swap is typically a day, while a move to a new location, a system boiler with a cylinder or a job involving flue or pipework changes can take two to three days. The partner company estimates in the quote and tells you when the heating will be off. In an emergency, a temporary heater may bridge the gap.
Can the boiler stay where it is?
Usually yes, which keeps the cost down. Moving it means a new flue route, new pipes and making good, and the flue terminal must meet minimum distances from windows and boundaries. In a conservation area such as West Putney, a flue on a street-facing wall needs particular care, so the partner company checks before quoting.
Why is cleansing the old system important?
Old radiators and pipes hold black sludge and scale that can block a new boiler's heat exchanger. Cleansing to BS 7593, plus a magnetic filter and inhibitor, protects the new boiler, and many manufacturers expect it. In Wandsworth's hard-water areas, scale makes it even more important, so ask for it in the quote rather than treating it as an optional extra.
Do I need a new cylinder or tank?
Only if you change from a regular boiler to a combi, in which case the cylinder and tanks can usually be removed, or if you switch to an unvented cylinder for mains-pressure hot water. An unvented cylinder must be installed to Building Regulations Part G3 with its safety devices. See hot water cylinder repair for how those work.
What warranty will I get?
Manufacturers' warranties vary and often depend on the boiler being installed to their instructions and serviced annually. The partner company should give you the warranty details and registration information at handover. Ask what the guarantee covers and what it requires of you, and keep the commissioning record, because it is the proof if you ever need to claim.
Can you replace a boiler in an emergency?
Yes, but a replacement needs a survey and a boiler in stock, so it is not usually done on the same night. What we can do is arrange an emergency visit to make things safe, then a partner company to quote the replacement the next working day. If the heating is the problem, a temporary electric heater may bridge the gap.
What should I check before accepting a quote?
Ask what boiler make and model is being fitted, whether the price includes controls, a magnetic filter, system cleansing, flue work and making good, and what guarantee comes with it. Make sure the quote is in writing, and compare like for like. We never promise a price on the phone, because the partner company only knows after seeing the property.
Will I need to do anything to prepare the house for the installation?
Clear access to the old boiler and the route for pipes and the flue, move belongings away from the work area and make sure someone can be home to let the partner company in. You may lose heating and hot water for the working day, so plan for that. The partner company explains the preparation in the quote and tells you if anything else is needed.
Can a smart thermostat be fitted with the new boiler?
Yes. Under the Boiler Plus rules a new combi needs time and temperature controls plus an additional energy-saving measure, and a smart or weather-compensating control is a common way to meet that requirement. The partner company can fit a compatible control with the boiler and explain how to use it, so you get the saving rather than just the hardware.
