Plumbing · Croydon, London
Boiler Installation & Replacement in Croydon
A new boiler should be chosen after someone has looked at the house, not before. [Proper Plumber Croydon](/) answers on 07898 116196 at any hour and arranges boiler installation and replacement through independently owned local partner companies, who survey the property, size the boiler to the home and put the whole job in a written quote.
The published London range for a new gas combi, supplied and fitted, sits at about £2,000 to £3,600 like for like, with a premium or awkward job reaching around £4,500. Where a job lands inside that spread depends on the boiler's output, whether the flue stays where it is, how much pipework changes and which controls go on the wall. None of that can be read off a postcode, which is why the number comes after the survey.
Croydon water makes the choice of boiler less simple than the brochure suggests. Thames Water's Croydon East supply measured 308 mg/l as calcium carbonate in 2025, which is very hard, and a combi's compact heat exchanger is the first part to fur up. A good installation allows for that with a filter, system cleansing to BS 7593 and a service plan, because the cheapest boiler on paper is not the cheapest one by year eight.
The homes matter too. Around Addiscombe and Woodside the streets are mostly Victorian terraces, where the boiler is often in a rear kitchen with a short run to an outside wall. In Shirley the 1930s semis tend to have an airing-cupboard cylinder or loft tank that a conversion to a combi could remove. Both are quick to assess on a visit and easy to get wrong on the phone.
If your current boiler is still working, now is the cheapest moment to ask. A planned replacement can be priced, scheduled and compared; an emergency one is limited by whatever is in stock and in the diary that week.
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What We Do
Choosing the Right Boiler for a Croydon Home
Size, space and hot-water habits decide the boiler, and the survey is where those are measured.
Combi Boilers for Terraces and Flats
A combi gives hot water on demand with no cylinder, which frees an airing cupboard in a Victorian terrace or a flat near East Croydon. It suits one bathroom and healthy mains pressure. Two showers at once will stretch it, and in very hard water the heat exchanger wants a filter and a regular service.
System Boilers With an Unvented Cylinder
Bigger houses, such as the detached homes of Upper Shirley with two or three bathrooms, usually do better with a system boiler feeding an unvented cylinder, which delivers mains-pressure hot water to several outlets together. That cylinder is installed to Building Regulations Part G3 with its safety devices and a proper discharge route.
Flue, Condensate and Controls
The flue route, the condensate run and the controls are where a tidy installation is separated from a rushed one. A condensing boiler needs a drain for acidic condensate, a flue terminal clear of windows and boundaries, and controls that meet Part L. Leaving the boiler where it is keeps all three simple.
The Benefits
What a Properly Run Replacement Looks Like
Each stage has a purpose, and you should be able to ask what it is and get a straight answer.
Survey Before Price
The partner company checks the existing boiler position, flue route, pipework and radiators, and asks how you use hot water. Only then does a written quote arrive, listing the boiler by make and model, the controls, the filter and the making good.
Fitted to the Rules
The old boiler comes off and the new one goes on to the manufacturer's instructions, Building Regulations Part L and the Gas Safety (Installation and Use) Regulations 1998. The system is flushed, protected and commissioned before it is handed back to you.
Paperwork You Can Use
You should finish with the commissioning record, the warranty terms and a walk-through of the controls. Many manufacturers expect an annual service to keep the warranty valid, so ask what the conditions are before you sign.
Good to Know
Replace or Repair? How to Tell
A boiler that keeps breaking costs more than one that is replaced once.
Signs Replacement Is the Better Spend
Two or three of these usually settle it.
- The boiler is past ten to fifteen years old
- A circuit board or heat exchanger has failed
- It has needed repair more than once recently
- Spare parts for the model are hard to find
- Bills have climbed with no change in how you heat
What to Expect in a Written Quote
Compare quotes line by line.
- Boiler make, model and output in kilowatts
- Controls such as a smart or programmable thermostat
- Magnetic filter and cleansing to BS 7593
- Flue work, condensate route and making good
- Warranty length and its servicing conditions
Why Us
Replacing a Boiler Across CR0 and SE25
One number for a planned swap or a failed boiler in January.
A Quote That Names the Boiler
A proper quote says which boiler, what output and what warranty, so two quotes can be set side by side. When the partner company's price arrives in writing, you decide at your own pace, with no pressure from us.
Streets With Rules of Their Own
The East India Estate Conservation Area, designated in March 2008 around Canning Road and Havelock Road, adds planning control on external changes such as flue terminals. The partner company raises that before the quote, not after the scaffold goes up.
The Name Arrives by Text
Before anyone comes to the door we text you the partner company's name. They quote, do the work, invoice and take payment themselves, and if anything is wrong afterwards you ring this number and we chase it.
Unsure whether the old boiler is worth saving? Read about emergency boiler repair first, and see how central heating repair can clear sludge before a new boiler goes in. A change to unvented hot water often goes with hot water cylinder repair, and a refit can sit alongside bathroom installation. We work across Addiscombe, South Norwood and Shirley. See all services.
What Counts as a Boiler Replacement?
A boiler replacement is the removal of an existing gas boiler and the fitting of a new one, with the flue, controls and system protection needed to run it safely. It may be like for like, a combi swapped for a combi on the same wall, or a conversion, such as a regular boiler with tanks replaced by a combi.
New gas boilers in England must meet Part L of the Building Regulations. Installation follows the manufacturer's instructions and the Gas Safety (Installation and Use) Regulations 1998, and the system is commissioned before handover. Croydon Council's building control team is the local authority that receives the notification.
What Moves the Price of a New Boiler
Output, Make and Warranty
A higher output, a better-known make and a longer warranty all raise the price. Compare quotes on the same specification, because two quotes that look £500 apart often cover different boilers.
Everything Around the Boiler
A moved flue, new pipework, a cylinder, system cleansing and heating controls each add to the total. A like-for-like swap in the same position is the cheapest route, and the written quote should itemise each part.
Choosing Between Quotes
Spec, Not Just Price
Two quotes can differ by hundreds of pounds because one includes cleansing, a filter and smart controls and the other does not. Ask each company to list the same items, and the real gap becomes clear.
Timing the Work
Autumn diaries fill fast. A replacement booked in spring or summer is easier to schedule and leaves time to compare, and the heating comes back before the first cold week arrives.
Frequently Asked Questions
How much does a new boiler cost in Croydon?
Published London guides put a supplied-and-fitted gas combi at about £2,000 to £3,600 like for like, with premium or complex jobs reaching around £4,500. Your figure depends on output, flue changes, pipework and the controls chosen. The partner company surveys the house and gives a written quote, so you see the real number before any work begins.
Which boiler suits a Victorian terrace in Addiscombe?
Most terraces have one bathroom and limited space, so a combi is the usual answer because it needs no cylinder or tank. It works best when mains pressure is good and the household is not running two showers together. The partner company checks pressure and flow on the visit, so the recommendation rests on a measurement rather than a guess.
Does very hard water affect which boiler I should buy?
Yes, it affects how you protect it more than which one you pick. Croydon East water measured 308 mg/l as calcium carbonate in 2025, and scale shortens the life of a combi's heat exchanger. Ask for a magnetic filter, system cleansing to BS 7593 and a service plan in the quote, and consider whether a scale inhibitor suits your home.
What rules apply to a new boiler in England?
A new gas boiler must meet Building Regulations Part L, with a minimum seasonal efficiency of 92%, and under the Boiler Plus rules a combi needs time and temperature controls plus a further energy-saving measure. The fitting follows the manufacturer's instructions and the Gas Safety (Installation and Use) Regulations 1998. The work is notified to building control, and you should be given the paperwork.
Can the boiler stay where it is?
Usually yes, and that keeps the price down. Moving it means a new flue route, new pipework and making good, and the terminal must sit clear of windows and boundaries. In the East India Estate Conservation Area around Canning Road, a flue on a street-facing wall needs extra thought, so the partner company checks before quoting.
How long does a replacement take?
A like-for-like combi swap is generally a single working day. Moving the boiler, adding an unvented cylinder or changing the flue can stretch it to two or three days. The quote states the expected duration and when heating and hot water will be off, so you can plan around it. Ask what happens if the job overruns, so you know whether a temporary heater will be provided.
Do I need to flush the old radiators and pipes?
Almost always. Old circuits hold sludge and scale that can block a new boiler's heat exchanger, and manufacturers commonly expect cleansing and a filter as a condition of the warranty. System cleansing to BS 7593 is the standard to ask for. Treat it as part of the installation, not an optional extra. It adds to the price, but it protects a boiler that costs thousands of pounds, so it is money well spent.
Should I convert from a tank system to a combi?
It can work well in a 1930s Shirley semi where the loft tanks and cylinder take up room, but only if the house has one bathroom and good mains flow. A home with several bathrooms is often better served by a system boiler and unvented cylinder. The partner company explains the trade-off before quoting, and an unvented cylinder is fitted to Part G3.
What warranty will I get?
Manufacturer warranties vary in length and usually depend on correct installation and an annual service. The partner company should give you the warranty details and registration information at handover. Keep the commissioning record safely, because it is your evidence if a claim is ever needed. A longer guarantee that requires yearly servicing is only a bargain if you actually book the service each year.
Can a boiler be replaced in an emergency?
A replacement needs a survey and a boiler in stock, so it is rarely a same-night job. What we can do is arrange an out-of-hours visit to make the system safe, then pass the replacement to a partner company to survey and quote. If the problem is a fault rather than a failure, the emergency boiler repair page explains what a repair involves first.
What should I check before accepting a quote?
Look for the boiler make and model, the output, whether controls, filter, cleansing, flue work and making good are included, and the warranty terms. Make sure it is in writing and compare like with like. We never quote a price over the phone, because only a visit tells the partner company what the job really involves.
How do I prepare the house for the installation?
Clear access to the old boiler and the route for pipework and flue, move belongings out of the work area and make sure someone can let the partner company in. Expect no heating or hot water for the working day. The partner company confirms any other preparation in the quote. If you have pets or small children, tell the partner company so the work area can be kept safe.
