New Boiler Installation in London — Fitted, Registered and Fully Warranted
Replacing an old unreliable boiler? We supply and install all major brands with manufacturer warranty
A new boiler is one of the most significant investments you’ll make in your home or rental property. When your existing boiler starts failing regularly, costs a fortune to run, or simply cannot be repaired cost-effectively, replacement is the right decision. 247 Plumber London supplies and installs all major boiler brands — Worcester Bosch, Vaillant, Ideal, Baxi, and Viessmann — with full manufacturer warranty, Gas Safe registration, and Building Regulations compliance. Our engineers assess your property’s requirements and recommend the right boiler type and output for your needs. Pricing is transparent and agreed upfront, and we handle everything from removing the old unit to registering the new boiler with the manufacturer. Call us today for straightforward advice and a reliable installation.
Signs You Need a New Boiler
Your Boiler Is Over 12 Years Old
Modern condensing boilers achieve efficiency ratings above 90%, meaning more than 90p in every £1 of gas is converted into heat. Older boilers often operate at 60-70% efficiency, wasting a significant portion of your fuel spend. If your boiler is over 12 years old, upgrading to a modern unit is likely to cut your heating bills substantially — and you’ll benefit from a fresh warranty and improved reliability.
It Keeps Breaking Down
An occasional boiler service call is normal. But if your engineer is visiting several times a year, or the same faults keep returning, you’re spending money on an appliance that has reached the end of its reliable working life. At some point, continued repair costs exceed the investment in a new unit — and a new boiler gives you peace of mind that an ageing system simply cannot provide.
Energy Bills Are Rising
If your heating bills have increased noticeably despite no change in usage habits, your boiler may be losing efficiency. As boilers age, components wear and the combustion process becomes less effective. A new A-rated condensing boiler paired with a smart thermostat can deliver meaningful savings every year — often paying back the installation cost over time.
Parts Are No Longer Available
Manufacturers typically support boiler models with spare parts for around 10 years after production ends. Once parts become unavailable, repairs become impossible regardless of cost. If your engineer can no longer source parts for your boiler, replacement is your only option.
Inconsistent Hot Water
If your hot water runs cold partway through a shower, or takes a long time to heat up, your boiler may be struggling to meet demand. This could indicate a heat exchanger fault, a failing diverter valve, or simply a unit that’s undersized for your current household’s needs. A new correctly sized boiler eliminates these problems.
Boiler Types We Install in London
Combi Boiler (Most Popular)
A combi (combination) boiler heats water directly from the mains on demand — no hot water cylinder or cold water tank needed. They’re compact, efficient, and ideal for flats and smaller London properties where space is at a premium. Hot water is available instantly without waiting for a tank to heat up.
System Boiler
A system boiler heats water and stores it in a separate hot water cylinder, making it suitable for larger properties with multiple bathrooms where simultaneous hot water demand is high. The cylinder is heated quickly and keeps water at temperature, ensuring strong flow rates even with several taps or showers running at once.
Heat-Only (Regular) Boiler
Also known as a conventional boiler, a heat-only system requires both a hot water cylinder and a cold water tank in the loft. It’s often the best choice when replacing a like-for-like system in an older property where the existing pipework is designed around this configuration.
Brands We Install
We supply and install Worcester Bosch, Vaillant, Ideal, Baxi, and Viessmann — all leading manufacturers with strong warranty terms and readily available parts. Our engineers are trained on all these brands and can advise which is best suited to your property and budget.
How We Handle Boiler Installation in London
- Survey and recommendation: We assess your property, existing system, and requirements, then recommend the right boiler type and model.
- Upfront quotation: You receive a clear written quote covering supply, installation, and any associated work before you commit.
- Removal of the old boiler: We safely decommission and remove your existing boiler and dispose of it responsibly.
- Installation: The new boiler is fitted, connected, and commissioned by our Gas Safe engineers to manufacturer specification.
- Building Regulations notification: We register the installation with the relevant authority, ensuring you have all necessary compliance documentation.
- Manufacturer registration and handover: Your warranty is registered, and we walk you through operating your new boiler and controls.
Boiler Installation Across London
We install boilers throughout London, covering Westminster, Camden, Islington, Hackney, Tower Hamlets, Southwark, Lambeth, Wandsworth, Greenwich, Lewisham, Bromley, Croydon, Sutton, Merton, Kingston upon Thames, Richmond, Hounslow, Ealing, Brent, Harrow, Barnet, Enfield, Haringey, Waltham Forest, Newham, Redbridge, Barking, Havering, Kensington, Fulham, Clapham, Brixton, and Peckham. Wherever you are in the capital, we’ll get to you.
Why London Customers Choose Us
- Gas Safe registered engineers (ask to see the card on arrival)
- Upfront pricing — agreed before we start, no hidden extras
- Competitive Rates
- Fully insured and DBS checked
- 24/7 service including bank holidays
Frequently Asked Questions
How long does a boiler installation take?
A straightforward like-for-like replacement typically takes one day. More complex installations involving system changes, new pipework, or repositioning the boiler may take two days. We’ll give you a realistic timeline when we survey the job.
How do I know which size boiler I need?
Boiler output is measured in kilowatts (kW). Our engineers calculate the right output based on your property’s size, number of radiators, hot water demand, and insulation levels. An oversized boiler wastes energy; an undersized one can’t meet demand — getting this right is important.
What’s the difference between a combi, system, and regular boiler?
A combi heats water on demand with no storage tank — compact and efficient. A system boiler stores hot water in a cylinder for higher simultaneous demand. A regular (heat-only) boiler works with both a cylinder and a cold water tank, and suits older properties with existing conventional systems.
Do you remove the old boiler?
Yes. We decommission and remove your old boiler as part of the installation service. Disposal is handled responsibly — we do not leave you to arrange this yourself.
Do I need Building Regulations approval?
Yes, boiler installations must comply with Building Regulations (Part L). As Gas Safe registered contractors, we self-certify the work and provide you with a completion certificate, which is important for property sales and insurance purposes.
Which brands do you install?
We install Worcester Bosch, Vaillant, Ideal, Baxi, and Viessmann. All are high-quality manufacturers with strong warranty terms. Our engineers can advise on which brand and model best suits your needs and budget.
What warranty comes with a new boiler?
Warranty terms vary by manufacturer and model — typically between 2 and 10 years depending on the brand and whether you register the boiler. We handle registration for you and ensure you understand what your warranty covers.
Do I need to be home during installation?
Yes, someone needs to be present throughout the installation. We’ll agree a start time with you and aim to complete the work within the stated timeframe to minimise disruption.
What affects the cost of a boiler installation?
The main factors are the type and model of boiler chosen, the complexity of the installation, any additional pipework or system changes required, and whether flue repositioning is needed. We provide a detailed quote so you know exactly what you’re paying for.
How often should I service my new boiler?
Annual servicing is recommended — and required by most manufacturers to maintain the warranty. A service checks combustion efficiency, safety devices, and component condition, and picks up minor issues before they become costly failures.
Ready for a New Boiler in London?
Available 24/7 across all of London
Email: info@247plumberlondon.co.uk