Boiler Installation & Replacement London
New A-rated boiler installation and full boiler replacement across all London boroughs. Worcester Bosch, Vaillant, Baxi, Ideal and more — installed by Gas Safe registered engineers with a full workmanship guarantee.
Which Boiler Is Right for Your Home?
Our engineers will help you choose the right boiler type and brand for your property, hot water demand and budget.
Combi Boiler
Best for: Smaller homes, 1–2 bathrooms
Heats water on demand directly from the mains. No hot water cylinder or cold water tank needed. The most popular choice for London flats and smaller homes — compact, efficient and cost-effective.
- Space-saving — no cylinder needed
- Instant hot water on demand
- Lower installation cost
- Easy to maintain
System Boiler
Best for: Larger homes, 2+ bathrooms
Works with a hot water cylinder to store hot water. Ideal for homes with higher hot water demand — multiple bathrooms can be used simultaneously without losing pressure.
- Multiple bathrooms at once
- Good hot water pressure
- Compatible with solar thermal
- Suitable for larger families
Regular (Heat Only)
Best for: Older homes, existing systems
Traditional boiler that works with both a hot water cylinder and a cold water tank in the loft. Best for replacing an existing regular boiler where the pipework is already in place.
- Suits older pipe systems
- Good for high demand properties
- Compatible with gravity systems
- Often lowest replacement cost
All Major Boiler Brands
Expert Boiler Installation You Can Trust
- Free survey and no-obligation quote before commitment
- Gas Safe registered engineers — legally certified for all gas work
- All major brands stocked and installed
- Manufacturer warranty registered on your behalf
- Full workmanship guarantee on all installations
- Property fully protected — dust sheets, shoe covers
- Old boiler removed and disposed of responsibly
- System flushed and balanced on completion
Boiler Installation Questions Answered
How long does a new boiler installation take?+
A straightforward like-for-like boiler replacement typically takes one day — usually 4–8 hours. More complex installations, such as converting from a regular boiler to a combi boiler or relocating the boiler, may take 1–2 days. We will always give you an accurate timeframe before work begins.
Which boiler brand do you recommend?+
We work with all major brands including Worcester Bosch, Vaillant, Baxi, Ideal, Glow-worm and Viessmann. Worcester Bosch and Vaillant are particularly popular for their reliability and efficiency. Our engineer will recommend the most suitable boiler for your home size, hot water demand and budget — without pushing any particular brand.
What is the difference between a combi boiler and a system boiler?+
A combi boiler heats water on demand directly from the mains — it does not need a hot water cylinder or cold water tank, making it ideal for smaller homes with one or two bathrooms. A system boiler works with a hot water cylinder and is better suited to larger homes with higher hot water demand or multiple bathrooms. Our engineer will help you choose the right type for your property.
Do you offer a guarantee on new boiler installations?+
Yes. All our installations come with a full workmanship guarantee. Additionally, most new boilers include a manufacturer warranty — Worcester Bosch and Vaillant typically offer 5–10 year warranties when installed by an accredited engineer. We will confirm the exact warranty terms at the time of your installation.
Should I repair or replace my old boiler?+
As a rough guide, if your boiler is under 10 years old and the repair cost is less than half the price of a new boiler, repair is usually the better option. If it is over 15 years old, requires repeated expensive repairs, or is an older G-rated boiler, replacement with a modern A-rated boiler will save you money on energy bills in the long run. We will give you an honest assessment with no pressure.
How much can I save with a new energy-efficient boiler?+
Replacing an old G-rated boiler (around 70% efficient) with a modern A-rated condensing boiler (90%+ efficient) can save a typical London household £200–£400 per year on heating bills, according to the Energy Saving Trust. The exact saving depends on your home size, usage patterns and current boiler efficiency.
Ready for a New Boiler?
Get a free no-obligation quote. Most installations completed within one day.
Gas Safe Registered · All Major Brands · Full Workmanship Guarantee