Combi Boilers
Combi Boilers in London
Compact, efficient heating from £1,690
The UK's most popular boiler type — perfect for flats and smaller homes.
Combi (combination) boilers provide hot water and heating from a single compact unit, with no need for a separate water tank. Ninja Boilers installs A-rated combi boilers across London from Worcester Bosch, Vaillant, Ideal and more — backed by 0% finance.
Free, No-Obligation Quote
Get a Free Quote
Tell us about your boiler — we'll come back with a fixed quote.
Benefits
Why combi boilers are the UK's most popular choice
Combi boilers heat water on demand, so there's no waiting for a tank to fill and no energy wasted keeping stored water hot.
Hot Water on Demand
Endless hot water heated directly from the mains — no cylinder, no waiting.
Space-Saving Design
A single compact unit fits neatly in a kitchen cupboard — no loft tank or cylinder needed.
Energy Efficient
Modern A-rated combis recover wasted heat and can significantly reduce gas bills.
Is a combi right for you?
Best for flats and small-to-medium homes
Combi boilers are ideal for small to medium-sized homes with one bathroom. Because they heat water on demand, performance can drop if multiple showers or taps run simultaneously — in which case a system boiler may suit you better.
- Pro: No tank or cylinder — saves space
- Pro: Strong mains-pressure hot water
- Pro: Energy-efficient and quick to install
- Con: Performance drops when multiple outlets run at once
- Con: Reliant on good mains water pressure
Popular models
Top combi boilers we install
- Worcester Bosch Greenstar 4000 / 8000 Combi
- Vaillant ecoTEC Plus Combi
- Ideal Logic+ Combi
- Baxi 800 Combi
- Viessmann Vitodens 050-W / 100-W Combi
- Alpha E-Tec Combi
Our Process
A simple, hassle-free journey
- 01
You Answer
Quick questions about your home and hot water needs.
- 02
You Pick
Choose a fixed-price combi boiler recommended for your property.
- 03
We Survey
A Gas Safe engineer confirms the install plan and books a slot.
- 04
We Fit
Your new combi is installed in as little as 24 hours.
- 05
Aftercare
Smart control setup, demo and ongoing servicing options.
Why Choose Us
Why London homeowners choose Ninja Boilers
Gas Safe registered engineers
Upfront, fixed-price quotes
0% interest finance over 12 months
Installation in as little as 24 hours
Up to 10-year manufacturer warranties
Family-run, local and trusted
FAQs
Frequently asked questions
Get a new combi boiler in London
Compact, efficient and installed in as little as 24 hours. Call 020 3576 5825.