Combi, system, conventional and electric boilers lined up for comparison

Boiler Comparison

Choose the right boiler for your space

Whether you're in a compact flat or a large family home, Ninja Boilers helps you find the perfect match. Compare combi, system, conventional and electric boilers — all installed with flexible finance and expert care.

Speak to our team and discover the best boiler for your home — with 12-month 0% finance on all installations.

Pros & Cons at a glance

Compare every boiler type, visually

A quick visual reference for the main strengths and trade-offs of each boiler type — perfect for narrowing down your shortlist before booking a survey.

Combi boiler pros and cons comparison chart
Combi boilers pros and cons
System boiler pros and cons comparison chart
System boilers pros and cons
Conventional / standard boiler pros and cons comparison chart
Conventional boilers pros and cons
Electric boiler pros and cons comparison chart
Electric boilers pros and cons

Compare and choose wisely

Four boiler types — side by side

Combi Boilers

Best for: Flats & smaller homes

Combi (combination) boilers are ideal for small to medium-sized homes. They provide hot water and heating from a single compact unit, with no need for a separate water tank. Combi boilers heat water on demand, making them energy-efficient and space-saving. They may not suit homes with multiple bathrooms in simultaneous use.

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System Boilers

Best for: Larger homes, 2+ bathrooms

System boilers are designed for homes with higher hot water demand. They work alongside a separate hot water cylinder but don't require a cold water tank in the loft. This setup ensures a steady supply of hot water to multiple taps at once — a popular choice for larger households or properties with multiple bathrooms.

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Electric Boilers

Best for: Off-gas properties

Electric boilers are an efficient choice for homes without a gas supply. Quiet, compact and easy to install, they're ideal for small properties, apartments and flats. They produce no carbon emissions at the point of use and require less maintenance. Running costs can be higher than gas.

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Conventional Boilers

Best for: Traditional / older homes

Also known as regular or heat-only boilers, conventional systems are perfect for homes with traditional heating setups. They use both a hot water cylinder and a cold water storage tank — typically in the loft. They take up more space but provide reliable flow and work well with older radiator systems.

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Need help choosing?

From cold to comfortable in 24 hours

Get a brand-new, A-rated boiler installed quickly and affordably with our 12-month 0% interest finance. No deposit required. Fixed prices. Trusted engineers.

24h
Typical install
0%
Interest finance
£0
Deposit required
10yr
Warranty

FAQs

Understanding boiler types and installation

Still have a question? Call 020 3576 5825

Find the perfect boiler for your London home

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