System Boilers
Uses a hot water cylinder — better for higher demand households
Pros
- Copes well with higher simultaneous hot water demand
- No loft tank required, unlike a regular boiler
Cons
- Needs space for a hot water cylinder
- Hot water supply is limited once the cylinder empties, until it reheats
About System Boilers
A system boiler works with a separate hot water cylinder (usually unvented, so no loft tank is needed) that stores heated water ready to use. This makes it better suited to homes with higher simultaneous hot water demand than a combi, at the cost of needing space for the cylinder.
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Frequently asked questions
Do I need a bigger cylinder for a bigger house?
Generally yes — cylinder size should be sized to your household’s peak hot water usage, which a qualified installer will calculate as part of a proper installation quote.
Are you a boiler installer yourselves?
No — Best Boiler Deals is an independent comparison and information service. We recommend always checking an installer’s Gas Safe Register ID directly before any gas work begins.
Is all the pricing on this site guaranteed?
No — costs mentioned are typical ranges reported by trade sources, not fixed quotes. Always get itemised quotes from more than one Gas Safe registered installer before committing.
What happens after I request a quote?
We look for a heating engineer who covers your area to arrange a proper site survey — there’s no obligation to proceed with any quote.
Request a boiler quote
Free and no obligation. Tell us what you need and where, and we will look for a heating engineer who covers your area.