System boilers are ideal for larger properties with a high hot water need


System boilers are a popular type of boiler for larger homes, although they’re usually less efficient than combi boilers. With a system boiler, you’ll need a hot water cylinder.

Like a combi boiler, system boilers take their water supply directly from a mains feed. However, they heat water into a hot water tank as well as into your central heating system. This may mean that they’re less efficient, as you’ll have to heat an entire tank of hot water regardless of how much you use.

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Is a system boiler the best boiler for you?

If your home is particularly large, for example if you have more than 2 bathrooms, a system boiler could be the best choice for you. New high efficiency models are efficient and quiet, although combi boilers are generally more efficient.

If you don’t have the space for a hot water tank, you’ll want to choose a more compact type of boiler instead of a system boiler. If you already have a system boiler, replacing it with another system may be easier, as you’ll already have the required hot water tank.

It’s also worth bearing in mind that with a system boiler, hot water isn’t instant. If you’ve used all of the hot water in the tank, you’ll need to wait until it can be refilled.

Struggling to find the right boiler for your home? Use our simple online service to recommend boilers suited to your property.

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Every Smart Heating boiler comes with
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Ideal Logic Plus System 18

Logic Plus System 18 24 30

Fully Installed Price

  £2,230 inc. VAT
from £11.94 per month
  • Efficiency rating:
  • 10 year warranty
  • Central heating output: 18kW
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Tell us about your home to find out if this boiler’s right for you

These show this boiler’s ErP efficiency rating for space heating and hot water from A+++ - G. You could save hundreds on your heating bills by replacing your old boiler with an A-rated one.

Old BoilerAnnual Saving

Source: Energy Saving Trust


We offer a range of different system boiler brands. Explore all of your options for system boilers here.

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