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What are the different types of boiler?

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If you’re in the market for a new boiler, it can be confusing to know which type of boiler is right for your home. There are three main types of boiler available in the UK; combi boilers, conventional boilers and system boilers. This guide will take you through the pros and cons of each type and will help you to reach an informed decision.

Combi Boiler

What is a Combi Boiler

A combination, or combi boiler is the most common type of boiler in the UK. It is a single unit that provides all of the heating and hot water for the home on demand. Often, combi boilers are the most cost and energy efficient boilers for residential users.

Pros of Combi Boilers

  • Hot water and heating on demand

  • Lower risk of pipes freezing

  • Compact option for smaller homes and no need for a cold water tank in the loft

Cons of Combi Boilers

  • Lots of moving internal parts with more potential for faults and breakdowns

  • Most suitable for small households as hot water from a combi boiler system can only be used for one task at a time

  • Requires a good level of mains pressure, therefore may not be suitable for homes with low water pressure

Conventional Boilers (Heat-Only Boiler)

What is a Conventional Boiler?

Comprised of both a cylinder and water storage tank, a conventional, or heat-only boiler, is a great option for larger households that may need to use large volumes of hot water simultaneously. Water is heated and stored in a hot water cylinder ready for use. Cold water is usually stored in a separate tank. 

Pros of Conventional Boilers

  • Most suited to larger households where several occupants may need to use hot water at the same time

  • Suitable for homes with low water pressure

Cons of Conventional Boilers

  • Once the stored hot water runs out, you will need to wait for the tank to heat up again

  • Conventional boilers are somewhat less efficient than combi boilers as the hot water cylinder will gradually lose heat over time

  • Requires more space than combi boilers

System Boilers

What is a System Boiler?

A system boiler works similar to a conventional boiler, but with less external parts. They still require a hot water cylinder, but not a water tank. System Boilers are a perfect option for homeowners that want the benefits of a conventional boiler, but with the practicalities of a combi boiler.

Pros of System Boilers

  • Compact with many inbuilt components

  • Suitable for larger households that require a large volume of hot water at the same time

  • A good option for homes with low water pressure

Cons of System Boilers

  • Similar to a conventional boiler, system boilers are somewhat less efficient than combi boilers

  • Once the tank of hot water has run out, you will need to wait for it to heat up again before further use

  • The boiler may be more compact, but you will still need to find space for the cylinder

Made your decision and know which boiler suits your home best? Head over to our New Boilers page to learn more about how Home Assist can help. Get your fixed quote in under 60 seconds!

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