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Types of Boilers

House 4

Combi

Combi (or combination) boilers are the UK's most popular type of boiler for gas central heating and domestic hot water. They are easy to install, simple to use and economical to run.

A combi boiler only heats water when a hot tap or shower is turned on, ensuring maximum efficiency. There is no need to find space for a water storage cylinder or have a tank in the loft. Hot water is delivered to your taps at mains pressure, so you can enjoy a powerful shower without the need for a pump.

 

 

 

The benefits

  • Space saving solution.
  • No need for a hot water tank.
  • Heats up hot water when you need it.
  • Hot water with mains pressure.

Things to consider

  • If you have low mains water pressure in your home.
  • If you want the benefits of an airing cupboard for clothes drying or storage.
  • If you have multiple taps or showers using hot water at the same time, the flow to each will be reduced depending on how powerful your boiler is.

 


 

Heat only boiler

 

 

Heat Only

Heat only boilers are also known as 'regular' or 'conventional' boilers. If you are replacing an old boiler and have a small expansion tank and a larger cold water storage cistern in your loft space, you probably already have a heat only boiler. The system will usually comprise two tanks in the loft, a hot water storage cylinder in the airing cupboard and a separate pump.

 

 

 

The benefits

  • Faster flow rates than a combination boiler.
  • operation
  • Use of an airing cupboard.
  • Backup electrical hot water heating via immersion.
  • Heating and hot water together.
  • Solar compatible.

Things to Consider

  • You will need space for a large water tank in your loft.
  • It will take time for the water to heat up.
  • You'll have limited amount of hot water - as it takes time to re-fill and heat.

 


 

System boiler

System Boiler

A system boiler is similar to a regular boiler in that they both work on the principle of stored hot water.

However they differ in one important respect in that a system boiler does not require a feed and expansion tank. This frees up space in the loft and results in a cheaper and more efficient installation. A system boiler pumps hot water directly from the boiler around the radiator system and hot water tank, this results in faster response time and running costs. A system boiler tends to be larger than a regular boiler as it contains the expansion vessel, filling loop and pump however this does result in a more simple installation.

 

 

 

The benefits

  • Inexpensive to run
  • Reliable
  • Provides a faster response for hot water
  • Less tanks in loft reducing risks of leaks

Things to Consider

  • Physically takes up more space.
  • Usually more expensive to buy than regular boilers