Condensing Boilers

Heating now accounts for around 60% of the average household’s annual energy bills, so it’s worth making your heating system as efficient as possible.

Replacing your old gas or oil boiler with an efficient condensing boiler can save you around £225 a year on your bills, and if you are using electric heating, switching to an oil or gas condensing boiler can save you around £500 a year.

See how much you can save!

The Basics

Condensing boilers are a newer, more efficient type of boiler. They are very similar to standard boilers, but have an additional heat exchanger. Boilers produce hot gases that escape through your boiler’s flue. The second heat exchanger reclaims heat from these hot gases, meaning that you have to use less fuel to heat your water, saving you carbon emissions and money.

Condensing boilers are as much as 12% more efficient than standard boilers, and from 2005, all boilers fitted in UK homes must be condensing boilers apart from in exceptional circumstances. From 2010, this was narrowed to include only boilers that are ‘A’ rated or 88% efficient on the SEDBUK scale. Regulations also state that you will have to have a time and temperature control fitted as part of the installation, to maximise the efficiency of your system.

There are two main types of Condensing Boiler:

  1. Combi (Combination) -  These don’t need a water tank as they heat the water ‘on demand’ when it is needed, such as when you turn the tap on. This means that you don’t need to wait for your water to heat and you can save the space of a hot water tank. They are more efficient than system boilers, but have lower capacities, so are generally used for smaller homes.
  2. System or Open Vent – These have a tank to store hot water and are better at providing water for larger homes with multiple bathrooms or showers, particularly if you might need to run them at the same time. You will get need an airing cupboard or another place where the hot water tank will be housed.

See which boiler is best for you!

FAQs

How often should I get my condensing boiler serviced?
It's important to have any gas or oil fired appliance like a condensing boiler serviced once a year. The flue will need checking to make sure it is clear, and a qualified installer should check that your boiler is running safely and efficiently for you. It's best to check with your manufacturer about service schedules, as some boilers may need servicing more than others.
How easy is it to install a condensing boiler?
Boilers vary in size and shape but most are designed for simplicity of installation. With space being such a premium many boilers are small enough to be fitted by one person into a kitchen cupboard, easily and with minimum disruption.
How can a condensing boiler save me money on my energy bills?
Condensing boilers are more efficient than standard boilers and therefore utilise less gas during operation. Modern conventional boilers can only offer a typical efficiency rate of 78%, whereas the rate for condensing boilers is around 88% - i.e. for every £1 spent spent on gas, 88p is converted to actual heat. This adds up to significant savings on annual gas bills, which will enable you to quickly recoup the initial outlay for the boiler and benefit from the extra savings. Complete our Home Energy Survey to find out just how long payback will take in your situation.
How is the Sedbuk rating calculated?
The 'seasonal efficiency of a domestic boiler in the UK' (Sedbuk) rating for boilers is calculated from the results of standard laboratory tests, together with other important factors such as boiler type and the kind of fuel used. It describes the boiler's efficiency.
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