What is a condensing boiler?

In a nutshell condensing boilers are more efficient than non condensing boilers, they have increased outputs and they can save you money!

Every gas and oil boiler installed in Ireland's must be a condensing boiler by law regardless of whether it is a combi, regular or system boiler.

Condensing boiler work by condensing water vapour in exhaust gases which recover latent heat that would otherwise have been wasted or vapourised through the flue.

Condensing boilers are also known as high efficiency boilers and achieve in excess of 90% efficiency. This means that for every €100 you spend on your heating bill, less than 10% will be lost and €90 will go toward heating your home!

If your boiler is older than 10 years old it could be operating at as low as 60% efficiency, meaning that for every €100 you spend on €40 could be wasted.

Condensing boilers have essentially become the industry standard for all boiler installations & replacements.


Similar to traditional heating systems a condensing boiler burns gas to heat water, producing a combination of carbon dioxide and water vapour. In contrast to traditional heating system, condensing boilers have a much larger heat exchanger which essentially recycles the heat in flu gases which would otherwise be lost through the flue.

What do condensing boilers mean for me?

There are 3 main benefits which condensing boilers provide homeowners.

  • Your home will be more energy efficiency

If your boiler is older than 10 years old it could be operating at as low as 60% efficiency. By simply upgrading your boiler you could increase your energy efficiency by 30%

  • You will save money

According to the Sustainable Energy Authority of Ireland's homeowners can save up to 20% on their energy bills by upgrading to high efficiency condensing boiler & controls.

  • You will reduce your carbon footprint  

Do your bit for the environment, condensing boilers generate fewer carbon emissions than traditional systems.

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