25 Oct 2017

There have been many improvements in home heating over the last few years and one of those improvements has been the introduction of the Condensing boiler. From combination boilers, Conventional boilers with a hot water tank and external oil boilers condensing boilers are now becoming more and more commonplace.

What this article aims to outline is what a condensing boiler is and how the system works.

What is a condensing boiler?

A condensing boiler is a boiler that collects any heat that would be lost through the flue, unlike older systems any excess heat that went through the flue would be lost which then reduces the overall efficiency of the system. Condensing boilers can now be found as both Conventional (with a hot water cylinder) and as combination systems whether they are internal boilers or external to the property.


How the system works?

The main difference between a condensing system compared to a non-condensing system is that the excess heat that would be lost through the flue is collected by the means of a heat exchanger inside the boiler, This takes that excess heat that is carried by a water vapour and condenses the vapour into a liquid called “Condensate”.

When the system condenses the water vapour it then can take that latent heat and feed it back into the system. Once this is then collected it will run through a plastic pipe to an existing waste drainage pipe in the property or through a new one to a nearby drain outside the property.

Through this process the efficiency of the condensing boiler is much greater than their non-condensing counterparts, in some cases condensing boilers can be as much as 10-12% more efficient*.

*Source: http://www.cibse.org/getmedia/9b39b035-6d7d-49db-8285-e0e96c1043c3/GIL074-Domestic-Condensing-Boilers.pdf.aspx

In terms of financial savings if you were to replace your old G-rated boiler for a new condensing boiler  and if you update the existing heating controls you could save as much as £310 a year on your heating bills just through the improved efficiency.*

*(Figures from the Energy Saving Trust, Also you can find a further breakdown here)


Condensing boilers are now becoming an industry standard with many different models being made and updated as time goes on to make them more efficient, from updated heat exchangers to more efficient fuel pumps.

Condensing boilers are safer than non-condensing boilers, as there is a much lower risk of anything being sucked into the boiler. What’s more, a condensing boiler is typically at least 25% more efficient than a non-condensing model.*

*(Source: http://www.which.co.uk/reviews/boilers/article/new-boiler-what-you-need-to-know-before-you-buy-a-new-boiler/what-is-a-condensing-boiler/)

To conform with building regulations, since 1 April 2007 oil-fired boilers must have a Sedbuk efficiency of 86% or more (unless an exception is allowed). In practice, only condensing oil-fired boilers can meet this efficiency requirement. Typically, a new condensing oil-fired boiler will have an efficiency of 92% to 93%, compared with 85% for a new non-condensing boiler and 60% to 70% for older systems.*

*(Source: http://www.which.co.uk/reviews/boilers/article/oil-boilers)


If you want to see if you can qualify for an updated heating system through the ECO Scheme please contact us via our Online Form or contact our office on 01792 446646.


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