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Non-Condensing Gas Boiler Upgrade

We can offer a gas boiler upgrade if your current boiler is non-condensing and you own the property you currently live in, through the ECO4 scheme.

The new boiler will be a more efficient condensing Gas boiler.

Non-Condensing Boiler vs Condensing Gas Boilers

All new gas boiler installations must be condensing by law, which came into effect in 2005, however there are a small list of exceptions that can still allow a non-condensing boiler to be installed.

Only condensing boilers can be installed under the ECO4 scheme. There is no exceptions made under the scheme.

All well designed and maintained boilers burn their fuel efficiently, but non-condensing boilers inevitably lose heat in the form of hot gases that escape up the flue. This limits their overall efficiency. Non-condensing boilers may only have an efficiency rating of 70 to 80 per cent, while in old models this figure could be even lower at 50 to 60 per cent.


In contrast, condensing boilers have been designed to minimise this heat loss and have an average efficiency of 95% with some models able to achieve 99% efficiency.  


Condensing boilers feature larger heat exchangers that cool the flue gases before they escape, condensing the water vapour out of them. The temperature of the flue gases during this heat exchange process drops rapidly from approximately 130℃ to 50℃. The condensation formed as a result is what gives the boilers their name, and there can be as much as two litres of it produced every hour. This condensate liquid is drained into a waste water outlet via a condensate pipe.


Thanks to this additional heat exchange process, condensing boilers are able to extract virtually all of the heat latent in the flue gases. This additional heat energy is then transferred back into the heating system. 


The extra efficiency of condensing boilers means they can offer major cost savings and they are also more environmentally friendly, helping you to lower the carbon emissions of your household. 

Advantages of condensing gas boilers

  • More energy-efficient as they use more of the fuel for usable heat

  • Lower energy bills

  • Use less fuel than non-condensing boilers to produce same amount of heat and hot water

  • Reduced CO2 emissions and carbon footprint

How can I tell which type of boiler I have?

There are 2 easy ways to check if your boiler is either condensing or non-condensing and you do not have a manual to hand.

  1. If the boiler has a white plastic pipe coming out of the bottom of the boiler and then going outside into a drain, it is condensing. You will usually see the condensate pipe on the exterior wall to the boiler.

  2. If the flue is white plastic it is condensing. If it the flue is metal, then it is non-condensing.

To check if you are eligible under the ECO4 scheme, please click the button below and complete the online form. 

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