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Condensing boilers are highly efficient boilers that have much lower fuel and running costs than conventional boilers.
Condensing boilers offer tangible benefits by:
They work on the principle of recovering as much as possible of the waste heat which is normally rejected to the atmosphere from the flue of a conventional (noncondensing) boiler.
This is accomplished by using an extra-large heat exchanger or sometimes two heat exchangers within the boiler which maximises heat transfer from the burner as well as recovering useful heat which would normally be lost with the flue gases.
When in condensing mode (as condensing boilers do not condense all the time) the flue gases give up their 'latent heat' which is recovered by the heat exchanger within the boiler and used to preheat the return water, as illustrated in the diagram. As a result the temperature of the gases leaving the flue of a condensing boiler is typically 50-60 DC compared with 120-180D C in a current non-condensing boiler. At the same time an amount of water or 'condensate' is produced.
A condensing boiler will always have a better operating efficiency than a conventional non-condensing one, due to its larger and more efficient heat exchanger.
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