What are condensing boilers?

Condensing boilers are the most energy efficient Central Heating boilers on the market today. They achieve this high level of efficiency by removing the heat from the fuel it is burning and also cooling the products of combustion, which are normally wasted up the flue, so much so that the water vapour in them turns into liquid. This happens at around 55°C. For a boiler to cool the flue products this much, it has to have a larger, more efficient heat exchanger than traditional boilers.

So why aren't all manufactured boilers condensing?

Well, firstly, because the liquid water, the condensate, has to be safely removed from the boiler and to include this into the design requires the use of materials not normally used in traditional boilers.
Secondly, the natural buoyancy of the flues products is lost when the temperature is brought this low so it is necessary to have a fan to remove them.
Finally, larger heat exchangers cost more to make so the boilers will be higher in price and it takes very clever designs to ensure that the user will be able to save more in reduced fuel bills than they spend on the extra cost of Condensing Boiler.

There is also another benefit obtained by the water vapour turning into liquid, it gives up energy, which is called latent heat. This adds to the rest to make the overall efficiency of a condensing boiler maybe 15% greater than a modern non-condensing one. The more efficient the boiler is, the less fuel it uses, the less carbon dioxide it produces and the less it costs to run.

Greenstar 24Ri from

What are the advantages of a condensing conventional boiler?

Greenstar 24Ri

It's often said that you can't please everybody all of the time - but the advanced new series of Greenstar Ri condensing boilers from Worcester Bosch has so much to offer that it's already disproving such a notion.

Here is a groundbreaking range of energy-saving boilers which is very good news for the environment and excellent news for specifiers, developers, installers and consumers alike.

HE stands for Higher Efficiency. And for Highly Cost Effective

The Greenstar Ri condensing boilers have an average annual efficiency (SEDBUK value) of over 90%, efficiently producing heat for your heating and/or hot water system. Other types of boiler achieve around 78% efficiency. Therefore, compared with a new conventional boiler, a Greenstar Ri can cut heating and hot water bills and it's cheaper to run than an older boiler.

Hence Sedbuk Band A ratings for all models in the new Greenstar Ri condensing range.

To all these major benefits you can add yet more: superlative Worcester Bosch quality and reliability; a range of outputs to satisfy the heating demands of a range of household; and truly exceptional all-round value for money.

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