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Originally Posted by derekgas

£2500 is nearer the cost for a 35cdi which condenses in hot water as well as heating mode, or for conversion from regular boiler (with tanks) to a combi, regular combis are around 75% efficient, condensing combis are around 90% efficient, the best I have had is 96% efficiency with it going flat out, an average is more like 90.3, the difference in different machines is negligable with condensing boilers, but quality and reliability is a different matter.

I will go along with that, but my point was are combi boilers energy efficient, what about the cold water draw off before you get hot water, more so on "longish" pipework runs, is that not a waste of water?

What are your thoughts on the companies that advertise on Ebay and still sell conventional combi boilers that you as a corgi reg contractor could not install because they do not comply.