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Hmmm - seems as though for everyone who loves a combi, another person hates them. looking at the work required to replace cold water tanks in the loft, pipe them, replace a hot water cylinder, and put in a new boiler, this could come out very expensive. so, if looking to replace a combi - which one. there are so many to choose from. the which guide brings out worcester bosch as the best although they are pricey to repair. vaillant actually come out best from the point of view of heating engineers. but among those makes only there are dozens of boilers all with different specs and goodness knows where to go. the man who does our gas always, ex gas board fitter, personally had a worcester bosch and want impressed with it. he has an ideal logic+ and has suggested one of those, but in the which guide, ideal don't come out well at all. frankly it makes you want to go back to the old days of an immersion and coal fire!! you new where you were with those.