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I have a Vaillant TurboMax Combination Boiler and it is doing the following... 1... Central Heating is fine on it's own. 2... Hot Water is fine when heating is off. 3... When I have the heating on and turn on a hot tap the water only comes out luke warm. Any Ideas ?

I have just had a new COMBI boiler fitted (Worcester Greenstar 35 CDi) which I am very,very impressed with it is soooo very quiet and the heating comes to life very quickly. I do have a small concern and that is that the hot water pressure is not as good as when I had a cylinder type system...