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Why can't I get hot water in my kitchen?

I have a Vaillant combi boiler. The bath water (downstairs bathroom) gets hot, but I have to turn the bath water on to enable the bathroom sink, and downstairs kitchen sink to get hot. What is the problem?
Di, August 2009
dhw diaphragm

hi-spec plumbing & heating (essex), August 2009
link Click here to see other fixes for Vaillant.