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central heating & hot water always on together?

I can't have my hot water on without central heating as well. Is it motorised valve or thermostatic timer control?
steven hall, April 2010
lot more info required for this one, stats,zone valves,pump,pumps,combi........you get the picture

avs, April 2010
that don't tell us nothing about what system you have.

hi-spec plumbing & heating (essex), April 2010