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sorry for ignorance but what is OP? as far as i know the link is in situ

yes the hot water works fine with the boost function

cheers for that i have wired that way but it won't allow me to control water on it's own. I can only set program with central heating and hot water. I can use the boost button to give 1 hour of hot water? any ideas? many thanks

time and control unit control unit existing wire in time clock

Can anyone tell me which wires i need to use for my new time clock it is a c27 centauraplus many thanks

is this a fully pumped system or gravity fed I am wanting to fit a new digital time clock to control heating and hot water many thanks

central heating