Now thats the reason i asked what existing controls.
You will need either an S plan pack or a Y plan pack .
That will include roomstat, cylinder stat and a programmer so HW and CH can be on seperatley or together,
They come with appropriate wiring diagrams
You will also need the boiler wiring instructions as it has to have a switched live and a permenant live as it has a pump over run on it.
And if the boiler has previously replaced an old servowarm system (they used manual valves) the pipework may need altered and pump moving etc
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