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Do the Rayburn central heating pipes need to be 22mm or is 15mm ok ?

On the diagram it shows the hot take off for the central heating as 22mm, my circuit is 15mm could this be the reason why the pump is sending the water out of the overflow / expansion ? Any help greatly appreciated.

cold n fedup
January 2011
RayburnD.I.Y, PlumbingCentral Pipes Hot
dough full check the speed seting on the pump, thry on a lower speed and see what happens.

erj
January 2011
i've hopefully answered on your previous question

brian
January 2011

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Rayburn Central Heating Pipes - 15mm or 22mm?