Re: pipe size question
Cheers for that mate i sorted it today i up graded the pump to a twin impellor and boosted both hot and cold.
I put the pump infront of the cylinder in airing cupboard and it has its own seperate feeds both hot and cold this has worked fine. As for the noise it was just vibration which i sorted with some loft insulation taped to a piece a ply and placed under the pump.
I also changed the bath taps back to 22mm it has made a little difference but not much.
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