In article ,
Doctor Drivel wrote:
Why not take the cold feed from the cold header tank - rather than
from the mains - and then use a dual-channel boost pump, triggered by
a flow switch? That's what I do - with plenty of flow, and good
temperature control because hot and cold water pressures are equal.

Until leaks or fails and all the nosie they make. A good pump is NOT
cheap.

Nor is your idea of replacing all the pipework with larger. Plantpot.

--
*What hair colour do they put on the driver's license of a bald man? *

Dave Plowman London SW
To e-mail, change noise into sound.