"Vaci" wrote in message
oups.com...
Well, there is space for a small header tank, but I don't really want
to add another component to my system.

The flow from the roof tank is actually quite good as the pipework is
oversized. I guess if a pump isn't feasible then I will just use 22mm
pipework all the way to the shower mixer. I don't want to fork out for
a high pressure pump and mixer block before I find out I can't use it!


Put a pump on with a non return valve on your cold supply from the communal
header tank.

What do you have now? Do you have a conventional open vented cylinder? Is
the open vent running to up and over the header tank?


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