In article om,
Dave Liquorice wrote:
I'll ask again - more in hope than anticipation. Where does one buy the
type of mixer tap the OP has for a combined low pressure hot, high
pressure cold, supply?

Just bought a bath filler and basin filler from Boundary Bathrooms. Dual
control, 1/4 turn ceramic disc, monoblock, twin flow, suitable for low
and pressure systems. The key words are "twin flow" rather than "mixer".

Bath units tend not to be so difficult as many are available with 22mm
fittings.

On the OPs problem it may well be related to his fancy tap. It could
well be designed for high pressure systems only and thus will perform
badly on a normal UK HW tank fed (low pressure) HW system.

Snag is he obviously wanted the design he bought - as I did. Although
there was nothing in the instructions about it being high pressure only.
So the obvious answer is a pump - which ups the total cost, but does the
job. And much more cheaply than converting to a high pressure hot water
system - if you already have a decent storage one.

--
*Never underestimate the power of stupid people in large groups.

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