"Christian McArdle" wrote in message
. net...
If you are drawing 8 l/min and then taps are turned on to ramp up to 14
l/min, then the pressure in the hot line will drop. The balancing valve
will
drop the cold inlet to the mixer to the same as the hot, preventing
excessive cold being drawn off through the mixer, keeping the
temperature
stable.

You clearly live in a doll's house.

You clearly know nothing of this subject. We shall continue....

When I turn on a tap, I get 30 l/min.
This would lead to a drop in temperature.

You have a heat bank with a thermostatic blending valve controlling DHW
temperature, not a combi.

Furthermore, the combi is likely
to be set to 60C output to allow dishwashing.
Therefore, even on quite moderate hot water
flow rates, you'll be in the temperature unstable range.

What are you on about? Oh, don't bother.

Whilst the Mira is undoubtedly a high quality
product, it suffers from a vital flaw is that it
doesn't have separate flow and temperature controls.

The 415 only has manual flow control and auto pressure balancing. No auto
temp control to maintain a setpoint temperature, only manual by mixing hot
and cold water to user requirements.

The Excel mixer controls the flow through the mixer and a fast acting
temperature control, one reason why Simon Stroud experiences virtually no
fluctuations.

My mother uses the cheap thermostatic one
downstairs as the Mira is too difficult to set
the temperature of and can't have the flow turned down.

I agree with the first part (but don't mind the high flow) and like to
leave
the temperature setting alone and use the flow control as an on/off, not
experimenting to get the right temperature every time.

Christian.