"Robert Laws" wrote in message
oups.com...

I know this has bee ndiscussed recently, but I don't think this
particular question has been answered.

When a direct heating combi boiler is used there can be a conflict
between a thermostatic shower mixer and the boiler's own temperature
control. Ideally, to get the most powerful shower, one would like the
boiler runnign aty full tilt, with the water flow adjusted so that the
temperature is nice.

Cannot answer your specific question but I have previously installed a
thermostatic bar type mixer (Screwfix or other Italian unbranded) on a
Combi installation and it has performed well. Since the temperature of the
combi delivery lags any imposed change in flow I would anyway have expected
a decent thermostatic mixer to cope.

Jim A