In article .com,
"Robert Laws" writes:
To solve this one needs a thermostatic shower mixer that controls the
cold supply, not the hot and ther woul dbe a limiter in the hot supply
so that 'full on' gives a temperature a bit above a comfortable shower
tempertaure.

Are there any thermostatic mixers that control only the cold flow?

Specifically, for my application, is there one that would mount on the
bath as a conventioanl bath/shower mixer with a spout for the bath and
a hose connection for the shower?

You need a thermostatic mixer designed for Multipoint and Combi use.
They are more complicated than just controlling the cold, but they
know they can't adjust the output temperature by just adjusting
the hot flow. They are also very fast acting (unlike the wax pellet
bar type), but are more expensive as a result. They are also designed
for high pressure cold feed a hot feed which can rapidly change from
low to high pressure and vice versa whilst in use.

--
Andrew Gabriel