I currently have a Combi fed Mira 415 surface mounted shower mixer supplying
my shower head which is over the bath. When I come to re-fit the bathroom I
am wondering if I really need it. Is there any disadvantage in just having a
bath mixer with a shower diverter valve?



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John

Take pity on a Hoody.
They suffer from limited peripheral vision and must have difficulty walking
with the crotch of their tracky bottoms at knee level.

On 17 Jun, 11:27, "John" wrote:
I currently have a Combi fed Mira 415 surface mounted shower mixer supplying
my shower head which is over the bath. When I come to re-fit the bathroom I
am wondering if I really need it. Is there any disadvantage in just having a
bath mixer with a shower diverter valve?

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Mira 415 combiforce is I believe pressure balanced although not
thermostatic.
If you just have a normal bath mixer diverter, you will find that if
someone turns on a cold tap, instead of the pressure dropping and the
temperature remaining roughly the same, the temp will suddenly get
very hot. Could be dangerous, although some have a max temp shutoff.
If hot tap turned on, shower may go very cold.
It's possible to have a separate pressure balancing valve on inlet to
the bath mixer in you need it.
I have a thermostatic bar mixer fed via a pressure balancing valve.
Best of both worlds.
Of course you can get very expensive showers that do both.

Plain mixer, if its just you in the house, may be OK, although don't
use the washing machine when in the shower !
Simon.

On Tue, 17 Jun 2008 11:27:59 +0100, "John"
wrote:

I currently have a Combi fed Mira 415 surface mounted shower mixer supplying
my shower head which is over the bath. When I come to re-fit the bathroom I
am wondering if I really need it. Is there any disadvantage in just having a
bath mixer with a shower diverter valve?

We used both and found the controlled one was a pleasanter experience
when the inevitable knob ran a tap. (The screams of rage from the
bathroom disturbed the peace and quiet)

If the boiler is working properly and the supply uninterrupted from
elsewhere the ordinary mixer is fine.