I have a Worcester and a Mira 415 shower valve. This is NOT thermostatic -
but pressure equalising (see their web site). If other taps are suddenly
opened the shower pressure drops - equally on hot and cold - so no problem.
It has worked well for 12 years. Only slight snag is in the winter when I
find it best to 'warn' the boiler that I need the 3 way valve moving by
running a tap for about 5 seconds. This ensures that the domestic water gets
priority.
Mira 415
The Mira 415 is specifically designed for those with a high pressure
hot and cold water supply, or with a fully modulating combination boiler or
instantaneous gas water heater (please check with your installer or call
Mira Customer Service for details).
a.. Pressure balanced to maintain a constant showering temperature,
even with variations in supply pressure, making the showering experience
consistent and enjoyable at all times
b.. Maximum temperature stop limits selection of an unsafe
temperature, which can be over-ridden by the use of a discreet push button
c.. Produces a powerful water flow rate - like that of a power
shower - because it is designed specifically for high pressure water
systems. There is no need to add a pump
d.. Supplied with Mira Response power shower fittings - featuring
three exciting power spray patterns: Start, Champagne and Massage
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Regards
John
"The Natural Philosopher" wrote in message
...
IMM wrote:
"Eno Case" wrote in message
. ..
IMM
I don't see any downside whatsoever from running a shower from a combi.
Maybe I misunderstand how they work, but I'd been led to believe that if
the
shower is supplied from the combi, then for the time that the shower is
in
use, the radiators won't get supplied with water therefore cooling the
rooms down? (And some showers take longer than others... ;-) )
That is true. But if a house is up to temp that will not be a problem.
Also there are overpowered fro CH and when they come back onto CH they
warm
like the wind.
It will have to be a very long shower to effect the heating temps.
Also, if the shower is in use, and someone does use a hot tap, the
shower
would be affected somehow, even if it is a good thermostatic one?
You install a pressure equalizing valve. Some shower mixers have them
built-in, see the Screwfix catalogue. Turning on the kitchen tap,
unless it
is a bottom of the flowrate range combi, will not effect the shower too
much
at all. Best get a combi that delivers 13 litres/min minimum. Some
combi's
right up to 22 litres/min.
haha. It depends on teh combi and the mains pressure. I vidly remember
trying to wah my hands in a GF's downstairs toliet whuile the teenagers
upstaits had showers. No way Jose.
That the point about yer 400 quid combi. You get what you pay or.
If these points are wrong, I'll gladly stand
corrected, and be even more
keen to get a thermostatic shower!
They are wrong.
I suppose there's also the issue of not having a backup hot water supply
(like an electric shower could give me) if the combi boiler breaks down,
but
that's not a big worry to me.
You can fit an instant electric heater in the hot outlet of the combi.
If
the combi is down turn it on. It only trickles, but backup it is and it
will clean you. All problems solvable.
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