Colin Wilson wrote:

I've tried to play safe when ordering taps for the bath / sink by
going for 0.2bar jobbies, but I don't know how low I should be setting
my sights at for a shower mixer valve (i.e. would a 0.5bar be ok ?)
Chances are you have mains pressure of at least 1 bar.

...wonder how well one of the large shower heads will cope... missus
likes them...

The large drencher heads can often swallow quite substantial flow rates
( 15 lpm) and can be out of reach for many basic combi boilers.

With a combi the pressure should be equal (roughly) anyway.

Nah, nowhere near - either that, or i'm confusing pressure with flow
rate again - it's a downstairs bathroom, and the main comes in about 6
feet from the bath taps, and the cold tap is plumbed direct to it
(give or take a tee for basin and bog) - the boiler is almost directly
above, but on the first floor.

It may be that either your combi is one of those that regulates its
output flow rate - which in in some ways is good since it limits the
temperature swing, or, it has been fitted with a pressure reduction
valve on its inlet.

With my one for example, it places no restriction on the water flow rate
through the boiler (apart from the extra flow resistance introduced
through the plate heat exchanger) - you can run the "hot" as fast as the
cold, however the water won't be very hot at that flow rate.


A mixer that responds to a rise in temp by increasing the cold flow rate
works better in these cases.

Aha - I think that's what I was babbling on about in the previous
sentence - any ideas how you can tell one from the other ?

Some explicitly state they are suitable for combis and multipoint heaters.

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/