Flowrate on mains shower

ACOperson · 17 May 2006

What approximate flow rate would a shower such as this be capable of delivering:

http://www.bathroomheaven.com/sp_showitem/2849

I expected around 15 l/m, but a colleague has suggested that they may be much higher (around 28 l/m). Can't find contact details for the manufacturer. Trying to size up for an unvented cylinder...

Ta

ChrisR · 17 May 2006

Would that be the colleague who doesn't have a shower in his bathroom?

I've come across some quite restrictive bar mixers like that (eg Grohe) which only allow about 15l/min at 3 bar. Some of the big heads really need about 40...
Depends a bit on the pressure of the mains or the p red v on the unvented cylinder. Oso 2.3 bar unless you get a special valve, Megaflo about 3.

ACOperson · 17 May 2006

Thanks Chris,

Mains is approx 2.5 bar working pressure, minimum of 22mm pipework from stopcock up to shower, then reducing to 15mm. Cylinder is a Range Tribune HE, P red V set at 3 bar for these I think.

Thought that a 150 l capacity cylinder might just do it but if the flow rate is over 15 l/m then it'll have to be bigger methinks....

ACOperson · 17 May 2006

Are there any other of this type of shower with integrated diverter that people would reccommend? I'm loathe to tell this guy to go with an unbranded one such as the one in the link...

ChrisR · 18 May 2006

Try grohe, mire, bristan ?

Reckon on using 1 x cold plus 2 x hot, so for a 22.5 l/min shower that's 10 minutes, and for a 15l/min it's 15 minutes from 150l.
Water would be reheating in each case. So not so bad if only one shower.

Does the Tribune have a high transfer coil, say 20kW?
10 l/min at 50º rise (you might be taking out) is 35kW. So the heating up during the shower, is significant.

ACOperson · 18 May 2006

18.9kw coil, reheat time 15 mins.

Suppose if the programmer is set correctly then even if 2 showers taken one after another, the second one should be hot by the time its taken.

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Flowrate on mains shower

ACOperson

ChrisR

ACOperson

ACOperson

ChrisR

ACOperson

DIYnot Local

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