Unvented cylinder output

Phil12345 · 10 Apr 2016

Hi all

Please excuse my ignorance -

Hypothetically, 20l/min from cold main, into unvented, what can you expect to come out a thermostatic mixer shower?

I mean once the water is mixed to reduce temperature to 40degrees so will have both hot and cold.

Newboy · 10 Apr 2016

Too many variables - type of shower head, supply pipework restrictions, isolators, valve body itself ........

Normally the shower valve specifies the supplies needed. BTW 40 degrees is a cold shower.

Phil12345 · 10 Apr 2016

40 degrees is cold??? I set the thermostatic thing to 40 and it is red hot???!

In normal conditions would you expect it to provide enough water to adequately use a big shower head maybe 20cm sq?

Phil12345 · 10 Apr 2016

Min temp req by mixer shower is 52 hot

Newboy · 10 Apr 2016

Min/Max supply flow rate and pressures are specified by the shower valve manufacturer

Phil12345 · 10 Apr 2016

Cheers mate, it's a triton excellente shower I want but can't find any numbers that mean anything to me!

muggles · 10 Apr 2016

You can't get out more than you put in! If your cold main is 20L/min, that's the most you'll get out total. However, if you follow previous advice and fit an accumulator as well as the unvented cylinder, you can expect significant gains on that

Phil12345 · 10 Apr 2016

Yup cheers muggles. Going to go with the unvented and see how it is with new bathroom knowing there is that option if I'm not happy. I reckon I will be though.

What finally killed the combi for me was thinking I have a little ensure and a main bathroom, I might as well lost the en suite shower completely with a combi as I wouldn't be able to use it at the same time as the main shower anyway!

Back up yes but no real point other than that

Phil12345 · 10 Apr 2016

And no muggles I understand I can't get more than that but wondered if it would be significantly less than 20 or more or less the same as 20

Phil12345 · 10 Apr 2016

Also if you were running a bath with both taps wide open would they combine to make 20l/min (or whatever it was after pipes valves etc) so 10 each?

muggles · 10 Apr 2016

Phil12345 said:
Also if you were running a bath with both taps wide open would they combine to make 20l/min (or whatever it was after pipes valves etc) so 10 each?

Approximately, yes, although you'll get a bit of flow restriction due to friction in the pipes and restrictions caused by valves etc

Phil12345 · 10 Apr 2016

Ok cool thanks muggles. That's pretty slow but I don't know what I was expecting really! I'll measure them again now

Phil12345 · 10 Apr 2016

Muggles on that point? If only cold is open is that at 20? And if only hot is open that's also 20?

Then as you open 1 slowly the other decreases until they match when fully open?

muggles · 10 Apr 2016

Yep, that should be what happens

Phil12345 · 10 Apr 2016

Cheers mate that's really helpful

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Unvented cylinder output

Newboy

Newboy

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