In an earlier contribution to this discussion,
Olly wrote:

Well just tested flow rate and its 20 litres a min. Would this be
sufficient for a mains presured hot water cylinder such as megaflo or
would I require the pressure of the water as well.

Flow is more important than pressure - unless you live at the top of a
sky-scraper.

Does this mean that
in theory a shower would produce about 40 l/min if both hot and cold
are fully open?

Only if you can find a way of defying the laws of Physics! g

Of the cold water coming into the house, some will go to the cold tap and
some will go into the hot cylinder, expelling hot water to the hot tap. But
you've only got 20 litres/min in *total*. Where do you think the other 20 is
going to come from?
--
Cheers,
Roger
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