"Potsie" wrote in message
om...
My plumber plans to put in a separate dual-impeller pump for each of
my three showers. A colleague has suggested that since this is a new
installation it would be better to have 2 better single impellers (one
hot, other cold. Does anyone have an opinion on this?

Many thanks
Potsie

I am about to run a second shower off my dual impeller pump - the pump can
allegedly run two showers at once (rated 3 Bar). Given that the showers will
not always be used at the same time this should be more than adequate.
However, we will see :-)

You can get larger pumps which I presume could run three at once.

It is not clear to me if two single impeller pumps are better than a twin
impeller - I presume they probably would be, but would be more expensive.

I see no particular reason to have three seperate pumps; they would all be
sucking on the same hot water tank which could cause interesting problems if
they are not set up right, and would at a minimum have some interesting
pipework.

I would feel happier with a single bigger pump pressurising the hot water
system and not competing with the other pumps for the hot water cylinder.
[Same goes for the tank fed cold.]

BTB you are going to need the mother of all hot water cylinders (and cold
water header tank) if you are planning to run three power showers at the
same time :-)

HTH
Dave R