"Tim Mitchell" wrote in message
...
In article , IMM writes

"Andy Hall" wrote in message
.. .
On 13 Aug 2004 04:28:33 -0700, (armitageshanks)
wrote:

Hi,

Can someone help?

I have installed a mixer shower in my bathroom assuming the cold tank
in the loft above the bathroom and the hot tank in the bedroom next to
the bathroom would all be in the right places to provide a decent
shower.
How wrong was i????????

I have a really nice looking shower with a really annoying dribble
effect?
I have heard that you can get shower pumps to boost the water pressure
which connect onto the hot water cylinder.

Can any kind person confirm whether this will improve the rate at
which the water is forced out, and also and recommendations would be
appreciated.

Thanks,

Nigel

Yes it will do as long as the plumbing is done correctly.

The important thing is that 22mm pipes are used throughout, especially
on the input side of the pump. You can perhaps do the last metre or
so to the shower valve in 15mm if needed.

Shower pumps do not like sucking.
Preferably install the pump in a location such that the main runs of
pipe are on the output side for this reason.

Also, install the pump relatively low. The airing cupboard floor is
usually a good bet. The loft is not.

Nothing wrong with the loft as long as the pump is on the loft floor
below
the cold water tanks water level and the inlet pipe goes back to the
cylinder, not teed off the open vent pipe.

The problem is, that will put the pump at a high point in the pipework
and it will keep getting airlocks in the hot side. At least, ours did,
if I did it again I would install the pump low down.

An auto air vent on the pressure side of the pump will sort that. You don't
need an auto air vent if you purge the line of air by loosening a pump
union. Any air left in the loop will be pushed out using a high pressure
pump. The only time air will ever enter again will be when the cold tank
runs dry.