Fred wrote:

"Kevin" wrote in message
oups.com...

I am about to install a Salamander ESP100CPV shower pump. The easiest
place for me to put it is in the airing cupboard above the Hot Water
Cylinder. The intructions indicate that I can do this as long as I fit
an anti-gravity loop at least 250mm in depth.

OK, all well and good but at the risk of sounding foolish, is this
something I can buy ready made or do I need to construct one ? If the
latter, what is the best way of doing this in 22mm copper, I don't have
a pipe bender. I guess what I'm really asking is will there be any
problem if I form one out of short straight pieces of pipe with 2x
90degree elbows ?



The whole point of the loop is to dissuade dissolved air from entering the
pumps impellers.

ITYM it is to prevent convected circulation from causing the pump to
start all by itself even when the shower is not turned on

(preventing air ingress is one of the reasons for using a dedicated
shower flange to feed the shower (Essex / Surrey / Warwix etc))

I can see any reason why you can't construct one yourself
though to retain optimum flow rates a swept 180 deg turn using a spring or
pipe bender would be better than 2 elbows.

Yup definately stick to swept bends in this application.

--
Cheers,

John.

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