On 2 Apr 2004 11:24:18 -0800, (James) wrote:

Hi,

I have a plumber who's fitting a Stuart Turner Showermate Shower Pump
& Hudson Reed 3/4" thermostatic valve (from Bathstore) for me (you
might argue this wasn't DIY, but I have fixed the electrics myself!).
Question is this (and I think it is on topic for the ng): he's using
15mm flexi-piping: about .5 m from the hot tank to the pump, and about
3m from there to the valve (all but the last 50cms which are 22mm
copper pipe). The instructions both for the pump & the valve say "use
22mm piping if possible", but he (and the wife) reckon that as the
pump entry & exit tubes are 15mm, it's not going to make too much
difference.

So, if any of you have experience of this sort of set-up, please tell
me: is this going to turn our rainstorm into a piddle? Or not really.

As much of the pipe runs as possible should be in 22mm, but you don't
say how long the runs are from the cylinder to the pump.

There's no point in having just the last section in 22mm. Really,
only the pieces immediately adjacent to the pump with the short
flexible hoses that Stuart Turner supply should be smaller.



Ah yes: gravity system; hot tank, pump & bath on first floor, cold
tank on second floor.

And a PS. The obvious cold feed to use for the pump might be straight
from the mains, I haven't checked. Would that be a bad idea?

It must be directly from the cold tank and not the mains. Don't let
him bodge it by tapping into a pipe in the airing cupboard.

The hot take off should be from the cylinder using either a separate
tapping or a Surrey or Essex flange on the cylinder.

Otherwise the shower, even though thermostatic, will tend to pulse hot
or cold as taps are turned on and off.





Thanks.

James

..andy

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