On Wed, 18 Aug 2004 09:35:14 +0100, "Bob Mannix"
wrote:


"Jonathan George" wrote in message
...
"John Rumm" wrote in message
...
Jonathan George wrote:

snip
the rising main. The shower installation instructions say that I
should have a separate 15mm feed from the cold water cistern to the
shower, and a 15mm feed from the hot water tank taken off below the
join to the vent pipe and before any other draws. All sound ok?

Yup - you should install the dedicated cold feed for the shower so that
it is sighted a little lower in the cold cistern than the feed that goes
to the hot water cylinder. That way if the cistern gets drained it is
the hot water that stops flowing first!
snip

Thanks for that. One more question. If my new cold feed for the shower has
to come off the cistern below the existing one to the hot tank, how do I
make a new hole in the tank without flooding my loft! Also, how important
is
the thing about putting it lower down - the existing one is pretty low
down
so there isn't that much more space.

You have to empty it with a jug and a bucket. It only needs to be just below
so that the top edge of the cold is level with the bottom edge of the hot
outlet. It depends not only on who is using the shower but on who might in
the future - a shower that goes scalding hot generally makes people panic
and ask for more cold, sometimes they don't think of just shutting it off
and they get scalded. A shower that goes freezing cold just makes them
cross! You have to cut a hole anyway, so best to try and get it in the right
place even if it does mean 10 minutes with a jug and bucket.

Another approach if the existing outlet is very low is to cut another
higher up and connect the existing pipe to it, then use the lower
existing one for the shower.

In terms of cutting the hole, a decent hole saw is important. The
type with several thin concentric blades where you select one to use
are fairly crappy. The type with a mandrel where you then buy a
cutter of the correct size are very much better. You can also get
electrician's and plumber's sets of these which are cheaper than
buying separately.




..andy

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