On Fri, 03 Dec 2004 12:15:50 +0000, Fred wrote:

snip
Oh no.


OK to rescue this I think you will have to rework a few pipes.
You need to get the boiler fed from as far back as possible.
Please measure the full on flow rate of the cold tap at the kitchen sink
or garden tap [1].
If you get 16l/min or more you are probably going to be able to rescue the
system. It might help to put a restriction on the flow immediately after
the T to the boiler feed.

You might have to upgrade the incoming main to 25mm MDPE rather than
7 lb./ft. lead.

The standing pressure is presumably quite enough to fill the boiler
primary circuit although that would only show you had 1.x bar if yoiu
have 2.x bar or more then really you have just got to get more water from
the street main.

I duuno but at this level of the market the boiler presumably has a
hot/cold standby mode option, this will help with the delays.
Re-route, re-size and lag pipes to the shower.

The only way this system could not be fixed is if the standing pressure
was very low (hardly enough to feed the old loft tank).


HTH

[1] This may be a pessimistic value if the garden tap is fed through one
of those 'kits' whcih make a pin hole (okay 5mm hole) in the side of a
mains pipe. Likewise if the sink is a monblock mixer fed via narrow
flexibles it will not be a good indicator.



--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at www.diyfaq.org.uk
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