My house has been plumbed so that everything apart from the kitchen tap is
fed by the tank in the loft (that's 3 loos, 3 basins, a bath and 2 showers).
Consequently in the morning with everything being used the tank upstairs can
run out of water. As a quick fix (before getting involved in major
replumbing) I'd just like to get the tank to fill up quicker. The existing
standard ball valve only allows a limited amount of water through it as it
all appears to have to get through an approx 5mm hole. Is there a better
valve available, ideally one which would allow the full capacity of the 15mm
cold feed to fill the tank. I may also have to put a second tank alongside
it and run them in parallel.
Try a 3/4" ball valve. You will have to fit a 3/4" FBSP x 22mm fitting and
have a 22mm x 15mm reducing compression set that fits inside the 22mm
section of the fitting. This will ensure full flow and make sure the
overflow is not undersized.
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If you have a stopcock in the way then make sure it is fully open or replace
with a "full-bore" ball valve, screwfix sell them. The ball valve in the
tank may be restrictive, if so then replace with a Torbeck type valve
assembly as these flow much faster. An alternative to an extra tank might
be a larger tank or to put two ballvalves on the one tank.
Oh yes. Agricultural suppliers have a wider than normal range of
ballvalves, although you'll probably need several pipe adapters to get
down to 15mm, since they're usually 1" or 3/4".
Another alternative is to T off the supply pipe and have a second
normal ballvalve coming in. Probably the cheaper option, about a fiver
BUT, first thing in the morning water pressure drops rapidly because
you're not the only one drawing it, so I'd personally go for the
second tank in parrallel option. One or two 28mm pipes running between
them ought to be adequate.
Simon Avery, Dartmoor, UK
uk.d-i-y FAQ: http://www.diyfaq.org.uk /
On Mon, 19 Jan 2004 17:01:20 GMT, firstname.lastname@example.org (Simon
Yep, I've done both of these in the past.
Adding an extra float valve, I found, could increase the filling rate
by about 50% as long as there is adequate mains pressure and the
pipework is also adequate in bore.. If not, it may not make a huge
Adding a second tank is certainly helpful but there are some caveats.
- Make very certain that the roof structure can take the added weight.
Every litre of water adds a kilo - a typical 200 litre tank..... roll
of drums... 200kg. The weight needs to be distributed and there
needs to be adequate support as well - locating over a load bearing
wall is common.
- The tanks should be piped together, and it's important to fill into
one and extract from the other in order to maintain a flow and avoid
stagnation in the second tank.
- Each tank should have a separate and adequate overflow.
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