Couple of quick questions for those familiar with plumbing regs....
I'm moving a cold water tank from under the stairs to the loft.
Do I need to run seperate outlet pipes from the tank to the hot
cylinder and to the cold taps, or can I just tee off the hot cyl feed
from the cold tap pipe (This would save me an extra pipe run)
Is it necessary to have the ballcock and outlet on opposite ends of
the tank to get circulation, or can they be on the same side ? It is a
'coffin' style tank, about 18x18x72"
Thanks for any advice to this occasional plumber...!
You'd have to make the single supply pipe a much larger diameter for it to
properly supply both systems. The reason these systems have two separate
pipes is the fact that they normally supply the same amount of taps on each.
So for the tank to able to maintain the same volume of water to each system,
the pipework needs to be the same on each, therefore, you'd need a much
larger diameter on a single pipe supply, than you do on a two supply design.
Hope that makes a bit of sense. :-))
On 8 Nov 2003 11:36:26 -0800, firstname.lastname@example.org (Mike harrison)
I don't know that any regulations apply to this aspect, but it would
be better to have separate runs IME, otherwise you will find
interaction between hot and cold tap flows when you run them.
There should be a sheet of instructions with the tank. You should
have a Byelaw 30 kit with the tank, or get one. This consists of
various components such as a screen to prevent creepy-crawlies
entering the tank through the overflow, an insect proof screened vent
to allow air in and a small syphon tube for the overflow.
There is no particular requirement regarding fitting of outlets in
relation to the float valve.. However it is a good idea to position
the outlets at different heights. The outlet to the hot cylinder
should be slightly above those for the cold taps and shower(s).
That way, if the tank empties, the hot water stops flowing first. The
other way round and you could be scalded.
It is recommended that the inlet and outlet be at opposite ends of the
cistern to ensure the best exchange of fresh water through the system. even
more important on coffin cisterns. Having the outlet below the inlet at the
same end can lead also lead to air being drawn into the system.
I upgraded our loft supply to the hot tank from 22mm to 28mm (and had to
change the fittings at the hot tank too). This was in order to deal with
the case when someone uses a hot tap whilst the gravity shower is being
I'd run separate pipes (slightly more hassle, but you are in for hassle
Yes, to reduce chances of "stagnation". Close fitting lid too.
Also, the outlet for the hot tank to be higher on the storage tank than
other outlets: so that when the mains supply goes off for some reason the
person in the shower isn't scalded since the hot tank runs out of supply
the cold supply to the rest of the house.
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