Wc Cistern Plumbing Query

[rumpelstiltskin]

Is there a reason (eg pressure) why the feed to a cistern should have to rise a certain amount? the pipework in my cloakroom comes down from upstairs, along the wall about 10" off floor, then rises up again to cistern. I would like to run the pipe along the wall at a slightly higher point (approx level with bottom of cistern) so I can add a supply to an outside tap but not sure if this will *** up the supply pressure to wc or sink?

[KARL]

The supply to your cistern is classed as a "pressure pipe" and assuming it comes directly from the public supply then re-routing it as you describe would make absolutely no difference to the pressure at the (presumed) float valve in the cistern or any other tap, etc. in that room or elsewhere. Think of a garden hose and how it matters not if you stand watering the roses and somebody lifts off the ground the last couple of metres of it behind your back - no change in the performance.

[TonyV]

No will fine, but cistern will take a bit longer to fill if you are using outside tap. To save yourself a bit of time, why not just T of your existing pipe work where you want outside tap?

[The Builder]

When you fit your outside tap, it would be a good idea to have an isolator (on/off valve) just before it passes through the outside wall.
When a hard frost is expected, it can be shut off.

[TonyV]

Builder forgot that advise I just put shut of valve as matter of course.

[Ryzen]

..and... come out of the wall and run the pipe down to the outside tap...so that you can drain off in the winter..:-)

[TonyV]

Ryzen if isolator valve is fitted internally you can turn it of and leave outside tap open so no freezing chance.

[Ryzen]

If the pipe comes up to the tap then water will remain within the pipe..and could freeze.

[TonyV]

not if you have isolation valve turn it of and leave tap open.

[Ryzen]

Tony....are you saying its better to leave trapped water in the pipe..with the tap open and iso closed..or design it properly and be able to drain it down after closing the iso.

[TonyV]

Ryzen with water cut of and tap open, only thing that will come out is ice. Alternatively put box around tap and fill it with insulation.

[Ryzen]

..or design it properly..no water = no ice=no ugly box and insulation.

[lankeela]

Sorry can't help - just saw the title and remembered I first came here to ask a question about a WC cistern not filling up - and that was on 13th November 2005! Your life will never be the same again.

[lankeela]

1101 questions and 12682 answers later I am still here!

[alavahalf]

Happy anniversary .. and how is your cistern ?

[TonyV]

Ive only been here since 2011, so just a newbee?

[lankeela]

Strangely it has got the same problem again now! Been fine for all these years till about a month ago.

[rumpelstiltskin]

Thanks Karl and TheBuilder. Re other discussion on outside taps, in my case the cloakroom is downstairs next to the door, with the cistern against the outside wall. So I would just be drilling through the brickwork and running a new section of pipe, off the existing feed to wc, to install an outside tap at the same level- hence no pipe outside either up or down. This is why I wanted to move the arrangement of the pipework inside.

[TonyV]

Whats the problem then Keela?

[lankeela]

Think its the lever on the ballcock, filling very slowly after its been flushed.

[TonyV]

Leena if you take lid of cistern hold ball cock up, flush loo, then lubricate ball cock hinge with some WD40, should do the trick.