can anyone help...?
pressure problems in the shower...
We turn on the shower, and the pressure is low, leaving the water running, I go to the
laundry and turn the cold on, and wait til the pressure changes, then turn it off, i then go back to the shower...and
magic....the pressure is now good, hard n fast.
Why does this happen?
Never use to do this...
Driving me nuts..... How do I fix it?
Had two plumbers round, and both have never seen it happen before....
Hope this makes sense....
Cheers
Kat

Linkback: https://www.plumbers.nz/q-and-a-water-pressure/50/water-pressure/620/

Do you have a pressure limiting valve in the house?...i only say this cus we had one job once where the persons kitchen tap was loosing pressure but if you went and opned the hose tap then closed it the pressure would come back to acceptiable pressure...then you would turn off the kitchen tap and then back on and blamo the pressure had dropped again....after much ripping down of jib we found the old limiting valve installed half way across the garrage??? it was shot and so we replaced it and all was fine....

im just wondering if the increased flow demand is forcing the faulty limiting valve open with the increased flow and after you stop all the water the faulty valve is resetting so you have crap pressure...cus what your experiencing sort of sounds the same as what happned at this other persons place...

when/if you find the problem please post solution here because im very intrested to know what your issue was please

cheers  Thunder

Hi,
ok. so the plumber has been, and this is what he has done....
he located the pressure limiting valve (i think) off...
now the pressure is back to where it was YAY!
even more pressure on some taps
I do fear that this may cause another problem, but time will tell i guess..??
Any thoughts or opinions welcome..
 Cheers

Kat

Thunder, Kat thanks i also learnt something new as have never come across that sort of problem to date..

On a slightly similar topic has anyone had issues installing a Foreno unequal low pressure kitchen mixer??
Ive replaced an old kitchen mixer with a new Foreno mixer, and the hot pressure is now about half of what it used to be at the mixer... The supplier says the HWC pressure is not enough but the pressure at the tap is well above the minimum rated pressure for the mixer!! Any thoughts??
Maybe I should turn the hose tap on at the same time like Thunder 

hi guys, thanks jax that is how it should be,as you know we learn every day and it is a sad day when you don`t learn anything. it should be as easy as the 16points i got for doing the rinnai assessment,cheers

Hi Thunder,
hey do you know...now that we have no limiting valve, will this mean we will go through
the water a lot quicker, especially the hot water?
Also, should we really replace the limiting valve with a brand new spanky one?
cheers
Kat

yes kat you must replace the limiting valve because this protects the hot water cylinder(if it is a mains cylinder) and the rest of the house from over pressure spikes most common at night time when no one is using water...Gee i would have thought the plumber would have already replaced the one he removed?...If you have a mains pressure cylinder then by code you need a limiting valve...Normaly situated where the water supply enters the house to protect the whole plumbing installation...Im with robbo put one in please as it sounds like you have very strong supply pressure.

Yes kat i thought one would have been put back in to replace the origional...but i wasnt there so im not privy to the whole situation...just call the plumber who ripped it out and ask as to why it was not replaced...there may be other reasons as to why he didnot replace the origional...maybees your mains cylinder already has one in the valve gear off the cylinder?...anyways a copple of hundred should see it replaced...it might seem alot but remember a new one should last another 15-20+ years so in the big picture it not alot for the length of service you should get from it.
anyways good luck kat
Thunder