Col water Storage Tank

[darren197106]

My Cold water Storage tank is overfowing. I've changed the Ball Cock..still the same. the vent off the Hot water cylinder is not pitching...

Help!!!

 

[JohnD]

You have a hot water cylinder. Is the boiler supplied from a feed and expansion tank in the loft? Which is higher - the F&E or the CWC?

Have you got a mixer tap, such as a shower or sink mixer, where the cold is fed from the mains and the hot is at tank pressure? If so, does the mixer have service valves alllowing you to cut off the hot and cold supplies to the tap?

Is it a ceramic disk or joystick mixer?

 

[stevehayes]

why does it matter if the f&e cistern is higher than the cold water tank? i know the f & e is supposed to be lower but why? !!

 

[darren197106]

C/H is a sealed system...top up valve in the hot press...
I do have a set of mixing taps downstairs in the kitched... I recently had my house renovated....the plumber put in two large coffin tanks...one ball cock

 

[darren197106]

there are mixer valves which would alllow isolationof the hot and cold supplies to the tap

 

[JohnD]

stop using any water, running taps, flushing toilets etc for half an hour

run up to the CWC and verify that it is full and overflowing.

then run down to he mixer taps and isolate them with your service valves.

read the paper for twenty minutes

then run back to the CWC and see if it is still overfowing or if it has stopped.

If it has stopped, your mixer tap has an interal leak allowing mains-pressure cold water to leak into the hot pipe, whence it ends up in the CWC.

 

[darren197106]

Just thinking.....it only overflows every now and then...i obviously don't use the water during the night...so really it should overflow every morning...but it doen't...i

f it is an internal leak on the mixers do I have to replace the mixing set or just install a non return valve on the hot water feed??

 

[JohnD]

safer to change the mixer.

non-return worth a try as cheaper.

If it has ceramic disks it might vary with position of the control, maybe there are worn parts

 

[darren197106]

mixers are only a year old...fairly expensive stainless set....

 

[darren197106]

Are the ceramic disks on the taps??

 

[JohnD]

some taps have ceramic disks inside, not tap washers. the knob, handle or joystick will usually only move a quarter of a turn, not round and round.

 

[darren197106]

http://www.taps4less.com/PP/D-PREL104.html


Similar to these

 

[darren197106]

http://www.taps4less.com/PP/U-PN335L.html

sorry more like these ones

 

[JohnD]

the first link looks like a traditional action with knobs that screw in and out and have tapwashers

the second one looks like the operating levers only turn 45 degrees and probably have a ceramic cartidge.

though English kitchen mixers traditionally have a divided spout to prevent hot and cold supplies mixing inside the tap.

I don't undrstand why ceramic mixers seem prone to internal leaks

p.s. if you have a mixer shower, bidet etc, check them too.

 

[darren197106]

Thanks for your help John, i'll try your suggestionon the sink mixing valves.....the shower mixing set would have to be mains fed... none of mine are so i think that rules the showers out....right??