feed tank warm water!!

[johnmartin057]

My gravity fed c/h c/w system has a problem. the cold water loft tank is overflowing and the tank has warm water in it. The inlet is not leaking, the water appears to be coming from the hot water tank via the cold tank inlet. help nb: this is the feed tank, not the expansion tank

 

[BingoBongo]

trace the vent pipe as it maybe coming from your heating.

turn off ch and see if it stops

do you have a power shower? or any recent plumbing alterations

what is the hw like.brown and really hot/nothing at all

 

[johnmartin057]

hot water colour is fine; temp ok
new bathroom fitted ; completed 6weeks ago
cant turn c/h off yet-missus is freezing
vent pipe clear

 

[BingoBongo]

good getting somewhere


new mixer taps by any chance?

mains cold water ?


passing up the hot when taps on

 

[jackecole]

does your feed and expansion tank have a higher water level than your cold water tank?

 

[johnmartin057]

new mixer shower fitted, not used every day
mains c/w to new bath and sink taps
expansion tank fitted above cwtank
c/h thermo recently bypassed by me due to faulty wireless tx
hot water at kitchen sink takes ages to come through, only started recently
hot water comes on 1 hour later than c/h, this is a new setting at timer by me; also goes off 1 hour before c/h

bit of a nightmare scenario!
any advice is appreciated
switching c/h off changes nothing

 

[twgas]

Mains cold water in bathroom would indicate it also connects to shower and is back filling tank fed hot water system, shower should have cold water from CWS in loft so that hot and cold pressures are equal.

 

[johnmartin057]

cold water feed to shower is from cold tank, not mains

 

[twgas]

Are any mixer taps fed by main cold AND tank hot?

 

[ManxPlumber]

expansion tank fitted above cwtank

Feed/flow to/from F&E MUST be below feed/flow to/from CWST - that means the F&E tank should be below the CWST

 

[ManxPlumber]

the water appears to be coming from the hot water tank via the cold tank inlet.

So how's hot water getting into the cold supply?

Sounds like something's not right, can we have photos of the setup

 

[seco services]

the water appears to be coming from the hot water tank via the cold tank inlet.

So how's hot water getting into the cold supply?

Sounds like something's not right, can we have photos of the setup

cold mains is passing to gravity hot through a mixer valve or shower.

 

[ManxPlumber]

a. new mixers have check valves fitted, unless they were removed by the installer
b. I said how's hot water getting into the cold supply, not the other way round

 

[seco services]

a. new mixers have check valves fitted, unless they were removed by the installer

don't mean nothing quite common for them to stick open.

 

[johnmartin057]

Ref ManxPlumber expansion tank has been above cw tank for 25+ years