Auto air valve

It’s not higher, it runs below the header rank water level

The header tank is as high as it can be in the loft as there was an issue with the vent sucking air into the CH system, raising it sorted the problem
 
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Bathroom Is a feed from behind the hot water tank and not from the loft
 
See the rest of my post in that case...
If not I suspect air is being pulled down the vent pipe when some taps are in use and it is rising up to the tee afterwards.
You may be able to prove it by holding a glass of water over the mouth of the vent pipe and getting someone to operate the various taps in different combinations, see if the water disappears up the pipe.
Also,
The header tank is as high as it can be in the loft as there was an issue with the vent sucking air into the CH system, raising it sorted the
That's the wrong header tank, we are talking about the bigger one. But the problem your heating had is the same one.
 
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Just as well this is not urgent . It may be some time for JD to stumble upon the right answer
 
In an ideal world this forum would be full of people who wanted to help but it seems the moderators are on another planet.
 
the bigger tank has been in the same place for 30 years so confused as to why this would need raising now, it is higher than the pipework but i would say not by much, a few inches, would the AAV not relieve the air ?
 
the bigger tank has been in the same place for 30 years so confused as to why this would need raising now, it is higher than the pipework but i would say not by much, a few inches, would the AAV not relieve the air ?
Something on the installation has changed in the last 30 years,the original gravity system was designed to work the way it was installed and any changes/alterations could have an adverse effect.
Also the hot water take off to the kitchen and cloakroom will have some horizontal pipework in the loft,the outlets on this branch could be pulling in air from the openvent or the cylinder is producing excessive air bubbles that get trapped in the kitchen cloakroom distribution pipe.

an easy repair for a qualified plumber :idea:
 

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