On 16 Aug, 19:13, "Heliotrope Smith" wrote:
"Patb" wrote in message

ups.com... After replacing the ball valve, thinking that was leaking and causing
the overflow to go, I have just realised that warm water is coming up
from the immersion in the bedroom up into thelofttank.
Grateful for advice on what I should do to stop this,
thanks

If the cylinder is heated indirectly from your boiler then it is most likely
that the primary water coil is perforated.
Only option is to replace the cylinder.

OK, not an expert but....

the water can be heated by either the immersion of the Gas boiler.
The central heating system is vented.
Re the water getting into the tank, not sure about this. It is coming
in from a large pipe that connects to the tank in the loft via the
side of the tank at the bottom. Do I have to track this pipe to see
where it connects to the immersion?
Thanks for the feedback so far