Thanks JohnD. Hope these responses help?
It is a power shower (with electric pump)
The tank is in the loft.
Water is heated by the boiler (and there is an immersion as well)
The plumber told me it was an airlock and each time to fix it he undoes the pipe by the immersion tank (the...
Would really appreciate your help on this one.....
I can turn my shower on and get a good supply of hot water coming out but there appears to be a cold water airlock because if I try and add cold water the shower stops (it is too hot to get in without adding cold water).
I have had a...