Recent content by karlk

I installed a central heating system some years ago for a client which has never worked very well and having tried all the usual methods to get decent circulation I realised that, because it is small cottage with no attic space there is not much head. If I pressurise the system that is...

air admittance valves are great and do not let out any smells I have installed lots of them.....can be in roof space

one approach I have used is to put a hose pipe from the mains onto a low drain cock (vented system only) directing the flow by shutting off parts of the system that work ok and pushing the air out through the expansion/feed pipe........you need an assistant in the attic to prevent flooding!