I recently bought a house, and with the winter starting to set in (UK), have started putting the heating on in the mornings/ evenings.
As many people are at the moment, I am currently working from home - and have noticed that the radiator in my office doesn't work particularly well. It seems to get hot at the bottom, and in the pipe feeding it, but the middle to top of it remain cold. I assume that this means that there is air trapped in the system, and that it needs bleeding.
However, there doesn't appear to be a bleeding valve on the radiator, and having looked at the other radiators in the house, none of them appear to have any (though the other radiators all seem to work fine) - the house is an ex council-house (built in the 1970s):
I came across this question about how to bleed radiators which don't have a valve, and an answer on there suggests that "There is often an automatic bleeder/vent on or just after (in which case it's often on a big cast iron "air separator" that may have an expansion tank hung off its bottom) the boiler".
I had a look for this, but all I could see in the airing cupboard which looks like it might be the valve talked about, was this:
I'm a bit loathe to try loosening it until I'm sure it's what I want to be doing... Can anyone verify whether this is the bleeder referred to in the answer on the other question?