We have old and largely past it central heating system which I am loathe to replace because I think we'll shortly be selling the house. However, one of the radiators has always required bleeding. The pipework is microbore, and all of the radiators are what I understand to be double entry valves - that is, they have two pipes entering from one end.
My thoughts are that there is a loose connection on a radiator valve, a pinhole in a radiator or a leaking pipe somewhere, but consulting a couple of heating engineers has yielded no useful information. I wonder if anyone has any ideas? I have assumed that the leak must be between the radiator and it's immediate predecessor on the circuit otherwise the air would just accumulate in the previous rad?
Second query: what size of boiler in BTU would you expect to see in a large 4 bedroomed house?
Thanks and have a good Christmas.
Iain