The radiator in our bathroom constantly needs bleeding. In comparison to
the other radiators it looks relatively new and has standard valves.
All other rads are fine but we keep getting air in this one. Any idea what
could be causing it and a solution?
If the system has been refilled within the last year it may just be air
dissolved in the water coming out. Hopefully it will cease eventually.
Ensure that the pump is off when you bleed otherwise you may draw air into
I think it probably is the highest one on the system (along with the bedroom
one). We haven't re-filled the system in the last year (unless removing a
downstairs rad for decorating counts?).
This one keeps on cropping up. There's no way that any loose nut etc should
draw air in. Anything loose usually leaks.Well that's been my experience.
Anyway, is it the nearest one to the boiler? That's usually the one that
gets the air. Most importantly though it seems as if the system could be
drawing in air. I replied to a post a couple of weeks ago explaining this.
The feed and expansion pipes should be fitted such that when the system is
running there is virtually no pressure difference between the two. If there
is, you could either get water pumping over if it has positive pressure or
sucking air in if it has negative pressure. You could try slowing the pump
down to its slowest setting. This often fixes the problem. If not you should
get it sorted as air in the sytem will corrode it much faster than having no
air. Actually, with no air it should last forever within reason. Its the
oxygen in the air that causes the black rust you often see in central
heating systems. There is a device available which traps air and sends it up
the vent pipe but the feed is also connected to it which ensures there is no
pressure differential between the feed and expansion. Have a look at:
BTW, You say it looks fairly new. Could this be that the problem has been
around for a while and this radiator has corroded to the point where it
started to leak and so a new one had to be fitted. Just a thought.
==================A loose nut can let air in and the degree of looseness may mean that
is a barely perceptible weeping which may evaporate alsmost as soon as it
A quick check on these nuts is certainly worthwhile if only as part of a
general search for the source of air intake.
Actually, leaks in heating systems, even when the water is under pressure,
will still suck in air. For a more detailed description, read
A vented system could be sucking air in through the expansion
pipe. OP hasn't said if system is sealed or vented.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.