Towel radiator full of air?

[parapaul]

For some reason, the towel radiator in the bathroom needs bleeding every couple of days. None of the other 4 normal rads upstairs nor any of the downstairs ones have any problems, just this one. And it's quite a lot of air, too - maybe the top 6" of the radiator has no water circulating.

So I bleed it, all is well. But within 2 or 3 days it will need bleeding again.

Why, oh wise ones?

[Ferg]

It's that radiator because for whatever reason it's 'easier' for the air to separate into it.

Where that air is coming from is the question.
It may be a micro-leak on the suction side of the pump, but that's quite rare. Could be an automatic air-vent dropping when the pump fires and allowing a bit in. Most likely is that you have a lot of sludge in the system which is making hydrogen.

[redeye]

the towel rad is usually the highest in the house so air goes to the highest point ,dirty systems give of oxygen ,clean and treat the system, fernox is what you need