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Last winter, our radiators regularly lost their heat and consequently needed bleeding frequently. I couldn't see any obvious leak. What could be causing this and what should I check for?

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btw, checking for a leak is easy. Just add a little pressure to the system and see if stays for a few days. If it drops back to the level where the system opens the incoming valve you probably have a leak. –  Vitalik Jul 30 '10 at 3:06
    
@Vitalik, you can't add presure to a system that is not sealed, header tanks are sill in common use in the UK on older systems. –  Walker Dec 8 '11 at 10:50
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up vote 6 down vote accepted

I had this issue too. Bled the system once myself, twice with professional plumbers who kept telling me that i didn't do it correctly. Cost me an arm and a leg. The worst part was when i asked a "plumber with 25 years of experience" where the air is coming from he couldn't explain it. Some people were saying it's because i have an old type of expansion tank with the air, others were saying that the water from the city comes with some air.

What solved it is installing "Spirovent Air Eliminator". Not a sound this winter and i could finally sleep without hearing a waterfall.

P.S. Got a few more opinions on this forum

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