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That's a thought; I'd just assumed it was air, but there probably is a fair bit of sludge in the system. I'll test the gas to see what it is (takes me back to testing for hydrogen at school!). Thanks also for the tip about the header - I'll try immersing the end of it in a tub of water and...

OK, here goes : :D 1.) It's an Ideal WRS 450 gas boiler 2.) Two things are happening - one is that air is being drawn into the system, the other is that the boiler appears to stop running even though the radiators aren't all that hot (hot at the tops of the rads, cool at the bottoms)...

Hi all, I have a couple of problems with my CH. The first is that I'm constantly needing to bleed off air from the top radiator in the house - at least once a day. The trouble is, I can't find where the air is getting in - there's no obvious sign of water getting out when the pump is off...