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Heating system gurgles when starting up

Alun · 2012-01-13 14:32:16

For some time our gas central heating system has made what I can only describe as gurgling noises first thing in the morning when it comes on at 6am. It only lasts for a short while, maybe less than a minute, and then settles down and is quiet from then on. All radiators have been bled, the pressure is fine (1 bar when…

13-01-2012 2:32pm

#1

Alun

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For some time our gas central heating system has made what I can only describe as gurgling noises first thing in the morning when it comes on at 6am. It only lasts for a short while, maybe less than a minute, and then settles down and is quiet from then on. All radiators have been bled, the pressure is fine (1 bar when cold, 1.5 when hot) and the boiler has been regularly serviced. It's difficult to ascertain exactly where the noise is coming from, but our bedroom is next to the hot press and it appears to be coming from just above there.

Now, it's a bungalow, so I was wondering, seeing as this is the highest place in the system, whether in such a setup air could accumulate in the attic pipe work and whether there was usually any way to manually vent this or not? On the feed and return pipes in the attic going down to the hot press, there's something on each of the pipes that has always puzzled me (see photo) .. could this be something to so with it and if so how do they work?

EDIT: I should add there's a similar looking thing at the top of the boiler itself (see http://www.gasboilerparts.co.uk/timthumb.php?w=300&src=%2Fimages%2Fproducts%2FP+502040.JPG)

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