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Air lock in hot water system

Postby wubba » Sun Oct 21, 2007 12:19 pm

I have a constant problem with air locks in my central heating hot water system. The hot water does not heat up because of the air lock and I have to keep going into the loft to release the air from the highest point, sometimes every week. I assume this is because the hot water feed is about three feet above the top of the cylinder before it gets back down to the cylinder. I do not have the same problem with the rads and the pipes take the same route. Should I fit an air purger to the highest point of the feed for the hot water or do I need to do something more drastic.
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Simply Build It

Postby muttley » Sat Oct 27, 2007 8:26 am

get a plumber in to check your system to be on the safe side
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Postby htg engineer » Sat Oct 27, 2007 10:45 am

You could fit an automatic air vent in place of the manual vent, but it shoudln't really be needed, and definately shouldn't need venting on a weekly basis.

From the boiler to the tank/cylinder the pipes should continually rise, there shouldn't be any fall or drop, if the pipes rise to the loft then drop to the tank/cylinder then thet's the problem. Get a plumber out to check and alter the pipework if necessary
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