My system is an open vented type fed by a Baxi Solo boiler. Once the hot water has been on for around 10 mins the vent pipe from the cylinder starts to bang and water starts splutterings into the feed tank causing a hell of a din (the kids thought we had a ghost in the loft!!) My wife is gettin well miffed!

Andy, January 2008

Your coil inside your cylinder could have scaled up.

Justin, January 2008