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Thanks to everyone for their advice, I have put together the following picture of a possible solution - raises two questions, see piccy. Any ideas? [/img]

thanks gas_man_gaz, did you post an image? I can see the IMG tag but no image

Its a potterton 24 HE, which I think already has an overheat stat - indeed in the manual a combined vent-feed is mentioned as an option

Thanks Tony, Do you know of any info online which gives guidance on converting my H to a combined with separator? Do I, for example, simply T the 15mm cold feed into the 22mm vent and then T the combined T into the main flow? Where best to site the separat.? cheers

Hi, thanks for the continued advice The vent pipe isn't dipping into the water - indeed if I get my wife to switch on and off the pump its only the cold feed that gets warm! Sorry gas_man_gaz, I meant to say two bottle air vents NOT seps. Where exactly on the H is the best place to fit a...

Thanks for the quick replies: The vent is already 20 inches above above cistern and the system has been flushed, twice at great expense. Plus there are two air seps either side of the 3 port valve. Still the hot water backs up the cold feed. Its almost as if the water is circulating and...

Hi, I have an ongoing problem of hot water seesawing into the header tank when the central heating pump is either switched on or off (not a problem whilst it is actually on!) This is causing a build up of sludge in the header tank which in turn is damaging the boiler heat exchange...