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UPDATE: Just in case anyone's interested.... I did take pics, but have now solved the problem after taking advice from people here and then making one further adjustment; twas the room thermostat. Basically, it's been lying about its temperature, and reads several degrees below its...

Yes, that diagram more or less describes exactly what I have, without the higher loop of the vent pipe before it dips under the lid of the F&E tank. One other thing - my vent pipe drops into the tank the same side as the other feeds. That is to say, they are all on the same side of the tank...

JohnD Right, where to start? Photos can be provided tomorrow, but until then: The actual bend is about a foot above the current, reduced water level, curving up over the edge of the tank and then back down again along the side of the tank. The whole gubbins is in the loft about 2m above...

Hi there It was about 30mm above the water level when I started this topic, now it's more like 120mm after fitting my second new ball-valve (the first replacement could not fully shut off, which wasn't going to help long-term). Things are better now, but the odd drop of water still...

Thanks everyone. I feel more at ease now, and may get a "taller" F&E tank to stop water escaping (the lid clearly doesn't fit tightly enough...) BenH

OK - update: After reducing the water level in the expansion tank and bleeding the radiators (the CH pump was already on its lowest setting), my expansion pipe is STILL coughing out hot water quite fiercely. I discovered that having the lid on the tank actually made things worse - the...

Thanks Stem. It seems to me there's a five point check list here - I'm very open to correction... 1. Lower the ballcock and thus water level in the expansion tank to 3 or 4 inches, max, and ensure ballcock does not do the drip feed thing (I bet it is doing, may need a better valve). 2...

Of course. Thanks. That'll solve the overspilling - so do I need to worry about the coughing expansion pipe at all, then?

Wow. That's a lightning response, thank you! Namsag: the boiler stat may well be faulty - there's almost no friction when you turn it up or down, so I think it's set where it is... KevPlumb/ChrisR: Ah...so the water level is way too high as is? I take it it just has to cover the outflow...

Hi all - I'm hoping someone with superior knowledge to me can help... I have a gas fired open vented system with an expansion/header tank in the loft (Potterton boiler). My problem is that when the heating is on the expansion pipe intermittantly coughs hot water and steam into the CH tank...

Hi all Quick question about skylights. I have just bought a typical Edwardian/Victorian terrace with a lightbox over the stairs...but the skylight that once resided there has been removed. Could ahnyone tell me the rogh cost involved in getting someone to install a very basic window in this...