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    Wider central heating pipes for new boiler?

    Thanks for all the replies! A quick update on the problem I was having with this boiler. Got a local independent heating engineer in to take a look because British Gas wanted to replace the boiler despite having a service contract with them. The independent engineer diagnosed that the problem...
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    Wider central heating pipes for new boiler?

    Thanks again for the replies guys! The model is Vaillant VCW-Sine 18 T3W. Yes, very old, but still going, except for the shower bit of course! We did think the issue was with the shower because we were getting hot water and central heating. As soon as any hot water tap is opened even slightly...
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    Wider central heating pipes for new boiler?

    Thanks very much for your post oldbuffer! The thermostatic mixer shower replaced an old electric shower recently when the whole bathroom was refurbished, so new pipes were installed for the mixer shower. We thought the new mixer shower could be faulty, and so exchanged it, but the same issue...
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    Wider central heating pipes for new boiler?

    Thank you very much for your posts Gas2Air, Dan_Robinson and GavThePlumber. I've got a flat in Liverpool. Just wanted to know if the work was necessary or totally out of the ordinary. Now I know it's recommended but perhaps not strictly essential (I presume boiler make and model dependent), I...
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    Wider central heating pipes for new boiler?

    Hello everyone! I'm new here and I was looking for some advice about a new boiler. At the moment I have an old Vaillant combi boiler which I'm told by an independent heating engineer, who I've always used, is over 20 years old. It's been fine for as long as I've remembered but recently I've...
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