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    Venting from a loft overflow Q.

    1) Boiler make / model (gas or oil) Gas - Myson Orion 2) What is / is not happening two tanks in the loft, a hot water tank in the airing cupboard & a boiler on the ground floor. one of the overflows for the tanks just drew my attention to the loft, so I went up to see if the ballvalves...
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