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  • I have an Arston Microcombi 27 MFFI.
    I had an extension built with 3 additional radiators and a towel rail fitted.
    The boiler has since kept losing pressure (going from 1 bar to zero over 2 week periods) so I emptied some water from one of the radiators to act as an additional expansion vessel and now the boiler doesn't lose pressure.
    The exp vessel in the boiler holds 6 litres and is set to 1 bar pressure. If I buy a new exp vessel to fit externally does anyone know what size I need and should it still be charged to 1 bar pressure?
    If fit one externally should it go on the flow or return? The one currently in the boiler is in the return.
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