The expansion tank on my sealed system combi has failed (water comes out of the air Schrader valve when pressed). Also the pressure changes massively depending on temperature; classic symptoms.
So I have the choice of having an engineer change the boiler expansion tank , behind boiler so he'd probably have to remove boiler from manifold to get to it. £££+
Or I could fit another remote expansion tank at a much easier location (pro bably under floor boards).
Question is would it be okay to leave the u/s exp. tank connected to the sy stem as its now full of water? Are there any side effects of fitting anothe r exp. tank and keeping the old one connected?
Its a Worcester 24i Junior non-condensing boiler.
Thanks