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I Need the expansion vessel replacing on my Baxi 105E, the easiest option appears to have an external version fitted, Altecnic do an extensive range, but how do you calculate what size is needed,4, 8, 12ltr ???. Would it need its own filling loop, pressure release valve and pressure gauge or...

I have a Baxi 105e instant, noticed when the heating was on the pressure reached 3.0 Bar, then the relief valve opened and it dropped to 2.5Bar, it was suggested I repressurise the expansion vessel. So I set it to 1Bar and the operating pressure remained rock solid, and I observed it over the...