Fitting external expansion vessel.

Continually losing pressure.
Water from the air valve when depressed.
Boiler serviced annually over last 15 years.
Vaillant manual recommends 3 yearly check on air pressure.
I think 18 years is good going for a rubber membrane!

for such a smart guy you should know how to fit a external vessel!
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Just to close this off, external expansion vessel fitted today, managed to tee into return pipe. Pressure is now staying within normal levels between 1 and 1.5 bar.

It was a hell of a job fitting the compression fittings to the old lead pipe. (Dont panic, I'm only kidding!)

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