Hi, I have a Potterton Prima B system boiler. The hot water cylinder is the kind where it has the combined F+E on the top section of the cylinder and the cylinder has a small (o.5 litre) expansion vessel on it by the 2 port valve. However, the expansion vessel started leaking a year ago, I got a direct replacement and that only lasted a few months before leaking. I am wondering if the capacity is too small and the pressure is causing it to leak? Should I go for a larger vessel next time? Or maybe I am just unlucky and the vessels are not much good....
Thanks
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