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If we need a new EV - How much are they ?

Which means a new expansion vessel ? or is it somehow possible to top up the air pressure ?

We have a 4 year old Worcester Greenstar 28i boiler that we tried the CH on for the first time this winter the night before last - it has been supplying hot water fine since fitting The pressure gauge rose up to 3.5 bar before I chicken out and killed it My questions are what is wrong with the...