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Flick the pressure vessel with your finger (not very technical, I know)
If the vessel sounds hollow, it won't need repressurising. Some vessels have to be mounted horizontally because of noise. Sometimes a non return valve letting by on a shower valve will cause hammering as well
@Liamw23 - you should really start a new thread and reference this one if you want suitable answers, it just confuses things resurrecting a 3 odd year old thread.
Ultimately get a G3/UVHW qualified engineer in to check it, unvented cylinders should be serviced yearly.
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