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i have tried the expansion vessel and water is spraying out as you suggest i may need to replace it is this expensive and is it possible i can purchase one and do the job myself or do i call in an expert :?:

my combi boiler (worcester 9.24 electronic) keeps losing pressure i have checked all related pipework and radiators for leaks but found none. while the system is running the outside overflow pipe has a steady drip/flow coming throught it. when the the system is started say for hot water it...