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the whole reason i'm on this site is becouse i've had it up to here,with so called (CORGI REGISTERD) plumbers (givin' it all dat.!!) eather you know what the hissing noise is all about, or you don't

i live in a bungalow and have a vokera compact 24 combi boiler (not sure how old). the central heating seems to work fine, but when i turn on a hot water tap, the boiler starts making a loud hissing noise. the cold water pressure is fine but the hot water pressure is terrible ie 25 minutes to...