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Hello, just had a Worcester 30Si combi boiler installed and now one of the hot water taps developed a new problem. On the first twist - I get a bit of pressure, second twist - less pressure, third twist - loud disconcerting hammering, fourth turn - good pressure, no hammering. The problem...

Being in a need of a compact boiler, I ordered a Worcester 25Si for my 2 bed (6 radiator) house. However 30Si was delivered instead and re-ordering will delay installation and subsequent jobs. Can anyone voice an opinion on disadvantages of going with a more powerful boiler? 25Si and 30Si...