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Many thanks to all, will be fixing the tap ASAP.

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...

The 30Ai "upgrade" is free, but I do worry the pipework will be an issue. For the 25Si, the installers toyed with the option of running pipes around the house, then had another look under the kitchen cupboards and decided only few smaller pipes need to be replaced. I wonder how much more...

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...