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konastab01
It's often a warranty requirement of the cylinders I think - how on earth it got accepted as such by the manufacturers is beyond me - if they really don't want hard water going through the cylinder they should be mandating the installation of high flow water softeners, but they're bulky and have running costs people pretty much won't accept.
Given that the magnetic devices do naff all and peoples' cylinders don't seem to be getting clagged up with limescale I suspect it's not needed at all, but it's not like you get an inspection window to take a look at what's going on inside.
Anyway, unvented is amazing and I'm glad we have it too.