Dear All,

I have had a new boiler fitted last year (Vaillant TurboMAX 828E), and
with that a new Bathroom & Kitchen. Since the new items there's been a
'water hammer' problem that has been around, which has now caused me
to act!

I've got 2 ideas....1) Fit a Shock Arrestor or 2) Fit a PRV (Pressure
Reducing Valve). The mains pressure in the sealed system seems quite
high, and I'm guessing that I need to either reduce it (fit a PRV) or
fit the 'arrestor(s)'.

If I fit the 'arrestor' do I really need one for each tap where the
cold water is? Or can I fit it in a place where all taps/showers will
benefit? Bearing in mind that I cannot get access to the pipes for the
shower (concealed behind tiles into the wall), bathroom basin
(concealed behind tiles into wall with a non-pedestal type basin), the
only access to cold water is at the boiler and kitchen sink.

If I fit the PRV, I have no idea where to fit this, and help here
would be greatly appreciated.

Thanks in advance

Mika