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wrote:
I am planning to install a Grundfos Alpha+ 15/60 variable speed pump in
a cupboard in my bedroom.

The pump is used to carry hot water (at 2.9 cubic metres per hour max.)
from a low loss heater to the heating circuits in my house and will be
on pretty much all the time.

Can anyone tell me how noisy this pump is? My only experience is with
shower pumps which seem to be very noisy. I'm worried that the Grundfos
pump might keep me awake at night.

Thanks,
Martin

It depends on the individual but I wouldn't have a pump in my bedroom
cupboard at all because I'm a very light sleeper. They all make some
noise. That transmitted through copper pipes seems to be the worst.
The CH type of pump though is much quieter than a shower pump.