Try standing the pump on a congrete paving slab, and stand the paving slab on a thick block of foam rubber.
The extra mass of the concrete cuts down the magnitude of vibration / noise, and the foam cuts down the the noise transmission to the rest of the structure.
Thank you for all your replies. Much appreciated.
However, the soundproofing box at http://www.soundservice.co.uk/enclosure_kits.html may not be appropriate as I am unsure as to whether the Stuart-Turner Negative 3.00 bar hot/cold pump is air or water cooled and if only air cooled could burn it out as agile has mentioned.
Probably follow TicklyT's suggestion so many thanks to you.
You may find that most noise is transmitted as vibration via the pipe connections, both inlet and outlet, if the pump isn't isolated properly from the piping with flexible connections. Also if the pump is resting against the wall or floor with no insulation.
We suffered a very noisy pump in the flat next door until the pump died ( ) and was then replaced by the owner. This pump ran at any time of day or night when the water was used in the flat and was really annoying. I always knew when they were getting up in the morning and running a shower or even using the loo at night!
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