insulating water pump

[ChrisR]

YOu should hardly be able to hear a smallish ST pump.
You don't want the pump bolted to anything light. Bolted to a paving slab which is on rubber means the pump has to move a large mass when it vibrates, so it doesn't move much at all, and there's very little to transmit down the pipes. I have put the paving slab on lengths of up-market pipe insulation.

ST say the flexy pipes should be dead straight, which seems stoopid to me because then there's no give. If they're slightly curved there's less noise. Plastic plumbing pipe is pretty good too!

First thing I'd try would be unclipping the pipes from the wall.

 

[kherbert]

ok, wil do, thanks ChrisR

 

[chrishutt]

You haven't said much about how the pump is installed. Does it have it's own dedicated supply from the DHW cylinder via a special flange or is the pump fitted to the existing hot supply pipe? If the latter it might be sucking in air which would make it much noisier.