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I have just moved into a house with a Stuart Turner ST55 double ended shower pump in the airing cupboard. The shower is fantastic, but the pump is noisy enough to wake up the house when it is used for an early morning shower. I tried installing better flexible mounts to reduce mechanical vibration to the floorboads, which helped. It's still pretty loud though. The pump is installed correctly, with a Warix flange at the hot water tank, and a separate cold feed from from the CW tank in the loft. It is not cavitating. Anybody got any suggestions? I'd consider buying another pump if I could find a really quiet one.