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We just installed a Grundfos STC-1.5 C twin impeller pump to provide the pressure required for high pressure bath taps. We’re suffering two problems: 1. First the pump is much noisier than I had expected, reading 82 decibels versus a claim of less than 70. 2. Despite taking separate...

OK, a bit of background first.. We're just in the process of putting a new bathroom in and want to get a bath tap with a deck-mounted retractable shower hose. The trouble is, we've only got 0.2 bar pressure (we've got roughly 2m of head to the bath tap) to play with and it's been hard to find...