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Just to follow this up, turns out the valve was faulty - swapped for a new one and now both work silently.

When he checked it again he said he thought it was a lot noisier than to be expected and probably faulty. In what way? Is there something else you would recommend which would be more appropriate? Ha, I wish! Inner London, on a bus rote, under the Heathrow flight path...

I've checked the installation and made the adjustments as you suggested, my plumber checked it too, and it's still overly loud. Time to check with the retailer about returns... Thanks very much for your reply and advice.

Hi Read the forum loads in the past but first time posting... I've just had 2 Sunvic motorised zone valves fitted to control my new heating. One controls the under-floor in the living room, the other the rads in the rest of the house. The motors driving the valves to open / close make a...