Buzz from thermostatic mixer tap

[Willsy]

Hi, just want to make sure I'm going down the right route with this.
I've just installed a thermostatic mixer tap on my bath. When I tried it for the first time it buzzed (a fairly low buzz)
After a bit of research I found this could be caused by unequal pressure between HW and CW. I tested the pressures and the CW was a lot stronger.
Am I right in thinking the best fix for this is to install a non return valve on the HW only?

Cheers!

 

[Ben-gee]

No.
A pressure reducing valve on the cold would be better.