....get an expensive low pressure mixer as my combi boiler HW pressure isn't too great (CW is fine, 20ft of head).
In a combi the hot water pressure derives from the cold supply so get a mixer that is designed to work with a combi. 2/3 bar pressure is enough.
Just read the instructions before installing!! Good luck.
Thanks! The plumber briefly ran a tap & stopped the flow with his finger & said it was 'ok, but best get a low pressure mixer'. Most seem to work a minimum 1 bar, I'm sure i've got more than that!
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