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How do you reduce The water pressure?

I would like to reduce the pressure in my Vaillant Eco Boiler
Jeremy, March 2012
Easiest safest way, is to bleed a radiator until the pressure is what you want. But do it when the system is cold, otherwise, when it cools down, the pressure will drop below required.

SD, March 2012
link Click here to see other fixes for Vaillant.