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my vokera 726 is losing water pressure when the central heating is turned?

what air pressure is required in the expansion vessel
mick, December 2009
The installation manual will tell you, however if you don't have it-look it up on Vokera website, free to download. This is a good idea anyway because its neccessary for service etc. Vessel presssure will propably be about 1bar/14.7psi.

Vincent, December 2009
link Click here to see other fixes for Vokera.