unvented cylinder

2 Dec 2015
Reaction score
United Kingdom
HELP I've got a unvented water cylinder, when i start to heat the water up it starts to leak water from the pressure relief valve on the multi bloc, if i turn on the hot water tap it stops. the water continue to heat to 60 degree with out it leaking ????
the vessel is new and so is the pressure/temperature relief valve ???
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Who thinks the installer was G3 qualified to install unventeds?
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