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over pressure baxi 105e?

pressure valve lets go at 3 bar .loop disconected .but water is passing through to heating system and running out of by pass
paul laff, May 2008
Sounds like Diverter valve diaphram valve.
Passing between c/h and h/w supply.?
the 2 mixing. giving presure.
got to be the diverter valve.

Neil.Plumbing, May 2008
Could be domestic heat exchanger. If pinholed inside would pass mains to central heating.

Kevez, May 2008
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