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drip drip from safety valve on pressurised c/h system?

Steady drip fom safety valve pipe of home gas c/h system.Pressure reads 1 bar with boiler on.I'm more familiar with open vent systems but could the safety valve be faulty -do they go wrong?system 13 yrs old.Thanks.

Declan
January 2008
yes and yes, there only about £20

m.edwards
January 2008

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