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Loss of boiler pressure ?

My glowworm boiler looses its presure overnight. i have checked all joints and underfloor pipes and joints, and all radiators there is no water in the house anywhere. I checked the PR pipe outside the house and it was leaking, more so when the heating is off but still tricles when the heating is on. Is this the PRV?
Alec, October 2009
Yes it is - just one of the many leaky ones!

John, October 2009
link Click here to see other fixes for Glowworm.