Flue is discharging dirty water is this a blocked filter?

Flues discharge water in the form of condensation-therefore this water should be clean.
Dirty condensation water is a symptom of incomplete combustion in the boiler producing soot.
Get the burner serviced by an accredited person who can take and analyse the the flue gas output.
An efficient burner is a clean burner

Geoff
August 2012

Boiler is a Vokera Linea 28

Bill
July 2012