Viessmann Flue Gas Gasket DN60 7828645

The Viessmann 7828645 is a flue gas gasket with a DN60 nominal bore, used to seal the flue gas path on Vitodens gas boilers. It sits at the flue gas joint, where it prevents combustion products from escaping into the appliance casing or the room. The gasket is part of the flue gas circuit and should be renewed whenever the joint is broken.

• Visible cracking, hardening or flattening of the gasket at the flue gas joint
• Flue gas or combustion odour around the appliance or at the flue connection
• Combustion analysis readings that drift or fall outside the expected range
• Condensate weeping or staining at the flue gas joint
• The gasket is disturbed or the joint is opened during service

• Confirm the boiler model and serial number against the fitment list before ordering
• Check the existing gasket is marked DN60, as the bore size must match the flue gas connection
• Inspect the flue gas joint faces for corrosion or damage that would prevent the new gasket sealing
• Have the appliance recommissioned and combustion checked after fitting, as the flue gas path has been opened