Vaillant Combi Boiler

Vaillant combi boiler models, guide, comparison, parts, manual, drawings, help

Water in Vent

How can I stop Rainwater ingress into my boilers horizontal vent which causes water to leak into my boiler?




Hi John,

I understand rain water ingress to be an issue with older vaillant flues.  They have developed a new flue terminal however it is not compatible with pre-ErP boilers.  Although the concentric flues pipes are similar Vaillant have changed the terminal design.  In summary you would need to replace a section of your old flue with that of the new design.

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