Hi,

Been looking at the Viessmann Vitodens Compact 100 manual. All condensate
drain configurations are shown terminating into an open outside gulley,
save for one, which is linked in with the rainwater downpipe.

Why can't the drain go into an internal pipe, say a run that serves a
washing machine for example, that then terminates into an internal soil
stack?

I thought about fumes leakage, but on example shows the boiler condensate
drain dropping into an open pipe which couples to a sink drain then leads
to an outside gulley. So that seems to contradict the fumes theory.

BCO mentioned he thought they could only go into a gulley - which got me
thinking...

Cheers

Tim