Ginge wrote:

condensate pipe will flow through even ice. I have had that pipe
sticking out of the wall now for more years than I can remember and
never a drop.

Your not thinking of the emergency pressure release pipe by any chance
are you?

A condensate pipe would either give a steady stream of water when the
boiler is running, or "batches" of water delivered every so often if the
boiler had a syphonic trap



--
Cheers,

John.

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