Hi

Awoke this morning to no heating due to frozen condensate pipe on new boiler
:-(
Boiler is in integral garage with no convenient internal drain, so
condensate pipe runs the length of the garage and exits through wall with
about 2" protruding over drain-pipe drain. Managed to pull about 18" slug of
ice out with help of hair drier and all was well.

So, what is the best way to prevent this in future? Pipe is about 20mm but I
dont really want to install a larger bore due to the need for a larger hole
through the wall. I'm in two minds about insulation - there's very little to
lag on the outside, but will lagging on the inside help or hinder? The
garage is pretty well insulated and never anywhere near freezing. I was
wondering about inserting a length of copper tubing or a metal rod up the
pipe with the idea that this would take some of the heat from the garage
into the final section of the pipe where the freezing is starting?

Thanks for any suggestions
Tom