reading posts about this pipe - I can guess it's designed to allow the H2O in the CH4+2O2 =CO2 +2H2O reaction to escape somewhere.
Never noticed one on my Vaillant 820 TurboMax boiler ... can they be internally fitted, or not always required ?
Having just thawed the cloakroom cistern supply pipe (it's right at the edge of the house) I'm worried.
Last night must have been cold. In the 8 years we've lived her, never had a bucked of water in the garage freeze.
Only condensing boilers need one, I don't know if that particulary boiler is a condensing boiler.
More info:
Yup, however it only applies to modern condensing boilers. Older non condensing ones have an exhaust temperature hot enough to ensure the H2O generated goes out the flue as steam along with the other combustion products.
Don't think that is a condenser is it?
The condensate drain is typically implemented in 20mm white plastic waste pipe (the stuff used on overflows etc), and would come out of the bottom of the boiler. If installed properly the concentric flue should be installed at a slight upward slope as it leaves the building - thus ensuring any gasses that condense to liquid in the flue, will flow back into the boiler.
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