Condensing Boiler - NO Condensate but BIG plume

QUESTION:

I have a natural gas condensing boiler (Ideal Minimiser SE80).
I have the boiler thermostat set near to its minimum to encourage condensing mode.
The boiler produces a realy big plume of water vapour but I have never noticed any water coming out of the condensate drain pipe.
There is, however, a constant drip from the tip of the flue.
Is this normal?

ANSWER:

I don't know about your specific model. However, many condensing boilers have a syphonic trap for the condensate. Rather than coming out as drips, about a litre or so will be released in one big hit. This helps prevent freezing of the pipes, as the quantity tepid water won't freeze on contact like the drips will. You might have a boiler with such a trap and might not have been watching when this rather infrequent event happens.


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