In article , Andrew Gabriel wrote:
I recall a few years back someone here had a condensing boiler
discharging condensate over their conservatory. At some point,
a 4' icicle came smashing through the conservatory roof.

AIUI that's why the current ones have a urinal style syphonic trap that
discharges a whole load of water in one go rather than a drip, drip,
drip which is liable to freeze up.

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Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk
Free SEDBUK boiler database browser http://www.sda.co.uk/qsedbuk.htm