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have a look at this from todays newspaper.
http://www.dailymail.co.uk/sciencetech/article-1342357/Central-heating-break-big-freeze-Heres-.html
Why, if at all possible, can't the condensate lines be connected to the internal waste pipework via a tundish and 76mm deep seal trap thus eliminating freezing problems. I'm not sure if this is used in work practice. Then again, many heating installers are a little inexperinced when it comes to plumbing/above drainage systems.
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