Bit of a specialist item this so I don't expect heat but it will help someone who has been in this situation or fallen foul of a callout charge from a boiler engineer.
I wish I had known about this years ago back when the weather was -25 and I had to cut the pipe and stick it in a bucket every couple of days, since then I have over insulated the pipe outside but the weather has never dropped low enough to freeze it again.
It will save you having to mop up a spill removing the condensate to stick it in a bucket to drain while the weather is bad, it will also get your boiler running again in seconds rather than pratting about trying to get the internal pipe into a bucket without splashing acidic water around.
Even if you can't fit it yourself you can have it ready should you have to call a boiler engineer and get him to fit it next time they have to come out (or at the annual service for a tenner cash in hand)
Yes I know it should drain internally to prevent this before it is posted but we didn't all have them fitted in a location to allow this, the people who owned my house before me didn't.Remember the water is acidic, take precautions and realistically this should be fitted by a professional as this is your gas central heating!
Can be ordered online and collected from store, it will probably be in the day before your folding bolt cutters arrive!