I don't think there would be any risk of pipes freezing in normal operation since they would have 80 degree water running through them all the time. The only risk would be a pump failure during very cold weather. Consider running two pumps to minimize that risk. Backup power supply might also be a good idea since power failures always happen when it is cold!
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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