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Well, we didn't quite get around to checking all of our plumbing heat trace over the summer and we're paying the price now. A few weeks ago we replaced the ~40feet of output pipe from the STP because it was entirely blocked with ice. All of this at -40 in the dark. The bathroom sink hot water invariably freezes every night and must be thawed every morning. Finally, this last week, the entire toilet line froze. So it was a matter of thawing the contents, tearing out the old insulation, adding a functional heat trace, and replacing the insulation. Pretty awful. But we learned a lot about our house in the process!