I would at least blow out the lines and pour a little antifreeze in drain traps just to be safe. If you get temps in the 20's for several hours you could have damage. Might get by, but I would not chance it,especially on a brand new unit. If you blow the lines don't forget inside and outside shower. The water lines in the TT are pretty tough, but the faucets for showers are plastic and crack easily.
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